HP MLIB User's Guide Vol. 2 7th Ed.

578 HP MLIB User’s Guide
CRC3FT/ZRC3FT Real-to-complex three-dimensional FFT
l1 Number of rows of data, l1 > 0.
l2 Number of columns of data, l2 > 0.
l3 Number of planes of data, l3 > 0.
ldz The leading dimension of array z, with ldz ≥ l1.
mdz The middle dimension of array z, with mdz ≥ l2.
iopt Option flag:
iopt ≥ 0 Compute forward transform.
iopt < 0 Compute inverse transform.
Output z The transformed data replaces the input if ier = 0 is
returned. For an inverse complex-to-real transform, the
real result is stored in the real parts of z and the
imaginary parts of z are set to zero.
ier Status response:
ier = 0 Normal return—transform successful.
ier = −1 l1 ≤ 0.
ier = −2 l2 ≤ 0.
ier
= −3 l3 ≤ 0.
ier
= −4 ldz < l1.
ier
= −5 mdz < l2.
ier ≤
−6 Probable error in ldx or mdx.