plsmem: Set the memory area to be plotted

The PLplot Plotting Library: Programmer's Reference Manual
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### `plsmem`: Set the memory area to be plotted

`plsmem` (maxx, maxy, plotmem);

Set the memory area to be plotted (with the "mem" driver) as the `dev` member of the stream structure. Also set the number of pixels in the memory passed in `plotmem`, which is a block of memory `maxy` by `maxx` by 3 bytes long, say: 480 x 640 x 3 (Y, X, RGB)

This memory will have to be freed by the user!

`maxx` (`PLINT`, input) Size of memory area in the X coordinate. `maxy` (`PLINT`, input) Size of memory area in the Y coordinate. `plotmem` (`void *`, input) Pointer to the beginning of the user-supplied memory area.

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