Output of Function in Form of 'Color',[0 0.2 0.4]!

Dear Community, I want to write a Function clrs('color') which returns 'Color',[0 0.2 0.4] as an argument so that I can do plot(x,y,clrs('green')); I tried it with str = ' ''Color'',[0 0.2 0.4] '; and with eval but it doesn't work. Do you have any idea how i can do that?

    function [out] = clrs(color)

    if (strcmp('blue',color) == 1)
        value = [0 0.447 0.741];
    end

    out{1} = 'Color';
    out{2} = value;
    end

plot([1 2],[1 2],'x',clrs('blue'));

[Adam]

Off the top of my head I don't think that is possible. To pass two distinct arguments to the plot function they would have to be in e.g a cell array as

args = { 'color', [0 0.2 0.4] };

Then you can pass

plot( ..., args{:} )

but I don't think there is any syntax that allows you to return multiple arguments out of a function and pass them to another. You cannot chain a {:} on the end of a function call either unless I am much mistaken.

Answer 1

[M]

clrs('blue')

returns

ans = 

    'Color'    [1x3 double]

so you cannot use it directly in the plot command.

First you need to access :

b=clrs('blue')
b = 
  'Color'    [1x3 double]

and then get the value

b{2}
ans =

         0    0.4470    0.7410

But you will not be able to use it directly in the plot command, see the plot documentation .

Answer 2

[Ingo Hermann]

Thank you for your fast response :D Then I have to write all the time 'Color' in front of my function...

Answer 3

[Steven Lord]

One alternative would be to write a function named setcolor that accepts a handle of the line you plotted and sets its Color property.

setcolor = @(h, newcolor) set(h, 'Color', newcolor);
h = plot(1:10, 1:10);

pause % so you can see the original color

setcolor(h, 'r')

For simple demonstration purpose I wrote a basic setcolor as an anonymous function. You can create a more powerful and more complicated version as a regular function file.

Answer 4

[Adam]

Well, you can do:

colourArgs = clrs('blue')
plot([1 2],[1 2],'x', colourArgs{:});

if you are willing to accept two lines of code!