making a color plot with 3 matrices

Question

Joseph 2015-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/242586-making-a-color-plot-with-3-matrices

编辑： Joseph 2015-9-12

i have 2 matrices as E(43,30619) and C(43,30619) and an altitude array as alt(43,1), E and C is related to altitude i want to plot a color plot in which put E ax X axis and C as Y axis and alt determines the color of points. i have used below script, but i couldn't get the plot i was expecting.

can any one please help me.

thank you

 Z = alt;
[dummy ID]=sort(Z);
colors=colormap(jet(length(Z)));
% figure
d=0;
for i=1:length(Z)
    X = EE(i,:);
Y =C_2(i,:);
plot(X(i),Y(i),'.','Color',colors(ID(i),:));
hold on
d=d+1;
end;

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Answer 1

Walter Roberson 2015-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/242586-making-a-color-plot-with-3-matrices#answer_192120

在 MATLAB Online 中打开

pointsize = 14;
scatter(E(:), C(:), pointsize, repmat(colors(ID,:), size(E,2), 1) );

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Walter Roberson 2015-9-12

You indicated that E(43,30619) and C(43,30619) . As those are exactly the same size, E(:) and C(:) would have to be exactly the same size. Please recheck the sizes of E and C.

By the way: you are aware, I hope, that you are plotting more than a million points? You are going to have difficulty seeing them all unless you have a high resolution display.

Joseph 2015-9-12

编辑：Joseph 2015-9-12

yes, it was my mistake, sorry about it. by mistake i used matrices with different dimensions. but using matrices with same dimension this time it didn't give error. it gives a plot with white screen. i think as you said, probably the number of points are too many that the display can't show the graph.

thank you, helped a lot.

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