Hi Roots, I have the following problem concerning TGraph and the Linear Algebra package: I want to plot several lineplots in a single graph using the TGraph class. All plots use the same x-values stored in a float pointer *x but have (of course) different y-values. The y-values are stored in a Matrix nK(i,j) of the TMatrix class, each line of the Matrix corresponds to the y-values of one plot. Now the problem is, that TGraph needs 2 float pointers pointing at the x and y values of the plot. So if I want to use TGraph I have to set float pointers pointing on each line of the TMatrix Object. I would like to know how one does that with a real good programming style using the linear algebra package of ROOT! Has anyone an idea? Thanks a lot in advance! Martina
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