The x, y, and z inputs represent where you want the base of the vector to be drawn and the u, v, and w inputs represent the three components of the vector. The general syntax to display the 3D plot is, plot3 (x,y,z) plot3 (x,y,z,Name) plot3 (x,y,z,LineSpec). Vocabulary (1:5000); V = word2vec (emb,words); size (V) ans = 1×2 5000 300. *exp (-X. Mesh Plot The mesh function creates a wireframe mesh. I have three vectors x,y,t. surfl (z) colormap (pink) % change color map shading interp % interpolate colors across lines and faces. Use scale = 0 to plot the vectors without the automatic scaling. To plot multiple sets of coordinates on the same set of axes, specify at least one of X, Y, or Z as a matrix and the others as vectors. I am looking to plot 3 vectors with x,y,z components. Hi, I am looking to plot 3 vectors with x,y,z components. To plot a set of coordinates connected by line segments, specify X, Y, and Z as vectors of the same length. I have 3 parameter. First, create. Learn more about meshgrid, 3d plot, plotting MATLAB. plotv will be removed. plot() and plots lines and p oin ts in 3-D. You can represent data that is in vector form using various MATLAB graph types, such as surf, contour, and stem3, by first restructuring the data. Your code only provides the z values of the points on the diagonal line x = y. I need to plot data were I can see that when x was 10 that y and z were some values. Answers (1) This vector field has all vectors pointing toward x-axis, and the length of vectors is only a function of y. I am trying to neatly plot the angle between vectors in 3D plots/figures as arcs with their respective angle. This is a guide to 3D Plots in Matlab. I have tried the quiver function . However, one option could be to plot a sub-selection of t against Y, something like this (using the values from your example): plot (t, X, t (3:3:15), Y) Of course this assumes that your values are actually spaced like your example. ^2 - Y. 51 -0. plot3( X , Y , Z ) plots coordinates in 3-D . plot (X,Y) creates a 2-D line plot of the data in Y versus the corresponding values in X. MATLAB will execute the above statement and return the following result −. MATLAB allows creating two types of vectors −. Then you can pass that along with the coordinate vectors to trisurf. I am trying to create a program that can import an excel file of 3 columns with the vector data, and display these vectors into a 3d graph. Example \(\PageIndex{2}\) mesh() 3D Plot %% Create a 3D graph of r^2 = x^2 + y^2 over a grid of points % 1. A scalar consists of only magnitude, but a vector contains magnitude and direction. Given three vectors x,y,z. Select a Web Site. This site allow users to input a Math problem and receive step-by-step instructions on How to plot 3d vector field in matlab. then be just the line generated by that vector. For example, the origin is located at a point where. Use them to calculate z. How to draw vectors physical 2D 3D vectors in. Project filled contour onto a graph. 3D Vector Plotter. y1 y2]; plotv (M) You can find the documentation at the MATLAB plotv page. Would it also be possible to have the cone 50% transparent? Right now I'm drawing a basic 3d environment using the surf function. % INPUT: % x - array, x components of initial points. Can you guys help me?. How to plot 3d vector field in matlab. 1K subscribers Join Subscribe 150K views 4 years ago Working with Matlab This tutorial illustrates how to generate 2D plots in Matlab. geoplot3 (g,lat,lon,h) plots a 3-D line in the geographic globe specified by g at the vertices specified by lat, lon, and h. Vocabulary (1:5000); V = word2vec (emb,words); size (V) ans = 1×2 5000 300. Property/value pairs are passed to patch. I don't have any origin or any end pont. A 3D hexagon is called a hexagonal prism. Plot 3-D Helix. Our inputs A, b & c are then passed as arguments to our function. coneplot allows you to specify locations of the vectors (in the form of cones). I have 3 parameter. geoplot3 ( ___,LineSpec) sets the line style, marker, and color. A hexagonal prism is classified as an octahedron, which is a three-dimensional geometric object with eight faces. Project filled contour onto a graph. If we want to create a 3D scatter plot, we can use the scatter3() function. The vectors X, Y, and Z represent the location of the base of each arrow, and U, V, and W represent the directional components of each arrow. Find the treasures in MATLAB Central and discover how. Hi, I am looking to plot 3 vectors with x,y,z components. To plot multiple sets of coordinates on the same set of axes, specify at least one of X, Y, or Z as a matrix and the others as vectors. 0 Matlab: 3D Surface Plot of values from own vectors. You cannot define contours using isolated Z values at (X,Y) points on the grid (i. 2D refers to objects or images that show only two dimensions; 3D refers to those that show three dimensions. I need to 3D plot them. Mesh Plot The mesh function creates a wireframe mesh. Plot the vector field together with the contour plot of the potential. To add plots to an existing figure, use hold on. To plot a set of coordinates connected by line segments, specify X, Y, and Z as vectors of the same length. For smoother color transitions, use a colormap with linear intensity variation such as pink. The function in matlab is called Tri=delauny (X,Y,Z). Thank you for answering 168. Output: Check this link for more details about the mesh() function. Now we will create a 3-D surface plot by using function surf (X, Y, Z). Use plot instead. Learn more about vector, plot, 3d plots. Matlab 3d plot of 3 vectors. Use EdgeLabel to label the edges using the edge weights. The plot3 function is used for 3D line plots. This function is the same as the scatter() function, though it plots the given data in a 3D plane. Sign in to answer this question. t = linspace (0,10*pi,200); x = sin (t); y = cos (t); z = t; line (x,y,z) view (3) Plot Line Using Low-Level Syntax Try. The quiver3 takes 6 parameters, x, y, z and u, v, w. Your function is f(x)=(x,2y2,3z3) so ∇f(x)=(1,4y,9z2). Use the (X, Y) values to define the coordinates in an x-y plane at which there is a Z value. You can also display vectors along a horizontal axis or from the origin. May I know what matlab function I can used to achieve this? I have tried quiver3 before, but it is too messy to interpret the plot. The vectors X, Y, and Z represent the location of the base of each arrow, and U, V, and W represent the directional components of each arrow. Use the scatter3() Function to Create a 3D Scatter Plot in MATLAB. The plot function offers greater flexibility over figure properties and is consistent with other MATLAB ® plotting functions. Make wire-framed surfaces 3D] 3D surface plots [MATLAB: surf, shading, surfc, surfl, surfnorm,. scale = 2 doubles their relative length, and scale = 0. plot3 (X,Y,Z) plots coordinates in 3-D space. I want to plot it in 3D. x = linspace (-10, 10, 100); y = linspace (-0. surfl (z) colormap (pink) % change color map shading interp % interpolate colors across lines and faces. To get the same figure orientation in MATLAB as in your Lumerical plots, you will need to define a uniform grid for the spatial vectors, x, y, z. Use plots to visualize data. MATLAB 3D plot is a graphical tool that allows us to visualize data in three dimensions. Accepted Answer. To use the same interval for both x and y , specify xyinterval as a two-element vector of the form [min max]. Accepted Answer: Walter Roberson. mesh() needs your points to be on a mesh (because that's what it does -- create a mesh plot). Product Updates Creating 3-D Plots This example shows how to create a variety of 3-D plots in MATLAB®. Use the scatter3() Function to Create a 3D Scatter Plot in MATLAB. Matlab 3d plot of 3 vectors. Matlab 3-D Plot. plot3 (X,Y,Z,LineSpec) creates the plot using. Unlike the surf function, the primitive surface function does not call newplot before plotting and. The polygon has no isolated points or edges, nor does it have dangling edges. 21 серп. The x, y, and z inputs represent where you want the base of the vector to be drawn and the u, v, and w inputs represent the three components of the vector. plot3 (X,Y,Z,LineSpec) creates the plot using. Edit1: I use MuPad to render my drawing, I suppose to draw the arc between two vectors by plot::Arc3d (1, [0,0,0], n, al. Use plot instead. The fact is that I want to create a 3d trayectory, plotting the gathered orientation (roll, pitch, yaw) and traslation of each iteration. Optional 3rd argument: User may also specify a string that determines the plot style of the plane, using the same string options as for MATLAB's plot function. For example, let M be a matrix containing three 2-element vectors. corrplot returns the correlation matrix and corresponding matrix of p -values in tables R and PValue, respectively. As a part of this tutorial about MATLAB 3D plot examples, I am describing the topmost five 3D plots one-by-one. Hi, I am looking to plot 3 vectors with x,y,z components. %Question: for the given initail state vectors: Plot the magnitude of the position vector versus time [x axis: Time (hours) – y axis: radius (km)] % Plot the magnitude of the velocity vector versus time [x axis: Time (hours) – y axis: velocity (km/s)] % Plot the orbit in 3D including a suitably dimensioned sphere for. If, however, you wish to plot only the points, you may use a scatter plot. I have tried the quiver function but havent had any luck. To plot multiple sets of coordinates on the same set of axes, specify at least one of X, Y , or Z as a matrix. Now you wish to plot each of these 'n' sets with the. You can then determine the variance along each of those vectors and plot an ellipsoid which represents sort of a confidence region. Here's my code so far. Plotting orbit in 3D. projectedPoint=dot (P-P0,D/norm (D))*D+P0. Plot Vectors 3D Follow 154 views (last 30 days) Show older comments Kaden on 21 Aug 2018 0 Commented: Kaden on 22 Aug 2018 Accepted Answer: Walter Roberson Hi, I am looking to plot 3 vectors with x,y,z components. Vector and Matrix Data. Plotting 3D for three independent variables without any function. Create a 3-D quiver plot of the subset you selected. Description Vector and Matrix Data example plot3 (X,Y,Z) plots coordinates in 3-D space. Surface Plot (with Shading) The surfl function creates a surface plot with colormap-based lighting. You also need to consider the x and y grid to plot it properly. Specifically the angles between the x, y, and z-axis and Resultant. plot3 (X,Y,Z) plots coordinates in 3-D space. surf (Z,C) additionally specifies the surface color. Vector and Matrix Data. will be removed in a future release. We could also plot 3D scatter plot using scatter function. Spherical coordinates and plotting in MATLAB RobertTalbertPhD 18. How can I go about plotting these vectors on the same plot?. I am trying to create a program that can import an excel file of 3 columns with the vector data, and display these vectors into a 3d graph. with x,y, and z axes), but I don't believe that there is a way to get matplotlib to apply a 3D effect to arrows over a 2D plane. 2K subscribers 74K views 12 years ago MATLAB in multivariable calculus Overview of working with. Using plot3 to plot 3d vectors. Plot contour (level) curves in 3D. 2D and 3D axes in same figure. surface (X,Y,Z) creates a primitive, three-dimensional surface plot. Let us say the size of each is 1x10. For example, the origin is located at a point where neither x nor y nor z appear to be 0 although the same is not true for the remaining points on the plot (like (-3,6,-3) and (4,5,6)) and the location of points relative to each other seems correct. 3D Vector Plotter. The data generated by this function can be shown with either trimesh (Tri,X,Y,Z) or trisurf (Tri,X,Y,Z). I have calculated matrix z that is 21 x 101. Sign in to answer this question. Creating 3-D Plots This example shows how to create a variety of 3-D plots in MATLAB®. I have saved all the orientation data in a matrix of "m" x 3 size, where "m" is the number of the samples of the measurement over the time: Theme. surf (Z) creates a surface plot and uses the column and row indices of the elements in Z as the x - and y -coordinates. Next, we will define B as the cos function of values of A. The result will be an m*n by 3 matrix. For adding labels use text. Project contour profiles onto a graph. I don't have any origin or any end pont. I'm trying to use the function plot3 to draw a cone with specific dimensions at a specific location. The x, y, and z inputs. The x, y, and z inputs represent where you want the base of the vector to be drawn and the u, v, and. % Create a 3D line plot x = linspace(0, 10, 100); y = sin( x); z = cos( x); plot3( x, y, z); 📌. Stream plots (stream lines, ribbons, tubes, and cones or arrows) illustrate the flow of a 3-D vector field. Using plot3 to plot 3d vectors. Creating 3-D Plots This example shows how to create a variety of 3-D plots in MATLAB®. The x, y variables are used to give the values for z, ( z=f (x, y)). Surface plots need 2-dimensional grids of x and y coordinates. I think what you are looking for is pca , it would give you the three vectors corresponding to maximum variance in your 3D scatter plot. You can then determine the variance along each of those vectors and plot an ellipsoid which represents sort of a confidence region. Change Line Properties and Display Markers. For smoother color transitions, use a colormap with linear intensity variation such as pink. For example, let M be a matrix containing three 2-element vectors. ) The goal for me was to draw some reference frames to illustrate coordinate systems. Here are a few functions that will get you going in the right direction: For drawing vectors in 3D, you'll probably want to use quiver3. ^2); % dot. Matlab 3d plot of 3 vectors. Live Demo r = [7 8 9 10 11] MATLAB will execute the above statement and return the following result − r = 7 8 9 10. To plot a set of coordinates connected by line segments, specify X, Y, and Z as vectors of the same length. I have calculated matrix z that is 21 x 101. I am looking to plot 3 vectors with x,y,z components. 3 Answers Sorted by: 3 If you intend to plot them as vectors from the origin, MATLAB's plotv function (which comes with the Neural Network toolbox) allows you to. The video describes what a vector is, three different ways to make vectors, and how vectors are used in MATLAB through. Next, we will define B as the cos function of values of A. Parametric curve. geoplot3 ( ___,LineSpec) sets the line style, marker, and color. The function can plot both 2D and 3D vector with arrow depending on the dimension of the input. Or use scatteredInterpolant or griddata to interpolate onto a grid. You have to have derivatives of your components as well, but you can calculate them easily enough once you know how you want to take the derivatives. Matlab 3d plot of 3 vectors. Thank you for your answer, I uploaded my data on Matlab but I failed to plot it. Define t as a vector of values between 0 and 10π. 205K views 4 years ago Working with Matlab This tutorial illustrates how to generate 3D plots in Matlab. do not evaluate to real numbers. Now you wish to plot each of these 'n' sets with the. Plot vectors that are normal to the surface defined by the function z = x e - x 2 - y 2. In a matrix, the two dimensions are represented by rows and columns. I have four vectors as attached in Data_1. Thank you for answering 168. One type of 3-D plot that may be useful is a surface plot, which requires you to generate some kind of x-y plane and then apply a 3rd function as the z dimension. We can give two or three input vectors to the scatter3() function. Visualize the word embedding by creating a 2-D text scatter plot using tsne and textscatter. Modified 7 years, 8 months ago. Accepted Answer. plot3 (X,Y,Z,LineSpec) creates the plot using. Use plots to visualize data. I have tried the quiver function but havent had any luck. 5, 0. The x, y variables are used to give the values for z, ( z=f (x, y)). Specify the axes as the first input argument. To plot a set of coordinates connected by line segments, specify X, Y, and Z as vectors of the same length. For drawing straight lines and arcs use line. Learn more about vector, plot, 3d plots. So at the point (0, 0, 0), Var=1. Here are a few functions that will get you going in the right direction: For drawing vectors in 3D, you'll probably want to use quiver3. There are several differences between these functions that require updates to your code. plot3 (X,Y,Z) plots coordinates in 3-D space. The syntax is straightforward: plot3 (x,y,z). I have four vectors as attached in Data_1. To add plots to an existing figure, use hold on. then be just the line generated by that vector. If that is not the case, you should give more information about how you ended up with two vectors of different lengths and the relationship between t (idx) and y (idx) for a given idx. This is for projection in the Euclidean 2D plane. Plot 3D vectors/arrow (again. plot() and plots lines and p oin ts in 3-D. geoplot3 (g,lat,lon,h) plots a 3-D line in the geographic globe specified by g at the vertices specified by lat, lon, and h. plot3 not functioning. 51 -0. Answers (1) You can use the scatter3 (x,y,z) function to plot these points as a scatter plot. ^2); % dot. Embed the word vectors in two-dimensional space using tsne. 3D errorbars. Plotting a normal vector to a plane in matlab. In the plot generated, the location of some points does not appear to correspond to the axis numbers. Plotting the matrices gives a surface / mesh plot: If you only want a 3D line plot, check out the plot3() function. I have tried the quiver function but havent had any luck. A contour plot is also called a line plot. This MATLAB function plots arrows with directional components U, V, and W at the Cartesian coordinates specified by X, Y, and Z. – Ben Grossmann. Once you have the data file available, you can use the plot3. Discussions (24) %quiverC3D creates a 3D quiver plot and adds a color coding. %given by the magnitudes of the component vectors. I have tried the quiver function . Learn more about vector, plot, 3d plots. First, create. t = linspace (beginningtime,endingtime,length (y)); plot (t,y) This assumes the y data was sampled at equal time spacings. If you intend to plot them as vectors from the origin, MATLAB's plotv function (which comes with the Neural Network toolbox) allows you to do just that. geoplot3 ( ___,Name,Value) specifies additional options for the line using one or more name-value pair arguments. rapelustcon, download from site video
Example: clear all close all [x,y] = meshgrid([-2:. . Plot 3d vectors matlab
Sorry for misunderstanding , i have already 3-d data calculated , i don't want to calculate the 3rd coordinate based on the (x,y) data. ^2 - Y. I am trying to create a program that can import an excel file of 3 columns with the vector data, and display these vectors into a 3d graph. Label requirements: 1. Hi, I am looking to plot 3 vectors with x,y,z components. Display contour lines and gradient vectors on the same plot. Project contour profiles onto a graph. For example, the origin is located at a point where neither x nor y nor z appear to be 0 although the same is not true for the remaining points on the plot (like (-3,6,-3) and (4,5,6)) and the location of points relative to each other seems correct. Automatic text offsetting. However, they can be portrayed in images and art. Then, find the gradient of z by specifying the spacing between points. plot3 (X,Y,Z,LineSpec) creates the plot using. Answers (1) Patrick Kalita on 8 Mar 2012 You're asking quite a lot there. 22 0. Surface Plot (with Shading) The surfl function creates a surface plot with colormap-based lighting. To plot multiple sets of coordinates on the same set of axes, specify at least one of X, Y, or Z as a matrix and the others as vectors. Hi, I am looking to plot 3 vectors with x,y,z components. I want to plot a 3D surface , but I cannot apply the surf () command straightforwardly for some reason. Filled contours. A scalar consists of only magnitude, but a vector contains magnitude and direction. I'm having some issues with 3D vector plotting an electric field assoicated with a charge over some range (picture attached) This is what i have thus far: Theme. I want to plot a 3D surface , but I cannot apply the surf () command straightforwardly for some reason. Let us say the size of each is 1x10. coneplot allows you to specify locations of the vectors (in the form of cones). Product Updates Creating 3-D Plots This example shows how to create a variety of 3-D plots in MATLAB®. The x, y, and z inputs represent where you want the base of the vector to be drawn and the u, v, and w inputs represent the three components of the vector. I then made linear algebra work on it to project it onto a plane with normal vector N = [1,2,3]and got the values for the 3D matrix (x,y,z). Choose a web site to get translated content where available and see local events and offers. 1 Graph of sin (x) Having variables assigned in the Workspace, x and y=sin (x) in our case, we can also select x and y, and right click on the selected variables. Contour plots are used to show 3D surfaces by plotting z- slides on a 2D surface. I have 4 row vectors x, y, z and s, all of them have equal sizes 1*size. 3D plotting lets us see the relationship between three variables in a three-dimensional space. Find the treasures in MATLAB Central and discover how the. The x and y variables are usually in a grid called meshgrid. Use the quiver3 function to plot the vectors and the surf function to plot the surface. You also need to consider the x and y grid to plot it properly. Define st and ct as vectors of sine and cosine . corrplot returns the correlation matrix and corresponding matrix of p -values in tables R and PValue, respectively. Type in the following statement at the MATLAB prompt: x= [-pi:. I have tried the quiver function but havent had any luck. To plot a set of coordinates connected by line segments, specify X, Y, and Z as vectors of the same length. 1/ 'deformation' problemns when applying functions like 'axis equal' when different objects are present, 2/ color. Learn more about image analysis, plot, 3d plots MATLAB Hi everyone! I need to create a 2D plot where the elements that are at z = 1 must be at the same level of the elements at x and y but these elements along z must be highlighted against the backgrou. Make wire-framed surfaces 3D] 3D surface plots [MATLAB: surf, shading, surfc, surfl, surfnorm,. One type of 3-D plot that may be useful is a surface plot, which requires you to generate some kind of x-y plane and then apply a 3rd function as the z dimension. The function delaunay will work fine. Plot Vectors 3D. To plot a set of coordinates connected by line segments, specify X and Y as vectors of the same length. Surface Plot (with Shading) The surfl function creates a surface plot with colormap-based lighting. You should set the 'Renderer' property of the figure to 'painters': peaks set (gcf, 'Renderer', 'painters') print (gcf, '-depsc', 'test. A scalar consists of only magnitude, but a vector contains magnitude and direction. I am trying to neatly plot the angle between vectors in 3D plots/figures as arcs with their respective angle. 2 Plotting a 3D data in Matlab. Error, SNR, Weights 1. 1 I have an image (mat file) and can access it as a 2D matrix 2*10095. C/C++ Code Generation Generate C and C++ code using MATLAB® Coder™. To plot multiple sets of coordinates on the same set of axes, specify at least one of X , Y , or Z as a matrix and the others as vectors. For example, read patients. Define Shallow Neural Network Architectures. plot 2 3D vectors in Matlab. First, create. First, we will define ‘A’ as a vector containing values between pi (π) and 3π. VectorPlot3D by default shows vectors from the vector field at a specified grid of 3D positions. I got this vector V in this way: Using two 3D point (for example A and B) I get the vector v=A-B then the unit vector V= (A-B)/norm (A-B) So If I want to plot V, without A. How can I go about plotting these vectors on the same plot?. You can also display vectors along a horizontal axis or from the origin. Hi, I am looking to plot 3 vectors with x,y,z components. 5 halves them. Lorenz attractor. Display contour lines and gradient vectors on the same plot. Contour plots are used to show 3D surfaces by plotting z- slides on a 2D surface. mesh() needs your points to be on a mesh (because that's what it does -- create a mesh plot). The projected point is given by, Theme. Other commands a v ailable for 3-D graphics are: p color. Vector and Matrix Data. So you can't express things like the x=0 plane. The function delaunay will work fine. 21 серп. Type in the following statement at the MATLAB prompt: x= [-pi:. You are using hold on before you do any 3d plotting so the 2d view is the one held. I need to plot data were I can see that when x was 10 that y and z were some values. This function is the same as the scatter() function, though it plots the given data in a 3D plane. The following code is meant to plot the vectors (4,5,6), (-3,6,-3) and (1,2,3) directed from the origin. C/C++ Code Generation Generate C and C++ code using MATLAB® Coder™. for example V= [0. Specify the axes as the first input argument. Learn more about image analysis, plot, 3d plots MATLAB Hi everyone! I need to create a 2D plot where the elements that are at z = 1 must be at the same level of the elements at x and y but these elements along z must be highlighted against the backgrou. 7 0. m t = linspace(0,10* . Surface Plot (with Shading) The surfl function creates a surface plot with colormap-based lighting. will be removed in a future release. I have saved all the orientation data in a matrix of "m" x 3 size, where "m" is the number of the samples of the measurement over the time: Theme. I am looking to plot 3 vectors with x,y,z components. Type in the following statement at the MATLAB prompt: x= [-pi:. Velocity Plot (Cone Plot) In such situations, there's a different function called coneplot that you can use. V is a matrix of word vectors of length 300. Sorry for misunderstanding , i have already 3-d data calculated , i don't want to calculate the 3rd coordinate based on the (x,y) data. Surface Plot with 3 vectors. The polygon has no isolated points or edges, nor does it have dangling edges. The block accepts vector magnitudes and their angles (in radians, per-unit. The polyhedron has the previously stated polygon traits, but it additionally does not have isolated faces or dangling faces. Thank you for answering 168. 5, 100); To calzulate I have to call some function which works only for fixed values of. The column and row indices of Z are the x and y coordinates in the plane, respectively. I have tried the quiver function but havent had any luck. Answers (1) You can use the scatter3 (x,y,z) function to plot these points as a scatter plot. Engineers and scientists use this tool to create models and simulations. Answers (1) You can use the scatter3 (x,y,z) function to plot these points as a scatter plot. Can you guys help me?. As long as you download the. Try to rotate the above figure, and get a 3D view of the plot. 2D and 3D axes in same figure. ,scale) automatically scales the vectors to prevent them from overlapping, and then multiplies them by scale. Here's my code so far. Spherical coordinates and plotting in MATLAB RobertTalbertPhD 18. 5; %initial x position. To plot one set of coordinates, specify X , Y, and Z as vectors of equal length. just the direction cosine. contour3 (Z) creates a 3-D contour plot containing the isolines of matrix Z, where Z contains height values on the x - y plane. Here are a few functions that will get you going in the right direction: For drawing vectors in 3D, you'll probably want to use quiver3. will be removed in a future release. However, I would recommend to export you figures as pdf, since I believe that latex will convert eps to pdf anyway. Viewed 156k times. Or use triangulation based tools like delaunay to trinagulate the set in the (x,y) plane, then use trisurf. Then, find the gradient of z by specifying the spacing between points. ,'FileName',file) : string arry with name of. . black stockings porn