Array subsetting

Hello all,

I am running into difficulties using the WHERE function to subset
arrays. I am currently writing a program which needs to apply a
threshold to a real array of dimension (nx,ny). Lets call this array1.
I then have a second real array - lets call that array2- (I understand
all the arrays in the where statement must be of the same type?) which
will store the result as a binary value. It too has dimension (nx,ny).
Heres the way it appears in the program.

INTEGER,PARAMETER :: nx,ny
REAL :: threshold
REAL,DIMENSION(:,:),ALLOCATABLE :: array1,array2

ALLOCATE(array1(nx,ny))
ALLOCATE(array2(nx,ny))

WHERE (array1 > threshold)
array2 = 1.0
ELSE WHERE
array2 = 0.0
END WHERE

On trying to run this, I always get a stack overflow. I can't figure it
out, because the arrays are of the same rank, size and type. It may be
important that array1 actually sits in a global data module, whereas
array2 is local to the subroutine which thresholds the data.

Any help would be greatly appreciated.

Luke

.

Relevant Pages

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