Name: PGVECT Purpose: vector map of a 2D data array, with blanking Category: GRAPHICS File: pgplot.src Author: T.J. Pearson Use: see description below. Description: SUBROUTINE PGVECT (A, B, IDIM, JDIM, I1, I2, J1, J2, C, NC, TR, 1 BLANK) INTEGER IDIM, JDIM, I1, I2, J1, J2, NC REAL A(IDIM,JDIM), B(IDIM, JDIM), TR(6), BLANK, C Draw a vector map of two arrays. This routine is similar to PGCONB in that array elements that have the "magic value" defined by the argument BLANK are ignored, making gaps in the vector map. The routine may be useful for data measured on most but not all of the points of a grid. Vectors are displayed as arrows; the style of the arrowhead can be set with routine PGSAH, and the the size of the arrowhead is determined by the current character size, set by PGSCH. Arguments: A (input) : horizontal component data array. B (input) : vertical component data array. IDIM (input) : first dimension of A and B. JDIM (input) : second dimension of A and B. I1,I2 (input) : range of first index to be mapped (inclusive). J1,J2 (input) : range of second index to be mapped (inclusive). C (input) : scale factor for vector lengths, if 0.0, C will be set so that the longest vector is equal to the smaller of TR(2)+TR(3) and TR(5)+TR(6). NC (input) : vector positioning code. <0 vector head positioned on coordinates >0 vector base positioned on coordinates =0 vector centered on the coordinates TR (input) : array defining a transformation between the I,J grid of the array and the world coordinates. The world coordinates of the array point A(I,J) are given by: X = TR(1) + TR(2)*I + TR(3)*J Y = TR(4) + TR(5)*I + TR(6)*J Usually TR(3) and TR(5) are zero - unless the coordinate transformation involves a rotation or shear. BLANK (input) : elements of arrays A or B that are exactly equal to this value are ignored (blanked). Updates: Oct 16, 1998: JPT automatically extracted from source.