|The PLplot Plotting Library: Programmer's Reference Manual|
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Creates a new stream and makes it the default. Differs from using
plsstrm, in that a free stream number is found, and returned.
Unfortunately, I have to start at stream 1 and work upward, since
stream 0 is preallocated. One of the big flaws in the PLplot API is
that no initial, library-opening call is required. So stream 0 must
be preallocated, and there is no simple way of determining whether it
is already in use or not.
This function is used in examples 1,20.