COMPUTE

[SIC\]COMPUTE OutVar OPERATION InVar [Parameters] [/BLANKING Bval [Eval]] Perform operations or transformations on variables that are not directly supported by the array capabilities of the SIC command interpretor. Out- Var is the output variable, InVar the input variable. Outvar must be de- fined beforehand. The following operations are available on INTEGER, REAL and DOUBLE PRE- CISION arrays, regardless of their nature: - MAX MIN MEAN RMS SUM PRODUCT MEDIAN for which InVar is an array of rank 1 to 7 (a 1-D to 7-D array), and OutVar must be an array of lesser rank (i.e., one or more dimension less than InVar, down to a number), AND of identical shape as InVar for the dimensions in common. Example (if A[4,12,2,8] and B[4,12]): COMPUTE B MAX A Sections, implicit transpositions, etc... permitted by SIC are sup- ported. - HISTOGRAM: see subtopic HISTOGRAM for details. Blanking values Bval and Eval allow to ignore values of the Invar array if at Eval from Bval, for these operations only. At least Bval must be passed to option /BLANKING, and default is 0.0 for Eval. SET BLANKING has no effect here since it is a command of the GREG1\ language. In case of no valid result, NaN is returned, or Bval if blanking is en- abled. This may occur in particular when all InVar values are blanked. The following transformations are available: - GATHER Return the list of different input values (see subtopic for details) - RANKORDER Return the ordering of the input values. - INTEGRAL or DERIVATIVE Integral or derivative of the input variable - FFT+ or FFT- Direct or Inverse Fast Fourier Transform: see subtopic FFT for de- tails. - FOURT+ or FOURT- Direct or Inverse Fast Fourier Transform: see subtopic FOURT for de- tails. - COMPLEX Populates the Real and (optionally) Imaginary part of OutVar (com- plex variable) with InVar (real) and (optionally) the Imaginary part by the following (real) variable name. - REAL OutVar = REAL part of InVar. OutVar is Real, InVar is Complex . - IMAG OutVar = IMAGE part of InVar. OutVar is Real, InVar is Complex. - ABS OutVar = AMPLITUDE (InVar). OutVar is Real, InVar is Complex. - PHASE OutVar = PHASE (InVar). OutVar is Real, InVar is Complex. - CMP* operations as in "COMPUTE OutVar CMPMUL InVar1 InVar2". All variables must be complex arrays of identical size. CMPADD: OutVar = InVar1 + InVar2. CMPSUB: OutVar = InVar1 - InVar2. CMPMUL: OutVar = InVar1 * InVar2. CMPDIV: OutVar = InVar1 / InVar2. Miscellaneous operations (see subtopics for details): - EXTRACT - DATE - DIMOF - GAG_DATE - LOCATION - BTEST Test bit values

- COMPUTE EXTRACT
- COMPUTE DATE
- COMPUTE DIMOF
- COMPUTE FFT
- COMPUTE FOURT
- COMPUTE GATHER
- COMPUTE GAG_DATE
- COMPUTE HISTOGRAM
- COMPUTE LOCATION
- COMPUTE RANKORDER
- COMPUTE INTEGRAL
- COMPUTE DERIVATIVE
- COMPUTE BTEST

Gildas manager 2014-07-01