MATLAB: How to plot 4D contourf for the matrix C(4040) with respect to A(4040) as x axis and B(40*40) as y axis for different levels z=1000, 800, 600, 400 in one plot

4 dimensioncontourmatrix

Dear Sir I have three matrices A,B and C having same size 40*40. I want to plot a contour of C(40*40) taking A(40*40) as x axis and B(40*40) as y axis for different levels z=1000, 800, 600, 400 in one plot. Please help.

Best Answer

If your X and Y data are sorted in a good grid, then

contourf(X, Y, C, [400, 600, 800, 1000])

If your X and Y are not sortable to a good grid then you will need to do some grid interpolation and contour that.

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MATLAB: How to use scatter with transparent dots

MarkerFaceAlpha and MarkerEdgeAlpha are what you're looking for. Check out this example.

https://www.mathworks.com/examples/matlab/mw/graphics-ex36949892-create-scatter-chart-with-transparency

[from the link]

x = [5 10 11 13 18];
y1 = [40 80 150 80 50];
a1 = 100*[100 50 80 30 50];
scatter(x,y1,a1,'MarkerFaceColor','b','MarkerEdgeColor','b',...
    'MarkerFaceAlpha',.2,'MarkerEdgeAlpha',.2)
axis([0 20 0 200])
x = [2 6 8 11 13];
y2 = [30 40 100 60 140];
a2 = 100*[30 50 30 80 80];
hold on
scatter(x,y2,a2,'MarkerFaceColor','r','MarkerEdgeColor','r',...
    'MarkerFaceAlpha',.2,'MarkerEdgeAlpha',.2)
hold off

MATLAB: How to find/plot histogram of a matrix i.e A=[10 20 30 40;40 40 128 40;128 0 0 0;0 1 2 5];

Do you have problems with teh posted code?

I do not have the Image Processing Toolbox for imhist, therefore I'd try:

histogram(A(:), 10)

Best Answer

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MATLAB: How to use scatter with transparent dots

MATLAB: How to find/plot histogram of a matrix i.e A=[10 20 30 40;40 40 128 40;128 0 0 0;0 1 2 5];

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