itype(0..7)

ITYPE is a context which describes the type of data in the image buffer.

For 1D if Itype is 1 then the data-set is considered as complex
(with real and imaginary parts interleaved), if Itype is 0, the
data-set is considered as real.

For 2D data-sets, itype takes values 0 (real) 1 (complex in dim
2, real in dim 1), 2 (complex in dim1, real in dim 2) and 3 (complex
in both dimensions).

For 3D data-sets, itype takes values 0 (real) 1 (complex in dim
3, real in dim 1 and 2), 2 (complex in dim 2, real in dim 1 and 3),
4 (complex in dim 1 real in dim 2 and 3) and the sums for the
combinations.

Itype is normally handled automatically by the program. Changing the
value of Itype DOES NOT CHANGE the data, only what the program
believes they are. When the itype is wrong, use another command
(example FT instead of RFT) or make them real (command REAL).

Results of FT, IFT, RFT, IFTBIS PK->DT, SIMU, SIMUN etc... are
complex. Results from IRFT, FTBIS, MODULUS, REAL (!) etc... are
real. Image from Maximum Entropy Iteration are real.

Linear Prediction package works only on real FIDS. To make real
FID complex,use the sequence RFT IFT.

see also : real ft modulus flip flop

NPK Documentation, version 0.995 - 2009-10-14