Thread Subject: Plotting in different colors

I have some points to plot on a 2D plane. The points can be
classified into a number of categories, e.g., say 100
categories. I want the points of each of the categories to
have same color while differing from category to category.
Is there any way to plot this in a single figure? I tried to
understand how colormap works, but couldn't figure it out.
Thanks in advance for anyone who comes forward.

I often end up doing this, the trick is to use the 3rd
input to plot see the code example below

colors=['b';'g';'r';'c';'m';'y';'k'];
markers=['.';'o';'x';'+';'*';'s';'d';'v'];
lines=['- ';': ';'-.';'--';' '];
variable1used=[1:4];
variable2used=[1:5];
for i=variable1used
    for j=variable2used
        x=squeeze(xdata(i,j,:));
        y=squeeze(ydata(i,j,:));
        plot(x,y,[colors(i) lines(j,:)])
        hold on
    end
end

that'll print all the variable1 with the same color and
all the variable 2 with the same line. You can add
another variable for different marker styles.
"Swaprava Nath" <swaprava@gmail.com> wrote in message
<fif4p4$mel$1@fred.mathworks.com>...
> I have some points to plot on a 2D plane. The points can
be
> classified into a number of categories, e.g., say 100
> categories. I want the points of each of the categories
to
> have same color while differing from category to
category.
> Is there any way to plot this in a single figure? I
tried to
> understand how colormap works, but couldn't figure it
out.
> Thanks in advance for anyone who comes forward.

In article <fif4p4$mel$1@fred.mathworks.com>,
Swaprava Nath <swaprava@gmail.com> wrote:
>I have some points to plot on a 2D plane. The points can be
>classified into a number of categories, e.g., say 100
>categories. I want the points of each of the categories to
>have same color while differing from category to category.
>Is there any way to plot this in a single figure? I tried to
>understand how colormap works, but couldn't figure it out.
>Thanks in advance for anyone who comes forward.

scatter(X,Y,S,C)

where S is the marker size
and C is the color vector. You could make C the category number for
each point, or you could make C a matrix of RGB triples giving
the exact color you want for each point.

--
   "I was very young in those days, but I was also rather dim."
   -- Christopher Priest