plvect: Vector plot, fixed linear mapping for Fortran 77

The PLplot Plotting Library: Programmer's Reference Manual
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### `plvect`: Vector plot, fixed linear mapping for Fortran 77

`plvect` (u, v, nx, ny, scale);

When called from Fortran 77, this routine has the same effect as when invoked from C. The interpretation of all parameters (see `plvect`) is also the same except there is no transformation function supplied as the last parameter. Instead, a 6-element array specifying coefficients to use in the transformation is supplied via the named common block `plplot` (see code). Since this approach is somewhat inflexible, the user is recommended to call either of `plvec0`, `plvec1`, or `plvec2` instead.

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`plvec2`: Vector plot, general 2-d mapping for Fortran 77 | Up | `plmesh`: Plot surface mesh for Fortran 77