Custom color map for plotting matrix values

7 次查看（过去 30 天）
AK19
AK19 2017-7-28
评论： AK19 2017-11-17
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.
  2 个评论
Adam
Adam 2017-7-28
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
AK19 2017-7-30
编辑：AK19 2017-7-30
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!

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Image Analyst
Image Analyst 2017-7-30
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.
  3 个评论
显示 1更早的评论
Image Analyst
Image Analyst 2017-7-30
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?

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Orange 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by