MATLAB: Colormap for multline plot

colormapplot

How do I change the colormap of a multiline plot and have it change the colors of the existing lines? I am using Matlab 2018b. Here is a simple example.
x = rand(10,1000);
t = 0:999;
plot(t, x)
colormap winter
colormap white
colormap flag
fh = gcf;
fh.Colormap = colormap('flag');
fh.Children(1).Colormap = colormap('flag');
For me, the colors of the lines do not change. The following also did not work, the lines are plotted using the "default" color scheme.
fh2 = figure;
fh2.Colormap = colormap('flag');
ax = axes(fh);
ax = axes(fh2);
ax.Colormap = colormap('flag');
plot(ax, t, x)
Invoking "colorbar" shows a colorbar using the desired colormap. Using colormap with surf(peaks) does change the color of that plot. How do I change the colormap of a 2D multiline plot?

Best Answer

"A colormap is matrix of values between 0 and 1 that define the colors for graphics objects such as surface, image, and patch objects. MATLAB® draws the objects by mapping data values to colors in the colormap." from https://in.mathworks.com/help/matlab/ref/colormap.html
But you are trying to apply colormap to line data instead of surface, image, patch data objects.
You can apply 'color' field to line data. This answer can help you https://in.mathworks.com/matlabcentral/answers/396900-how-can-i-change-the-line-color-in-a-2d-graph-using-colormap#comment_560420
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