MATLAB: 2D plot with 3rd variable

2dplotthird variable

hey, i have many lines in X and Y axes, need to color each line according to a variable Z, how to do that ?

already plotted all the lines needed but need to add the color for each line according to the value of Z. for example if Z= 0 the line will take a color and if it;s 0.8 it takes another color( i mean how to add a colorbar for this )

thanks

Best Answer

Hello Michel,

I think you can use RGB colors so if you have the data in rows in X and Y it would be somethink like:

figure hold on for i = 1:size(X,1) plot(X(i,:),Y(i,:),'color',[Z(i) 0 1]) % There is needed that Z has a value from 0 to 1 for each row end

Hope it helps!

Related Solutions

MATLAB: Using colormap in plot3d

plot3(x,y,z) will produce 1 line object for each column of the inputs. Each line object can have its own color. So, all you have to do is arrange the data properly.

h = plot3([x(:).'.*[1;1]], [y(:).'.*[1;1]]), [z1(:).', z2(:).'], '-');
set(h, {'Color'},  mat2cell(jet(numel(x)),ones(numel(x),1),3));

The syntax [x(:).'.*[1;1]] produces two rows of identical x values.

The mat2cell() syntax converts your color matrix to cell array of 1x3 values.

MATLAB: Declaring plot arguments/options beforehand

lineColor = {'k', 'r', 'b', 'm'};
linestyle = {'-'; '--'; ':'; '-.'};
for j = 1:4
    options = {'color',lineColor{j}, 'LineStyle', linestyle{j}};
    plot(X(:,j), Y(:,j), options{:})
end

Best Answer

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MATLAB: Using colormap in plot3d

MATLAB: Declaring plot arguments/options beforehand

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