File: plotting25.mac

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M: matrix([1,2,3,4],[1,2,3,2],[1,2,3,4],[1,2,3,3])$
f(x,y) := float('M [round(x), round(y)])$
plot3d (f(x,y), [x,1,4], [y,1,4], [grid,3,3], nolegend,
  [pdf_file,"./plotting25.pdf"]);
plot3d (f(x,y), [x,1,4], [y,1,4], [grid,3,3], nolegend,
  [png_file,"./plotting25.png"]);