Plot Matrix in Octave

[Bratsch]

Hello everyone. I am new in this forum and I hope that someone can help me :)

I have to visualize the path of the longest common substring in a matrix.
But I don't get it to draw, plot or whatever the matrix containing values.
And the path is also a big problem.

It should look like this picture:
http://www.nabble.com/file/p13710192/alignment5.gif 


Is it possible in Octave to plot a matrix f.e. A = [1,2,3,4; 2,3,4,5;
3,4,5,6; 4,5,6,7] with the red path like it is shown in the picture?
And is it possible to mark the matrix with the letters T, A, A, G,.. like it
is done in the picture?

If someone could help me would be perfect. Thanks in advance

Bye
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