function y = plotcolor(x)
% PLOTCOLOR Returns plot color strings
% y = PLOTCOLOR(x) returns sequentially the color strings
% 'b','r','g','c','m','k','y' for integer values of x.
% This function is intended to be used within for loops where
% there is the need of plotting with different colors sequentially.
% If x is a vector, y will be a length(x) x 3 matrix where each row
% corresponds to one color string (the string is length 3 because it
% includes two quotes and the letter).
x = mod(x-1,7)+1;
c = ['b','r','g','c','m','k','y',];
for i = 1 : length(x)
y(i,:) = [char(39), c(x(i)), char(39)];