idlastro / Miscellaneous (Non-Astronomy) Procedures: MAKE_2D

[Source code]

NAME
MAKE_2D
PURPOSE
Change from 1-d indexing to 2-d indexing
EXPLANATION
Convert an N element X vector, and an M element Y vector, into
N x M arrays giving all possible combination of X and Y pairs.
Useful for obtaining the X and Y positions of each element of
a regular grid.
CALLING SEQUENCE
MAKE_2D, X, Y, [ XX, YY ]
INPUTS
X - N element vector of X positions
Y - M element vector of Y positions
OUTPUTS
XX - N x M element array giving the X position at each pixel
YY - N x M element array giving the Y position of each pixel
        If only 2 parameters are supplied then X and Y will be
        updated to contain the output arrays
EXAMPLE
To obtain the X and Y position of each element of a 30 x 15 array
IDL> x = indgen(30)  &  y = indgen(15)     
IDL> make_2d, x, y 
REVISION HISTORY
Written,    Wayne Landsman    ST Systems Co.    May, 1988
Added /NOZERO keyword       W. Landsman         Mar, 1991
Converted to IDL V5.0   W. Landsman   September 1997
Improved speed          P. Broos      July 2000
pdate X and Y vectors