How do I create a colored intensity plot from location and intensity values

Question

Joshua 2023-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/1941279-how-do-i-create-a-colored-intensity-plot-from-location-and-intensity-values

评论： Jon 2023-4-4

There are 13 points with an x and y coordinate. Each point has an intensity value from 1-20. I'm wondering how to display a plot with a colored intensity map simillar to a heat map. Any suggestions?

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Answer 1

MarKf 2023-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/1941279-how-do-i-create-a-colored-intensity-plot-from-location-and-intensity-values#answer_1208814

在 MATLAB Online 中打开

Could imagesc work?

sysize = 100; maxintensity = 20; npoints = 13;

coords = randi(sysize,[npoints,2]);

imatc = nan(sysize);

for icx = 1:size(coords,1), imatc(coords(icx,1),coords(icx,2)) = randi(maxintensity,1); end

clims = [1 maxintensity];

imagesc(imatc,clims), xlabel('x'),ylabel('y'), colorbar

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Answer 2

Jon 2023-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/1941279-how-do-i-create-a-colored-intensity-plot-from-location-and-intensity-values#answer_1208819

在 MATLAB Online 中打开

This is one approach

% define x,y coordinates and corresponding z value
x = rand(13,1)
y = rand(13,1)
z = x.*y
% make evenly spaced x,y grid to plot data on
[xq,yq]=meshgrid(0:0.1:1,0:0.1:1);
% interpolate data points onto grid
zq = griddata(x,y,z,xq,yq);
% make a filled contour plot (heatmap)
contourf(zq,xq,yq)