Can I specify the color of a graphics object by its index in the ColorOrder?

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Ulrich Reif 2021-8-16

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评论： Stephen23 2021-8-17

Specifying colors of graphics objects by characters is most convenient, like in

plot([1 2],'r--')

Is there a similar way to select colors by their index in the ColorOrder? That is, I am looking for something like

plot([1 2],'2--')

as an abbreviation for

c = get(gca,'ColorOrder');

plot([1 2],'--','Color',c(2,:))

If not (as I assume) it would be really great to have that in a future release.

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DGM 2021-8-17

编辑：DGM 2021-8-17

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Then let me ask your opinion on what might be an alternative. Given that the flexibility of the simplified syntax for plot() would lead to ambiguities if trying to basically cram another parameter into the string, what about using the new colororder() function? Would it be possible/practical/more elegant to provide an unambiguous means of directly addressing in a call to colororder()?

Something like

secondtuple = colororder(axishandle,2);

or something similar that would allow colororder() to be used inline?

plot(mydata,'--','Color',colororder(gca,2))

Or would there be a better way other than just pulling the color table in a separate line?

Stephen23 2021-8-17

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I second this proposed syntax:

plot(..,'Color',index)

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回答（2 个）

Wan Ji 2021-8-16

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If you want different colors, you can use matlab build-in color series like jet, hsv, bone, copper. Eaxmples are

n = 1:6;
color = jet(length(n));
x = 0:0.1:7;
hold on
a = arrayfun(@(i)plot(x,gampdf(x,n(i)),'color',color(i,:)), 1:length(n));
legend(arrayfun(@(i)['\Gamma(',num2str(n(i)),',1)'],1:1:length(n),'uniform',false))

You can also use random colors

n = 1:6;
color = rand(length(n),3);
x = 0:0.1:7;
hold on
a = arrayfun(@(i)plot(x,gampdf(x,n(i)),'color',color(i,:)), 1:length(n));
legend(arrayfun(@(i)['\Gamma(',num2str(n(i)),',1)'],1:1:length(n),'uniform',false))

Actually, color in matlab is a 1x3 array with interval [0,1]

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Wan Ji 2021-8-17

编辑：Wan Ji 2021-8-17

how many colors there are! I dont think this idea is brilliant. Just use the existing colors or color tables are enough to tell people the differences of all the curves.

Stephen23 2021-8-17

编辑：Stephen23 2021-8-17

"how many colors there are!"

Seven.

"Just use the existing colors"

The line ColorOrder are existing colors:

https://www.mathworks.com/help/matlab/creating_plots/defining-the-color-of-lines-for-plotting.html

https://www.mathworks.com/help/releases/R2019a/matlab/graphics_transition/why-are-plot-lines-different-colors.html

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Image Analyst 2021-8-16

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ColorOrder_demo.m

See my attached demo that shows you how to change the default color order:

The demo allows you to pick from the set of 20 or so built-in colormaps (I used jet in the demo above), though you could of course define your own custom colors. Adapt as needed.

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DGM 2021-8-16

OP wasn't asking how to assign a new color table to the 'colororder' property, but rather if there were a more convenient method to specify a color by its index within the existing colortable set in 'colororder' -- whatever colortable that might be at the time.

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