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How can I plot a mesh, surface or a contour from discrete vector data ?
If your data is in vector form use griddata to create 3D array x = linspace(min(X0(:)), max(X0(:)), 50); y = linspace(min(Y0(:...

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Scaling of intensity value of captured jpg image
I'm not familiar with DICOM images but looks simple: I1 = imread('3.jpg'); I2 = rgb2gray(I1); I3 = I2-min(I2); ...

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Generation of similar vectors
What about interp1()? load data.mat y = data; x = 1:length(y); x1 = linspace(x(1),x(end),1000); y1 = interp1(x,y,x1); ...

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How to use fillup3 to color shape?
One aproach p=[11,10,16]; q=[11,10,18]; r=[15,9,18]; M=[p;q;p;r;q;r]; i = randi(6,1,6); % mix indices cm = jet(6);...

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Is there a way to mark a certain point a 3D plot plotted by the mesh function?
Yes. THere are a few methods: plot3(), scatter3()

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How can I add a diagonal gradient and corresponding colorbar to a plot?
An example: [X,Y] = meshgrid(1:0.1:3); Z = X+Y; pcolor(X,Y,Z) shading interp colorbar('Location','NorthOutside') You can a...

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Plot 3D matrix with complex values
Try pcolor pcolor(A(:,1,:)) % display first matrix

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How to draw circle in a 3D space?
Another version Rotation matrix from HERE

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Scaling color with selected axis data
Why not use surf()? Color lines using patch() clc,clear % parameters x= [0:1:30]' ; y= linspace(0.1,10,length(x)) ; [X,Y...

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Variable cannot be overwritten in an if loop
Just remove

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plot volumetric spherical coordinate data
Use isosurface to plot data at specific value example clc,clear % generate some data theta1 = linspace(-1,1,60)*pi; p...

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How to calculate left ventricle ejection fraction?
There is an example with using impoly I = imread('img1.png'); imshow(I) h = impoly; % draw polygon msk = h.c...

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How to compute equation only for x(y>0)
Take Ew where Pw>0 Ew = (1369*((alphaa*x)+(alphar.*y)+(alphai*z)))/1000 % alphaa and alphai are constants. alphar is only one d...

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How to make a scatter plot of a 2D field in a map and add contour lines of a different field in the same map, without the contour command messing up with the color scale of the scatter command?
Max value of batim is 1000, so MATLAB automaticaly rescale color range for [0 1000] try set(gca,'Clim',[0 30])

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How to plot in for loop?
You re comparing wrong variable if i<18.5 % maybe bmi(i) < 18.5 Forgot hold on hold on You draw all data together ins...

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Solution of non linear equation
Maybe there is no such a and c! I used isosurface to create several combinations: clc,clear cla [a,c,y] = meshgrid(0:0.5:5)...

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plotting a volume data in x and y plane
Use volumeslice() or contourslice()

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Surf plot with a mask
Use CData property: [X,Y] = meshgrid(-5:5); Z = -X.^2-Y.^2; C = rand(size(Z)); surf(X,Y,Z,'Cdata',C)

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help me to write a code for processing an audio signal using taylor series
Try gradient instead of diff dx = gradient(x); dx2 = gradient(dx); result = x + (h.*dx) + (h^2.*dx2)./factorial(2);

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How to find the distances between two points in X-Y plane?
Use euclidean distance d = sqrt( (x2-x1).^2 + (y2-y1).^2 );

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How to make the binarized image clearer
Pay attention that you don't extract colormap This only extracts indexed image (see workspace, I is of size [369x574x1]) I = i...

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Drawing lines like streamslice
Explanations: result See attached script

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I need help with plotting streamlines and velocity field
Use gradient() and streamline()

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How can I intersect a line and a 3D object (cube, sphere, prism)?
It is a pyramid. If you want to know if line intersects pyramid you should inspect each plane of it Once you have all interse...

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Full fill a rectangle shape in an image
Use convhull or boundary to get contour of your figure Then use inpolygon to fill this shape

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Do the isosurfaces merely indicate a single value or do they contain information on all the value above the threshold?
You should plot multiple isosurfaces since isovalue should be a scalar YOu can use for loop for that purpose

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How to color the area between lines that are vectors, no functions
I created some figure and lines I rotated lines and created new figure (yellow) Painted faces to white and removed edg...

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Setting the distance between 2 lines?
What about for loop? width = 10; dist = 10; x0 = 0; hold on for i = 1:4 xline(x0+(width+dist)*i,'Linewidth',width) en...

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color intensity showing z values
You should use griddata() and pcolor()

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How can I Write a program that determines how many real roots are expected out of the quadratic equation (ax2 + bx+ c = 0) with corresponding inputs. When a user runs the file it should ask for the values of the constants a, b, and c.
I made a printscreen for you From this page: LINK Look carefully on your if statement

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