Function: PGCOTIC Purpose: Contour map of a 2D data array, with blanking and ticks. Category: GRAPHICS File: pgplot.src Author: M. Vogelaar Use: CALL PGCOTIC(A , Input REAL ARRAY (2d) IDIM , Input INTEGER JDIM , Input INTEGER I1 , Input INTEGER I2 , Input INTEGER J1 , Input INTEGER J2 , Input INTEGER C , Input REAL ARRAY NC , Input INTEGER TR , Input REAL ARRAY BLANK, Input REAL TLEN, Input REAL TSTEP ) Input INTEGER A Data array. IDIM First dimension of A. JDIM Second dimension of A. I1 Start of range of first index to be contoured (inclusive). I2 End of range of first index to be contoured (inclusive). J1 Start of range of second index to be contoured (inclusive). J2 End of range of first index to be contoured (inclusive). C Array of contour levels (in the same units as the data in array A); dimension at least NC. NC number of contour levels (less than or equal to dimension of C). The absolute value of this argument is used (for compatibility with PGCONT, where the sign of NC is significant). TR 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 Elements of array A that are exactly equal to this value are ignored (blanked). TLEN Length of ticks in world coordinates. If TLEN is positive, the direction of the ticks is toward a maximum. If it is a negative number, it points to a minimum. TSIZE Separation of ticks in grids. Description: Draw a contour map of an array. This routine is the same as PGCONS, except that array elements that have the "magic value" defined by argument BLANK are ignored, making gaps in the contour map. The routine may be useful for data measured on most but not all of the points of a grid. It also plots ticks normal to contour. The ticks have length TLEN and are plotted at i mod TSTEP. Updates: Nov 14, 1994: VOG Document created.