GNU Info

(gnuplot.info)matrix

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Enter node , (file) or (file)node

 The `matrix` flag indicates that the ASCII data are stored in matrix format.
 The z-values are read in a row at a time, i. e.,
       z11 z12 z13 z14 ...
       z21 z22 z23 z24 ...
       z31 z32 z33 z34 ...
 and so forth.  The row and column indices are used for the x- and y-values.