how to represent the purple color by a string value

There are 8 colors that can be specified by a string value: 'r','g','b','c','m','y','k','w'.

How to specify the maroon,olive,purple color by a string value.

[KEERTHIGA]

how to represent violet in string

[Image Analyst]

@KEERTHIGA you can't. Computers cannot reproduce violet. The spectrum of the blue emitting pixels does not go down to a short enough wavelength. You can do purple though. Purple is red and blue, so you could do

purple = [128, 0, 128] / 255;

You can then use "purple" wherever you need to specify the color, for example

plot(rand(1, 10), 'Color', purple, 'LineWidth', 9);

Answer 1

[John D'Errico]

You can't. MATLAB offers those string options for colors. If you want to set a specific color, you can, but as a numeric vector of length 3. You need to provide RGB code values.

For example, for a purple of sorts, you might do this:

H = surf(rand(10));
H.FaceColor = [.5 0 .5];

Not my favorite color scheme, but it is purple. And, for an olive, you might try something like this:

H.FaceColor = [.3 .4 .2];

You get the idea.

https://www.e-paint.co.uk/Lab_values.asp?cRange=BS%20Other&cRef=BS%20278&cDescription=Light%20olive%20green

Answer 2

[DGM]

See also:

https://www.mathworks.com/matlabcentral/fileexchange/48155-convert-between-rgb-and-color-names

https://www.tutorialrepublic.com/css-reference/css-color-names.php

and so on

Answer 3

[Walter Roberson]

To represent colors by string, you can use a quoted hexadecimal triplet. For example,

plot(y, 'Color', '#800080')

However, the only available named colors are

"red", "green", "blue", "cyan", "magenta", "yellow", "black", "white", and "none"