The PLplot Plotting Library: Programmer's Reference Manual
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plvec2: Vector plot, general 2-d mapping for Fortran 77

plvec2 (u, v, nx, ny, scale, xg, yg);

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.

xg, yg (PLFLT *, input)

Pointers to arrays which specify the transformation from array indices to world coordinates. These must be two-dimensional arrays, used for a transformation of the form: tx = f(x, y), ty = f(x, y). Function values at locations between grid points are obtained via linear interpolation.

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 pltr2 for the same capability.

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plvec1: Vector plot, general 1-d mapping for Fortran 77Upplvect: Vector plot, fixed linear mapping for Fortran 77