how to plot 40 different colors in matlab graph

i am plotting 200 users in a cells.

Among 200 users first five users should be in one color,next five in other color,and so on till i have plotted all 200users.

So totally i need 40 different colors to differentiate them.

I mentioned 8 colors using( 'm','g','y','b','r','c','w','k').How can I represent the rest of 32 colors in graph.

Could anyone please help me on this.

Answer 1

[Image Analyst]

jaah:

Try this:

% x and y are your data, in rows of a matrix.
numDataSets = size(x, 1); % For example 200
plotColors = jet(numDataSets/5); % 40 different colors.
for row = 1 : numDataSets
    % Extract this particular set of (x,y) coordinates from the whole data set.
    thisX = x(row, :);
    thisY = y(row, :);
    % Now plot just this one.
    thisIndex = ceil(row/5);
    thisColor = plotColors(thisIndex, :);
    plot(thisX, thisY, '-', 'Color', thisColor, 'LineWidth', 2);
    hold on;  % Leave plots up so we'll see all of them at the end.
end
grid on;
xlabel('x', 'FontSize', 20);
ylabel('y', 'FontSize', 20);
title('Demo by Image Analyst', 'FontSize', 20);

[Thomas Dixon]

Thanks you!!!

Answer 2

[Rakhi Agarwal]

Colors in Matlab plot that you are using are basically RGB triplets. For example

blue b [0,0,1]

black k [0,0,0]

red r [1,0,0]

green g [0,1,0]

white w [1,1,1] etc.

You can define more colors using RGB triplets. You can specify colors using a vector. Usually RGB colors have values from 0 to 255. You can use those numbers and divide the vector by 255 to use within MATLAB. You can put in the RGB triplet (as a vector) directly into the plot command.

Read more about it here:

http://math.loyola.edu/~loberbro/matlab/html/colorsInMatlab.html

[jaah navi]

ok.Could you please help me how to represent purple color by a string.

[Rakhi Agarwal]

Sure. Use this:

plot(data1, 'Color',[.6 .5 .7])

It'll make a nice purple color.

[jaah navi]

I used the following command to plot the grpah

cluster_colors = ['m','g','y','b','r','c','k','[.6 .5 .7]'];% for different colors

when i run the code it gives error stating Specified string is an invalid color value.

I know its due to the representation [.6 .5 .7] along with the other string.

Could you help me to how to represent purple color along with the remaining colors in the command to get executed without any error.

[Rakhi Agarwal]

Don't put it in ' '. And define other colors also as RGB. Use this:

cluster_colors = [[1,0,1]; [0,1,0]; [1,1,0]; [0,0,1]; [1,0,0]; [0,1,1]; [0,0,0]; [.6 .5 .7]];% for different colors

Now just use this to plot:

plot(data1, 'Color', cluster_colors(5,:))

Replace 5 with whichever color you want from cluster_colors array.

[jaah navi]

when i used the folowing command

cluster_colors = [[1,0,1]; [0,1,0]; [1,1,0]; [0,0,1]; [1,0,0]; [0,1,1]; [0,0,0]; [.6 .5 .7]];

Its showing error stating Color value must be a 3 element vector.

[Rakhi Agarwal]

Works fine for me. Can you show the created cluster array from your workspace?

[Stephen23]

@jaar navi: this worked without error when I tried it:

>> M = [1,0,1;0,1,0;1,1,0;0,0,1;1,0,0;0,1,1;0,0,0;0.6,0.5,0.7];
>> plot([0,1],[1,0],'-*','Color',M(8,:))

While that page is okay, it totally fails to mention how to change the ColorOrder property, which would actually be quite useful for you.

[jaah navi]

data displayed in workspace

1 0 1

0 1 0

1 1 0

0 0 1

1 0 0

0 1 1

0 0 0

0.600000000000000 0.500000000000000 0.700000000000000

[Rakhi Agarwal]

This looks fine. It should work. It's working fine for me.

cluster_colors = [[1,0,1]; [0,1,0]; [1,1,0]; [0,0,1]; [1,0,0]; [0,1,1]; [0,0,0]; [.6 .5 .7]];% for different colors
plot(data1, 'Color', cluster_colors(5,:))

Try again. Don't forget to clear variables to avoid error due to previously stored value at the beginning of the code.

clear variables

[Thomas Dixon]

I fail to see how we plot multiple different colours from this? I am looking for something where I can plot some number of lines with different colours on the same plot by hopefully providing a matrix of (nx3) or (3xn) numbers where the 3 is the rgb triplet and n is the number of lines. Is this possible?

[Thomas Dixon]

I am adding this so i can follow activity

[Image Analyst]

Thomas, yes, for example

% x and y are your data, in rows of a matrix.
numDataSets = size(x, 1);
plotColors = jet(numDataSets);
for row = 1 : numDataSets
    % Extract this particular set of (x,y) coordinates from the whole data set.
    thisX = x(row, :);
    thisY = y(row, :);
    % Now plot just this one.
    plot(thisX, thisY, '-', 'Color', plotColors(row, :), 'LineWidth', 2);
    hold on;  % Leave plots up so we'll see all of them at the end.
end
grid on;
xlabel('x', 'FontSize', 20);
ylabel('y', 'FontSize', 20);
title('Demo by Image Analyst', 'FontSize', 20);