# Matlab choose random color for plotting

I have 6 vectors which I want to plot. How I can make each plot with different color (random)? With the code below, the plot limited to one color for all six vectors.

plot(x,y,'-rs','LineWidth',1,... 'MarkerEdgeColor','k',... 'MarkerFaceColor','g',... 'MarkerSize',5);

## Answers

You can have PLOT automatically choose line colors for you. If all 6 of your vectors are the same length, you can put the x and y coordinates into N-by-6 matrices X and Y and pass these to PLOT. A different color will be used for each column:

plot(X,Y,'-s'); %# Plots lines with square markers

You could also use some of the built-in colormaps to generate a set of colors, then use these when you plot each line separately. For example:

cmap = hsv(6); %# Creates a 6-by-3 set of colors from the HSV colormap for i = 1:6 %# Loop 6 times plot(X(:,i),Y(:,i),'-s','Color',cmap(i,:)); %# Plot each column with a %# different color end

To create a random color map, you could do the following

myMap = rand(nbColors, 3); for i = 1:nbColors plot(X(:,i),Y(:,i),'-s','Color',myMap(i,:)); end

However, as I stated in my comment to gnovice's answer, picking colors out of a colormap generally provides much more readable color combinations.