# is it posible to create matrixplot for several data types?

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Dany on 28 May 2014
Commented: David Sanchez on 6 Jun 2014
Hi, i have a data set on wich i performed a PCA analysis. after getting the "scores" of the analysis im trying to create a matrixplot. i also have two index vector. because the data consists of two groups.
my question is:
is it possible to create a matrixplot that each group (according to the index vectors) will be in a different color? if im writing "matrixplot(X)" it gives me a matrixplot with all the data points in same color, i want to separate the two groups by color and show them on the same matrixplot.
Dany
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Dany on 28 May 2014
i have the data (X) wich is 10000x2.
i have the indx vectors (indx1, indx2) wich are (1000x1 and 9000x1 respectively.
when i do : plotmatrix(X), i get a matrix plot of all 10000 points.
i would like to do: plotmatrix(X(indx1,:),'b.'), which will give me matrix plot of 9000 points and then on top of that enother matrix plot with plotmatrix(X(indx2,:),'r.'), but i would like it to be in the same matrix plot.

David Sanchez on 28 May 2014
I think -plotmatrix-does not have the option of holding the plot to add extra data. You can use plot and hold on instead:
plot(X(indx1,1),X(indx1,2)'b.')
hold on
plot(X(indx2,1),X(indx2,2)'r.')
hold off
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David Sanchez on 6 Jun 2014
I agree, but if the built-in function does not exist, you have to code it yourself