Custom color map for plotting matrix values

Here's an example of what I want to do, but instead of a loop for the plot, I want to feed in plot(x,y); instead of plot(x,y(i,:))

 % Define vector values
 n = 101; N = 30;
 x = linspace(0,2,n);
 y = ((-N/2:N/2)').*x.^4;
 % Plot
 figure; hold on;
 % Prepare colormap
 Color1 = [0,0.5,1];
 Color2 = [1,0.5,0];
 for i = 1:N
     Col = Color1 + (Color2 - Color1)*(i-1)/(N-1);
     plot(x,y(i,:),'Color',Col);
 end

Where, I want to replace

 for i = 1:N
     Col = Color1 + (Color2 - Color1)*(i-1)/(N-1);
     plot(x,y(i,:),'Color',Col);
 end

with

 for i = 1:N
     Col(i,:) = Color1 + (Color2 - Color1)*(i-1)/(N-1);
 end
 plot(x,y,'Colors',Col);

with the following plot as the result.

[Adam]

What are you actually trying to do? Colourmaps don't apply to line plots whose default colours are controlled by the 'ColorOrder' property of the colourmap.

But your 'Col' variable is just a 3-element vector - i.e. a single colour, so if you just want to set all lines to the one colour then that is trivial, but doesn't count as a colourmap so I assume something is missing from your example?

[AK19]

Ah, thanks for pointing that out.

I want to change the colours of the line plots without having to set a hold on; plotting loop.

in the loop, it should be (and I've alredy edited it)

for i = 1:n

Col(i,:) = Color1 + (Color2 - Color1)*(i-1)/(n-1);

end

And I'll try out the ColorOrder property, thanks!

Answer 1

[Image Analyst]

I think you probably want scatter(). With scatter(), you can pass in an array of colors so that you can vary each data point's color on a point-by-point basis.

If you really want color order, see my attached demo, but I don't think you want that over scatter.

[AK19]

I like that you can alter the colours, but I want to feed a matrix of y-values into the plotting function, and scatter doesn't do that. I also still want line plots.

[Image Analyst]

OK, now that I see what you want in your plot you just inserted I guess you want colored lines so scatter() can't do that.

But did my colororder demo help you? Look - I'll even include a screenshot from it:

Look like what you want, right?

[AK19]

Looks great! Thanks!