plvec0: Vector plot, identity mapping for Fortran 77

`plvec0`: Vector plot, identity mapping for Fortran 77
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`plvec0`: Vector plot, identity mapping for Fortran 77

`plvec0 (`	`u`,
	`v`,
	`nx`,
	`ny`,
	`scale)`;

Draws a vector plot of the data in (u[nx][ny], v[nx][ny]).

u, v (PLFLT **, input): Pointer to a pair of vectored two-dimensional arrays containing the x and y components of the vector to be plotted.
nx, ny (PLINT, input): Physical dimensions of the arrays u and v.
scale (PLFLT, input): Parameter to control the scaling factor of the vectors for plotting. If scale = 0 then the scaling factor is automatically calculated for the data. If scale < 0 then the scaling factor is automatically calculated for the data and then multiplied by -scale. If scale > 0 then the scaling factor is set to scale.

NOTE: this function is intended for use from a Fortran 77 caller only. The C user should instead call plvect using the built-in transformation function pltr0 for the same capability.

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