MATLAB Answers

How to specify line color using a hexadecimal color code

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Hi,
why the plot function return an error message when I specify the color as a hexadecimal color code i.e
x = linspace(-2*pi,2*pi);
y = sin(x);
plot( x , y , 'Color' , '#FF0000' )
Error using plot
Specified character vector is an invalid color value.

Accepted Answer

Akira Agata
Akira Agata on 24 Apr 2019
It would be due to your MATLAB version. Hexadecimal color code can be used in the latest version (R2019a).
If your version is R2018b or older, you have to convert hex color code to 1-by-3 RGB array, like:
x = linspace(-2*pi,2*pi);
y = sin(x);
% Convert color code to 1-by-3 RGB array (0~1 each)
str = '#FF0000';
color = sscanf(str(2:end),'%2x%2x%2x',[1 3])/255;
figure
plot(x, y, 'Color', color)

More Answers (2)

Subrata Paul
Subrata Paul on 30 Jul 2019
You can also use some color :
Matlab plotting colors
The following are the letters you can add to your code to control the color of your plot while plotting in Matlab.
  • b blue
  • g green
  • r red
  • c cyan
  • m magenta
  • y yellow
  • k black
  • w white
. point
o circle
x x-mark
+ plus
* star
s square
d diamond
v triangle (down)
^ triangle (up)
< triangle (left)
> triangle (right)
p pentagram
h hexagram
— dashed
-. dashdot
: dotted
– solid
Link: https://tutorial45.com/matlab-plot-colors-and-styles/

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