[Plplot-general] drawing multi-column data

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Hi Plplot users,

I am trying to draw the data that occupies several columns for an x-y plot
using plplot-tcl. The x index is stored in a 1D matrix "t". A 2D matrix,
"d", is defined to store the data. Each column in "d" is the data for a
variable. The question is how to refer to a column in a 2D tcl matrix? For
example, how to plot the first column of "d" versus "t"? I tried plline
1000 t d  0 *, but didn't work.

Thanks for your help!

Frank