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 IF 
 
 

Used for tests in command.
2 syntaxes are available :

IF test THEN
..commands on several lines
{ ELSIF test2 THEN
..commands }   (eventually many exclusive tests )
{ ELSE	  (default case)
..commands }
ENDIF
The different commands will executed conditionnally on the value of 
the tests. A non-zero value is considered as true.
Permits to construct complex tests in command files.

IF test remaining_of_the_line
execute the remaining_of_the_line conditionally on the value of 
test. It will be executed only if test is true (non zero). The 
remaining of the line can span several lines by using the line 
continuation sign : \
This form can be used at the prompt level, as well as in call-backs, 
for instance in graphic buttons. It is called the one-line IF.

Tests available are :
for numeral : == != < > <= >= 
for strings : s= s!
for combinations: & | !
as well as several tests functions and variables :  exist() eof() 
$arg $c_joined, etc...

IF(in the first syntaxe) ELSIF ELSE and ENDIF should appear alone on 
one line, eventually followed by a comment. There is no limitation 
for the one-line IF.

see also : CONTROLS FOR FUNCTIONS GOTO WHILE

 
 IFT 
 
 

Perform  complex inverse Fourier Transform on data

see also : FT

 
 IFTBIS 
 
 

Perform  inverse of complex-to-real Fourier Transform on data

see also : FT

 
 INCREM 
 
 

Constant used to increment lambda during MaxEnt iteration(0.1 .. 1) 

see also : LAMBCONT LAMBDA MAXENT

 
 INITINPROGRESS 
 
 

INITINPROGRESS n
Presets for n iterations, the progress bar, of the form :
In Progress : 0%....25%....50%....75%....100%
The progress bar is then updated with the INPROGRESS command.

see also : INPROGRESS PRINT

 
 INPROGRESS 
 
 

INPROGRESS i
Displays the progress of the operation in the progress bar, inited 
with the INITINPROGRESS command.

see also : INITINPROGRESS PRINT

 
 INT1D 
 
 

A very crude 1D graphic integrator. The data is replaced by the 
running sum of the previous data. Better integrals will be obtain 
with base-line corrected spectra. The curve can then be optimized 
with BCORR, ADDBASE, etc...
 

see also : INTEG

 
 INTEG 
 
 

INTEG factor slope thres { radius }

 INTEG computes the volume of the peak detected by PEAK. You need to
 use the peak-picker PEAK before to use INTEG. INTEG uses the 
methods
 described for the PARIS method. It first evaluate the extension of
 the current peak, using 3 criteria :
 - factor : the extension stop whenever the level goes below
 inten/factor (where inten is the intensity of the peak)
 - slope : the extension stop whenever the the slope get larger than
 slope/point (0 means whenever it goes up)
 - thres the extension stop whenever the level goes below thres.

 In 2D, an additional parameter is the maximum extension radius for 
each 
 peak, and the extensions are stored in an amoeba file.
  
        INTEG uses the baseline and noise information held in SHIFT 
and
 NOISE, which are computed automatically by EVALN
  
 

see also : INT1D MSKINTEG mskread mskwrite NOISE PEAK SHIFT SIGN_PEAK ZERO_QU

 
 INVF 
 
 

INVF {Fx}
Process data-sets by multiplying by -1 1 point every 2 points. 
Equivalent to taking the conjugated on complex data-sets, or 
hyperconjugated on hypercomplex data-sets. If applied on a complex 
FID, inverses the final spectrum obtained after Fourier transform.
 

see also : FT ITYPE REVERSE REVF

 
 IRFT 
 
 

Perform  inverse real-to-complex Fourier Transform on data

see also : FT

 
 ITER 
 
 

Number of iterations used by all the iterative modules of GIFA : 
MaxEnt with MAXENT or MAXENTCONT . But also LINEFIT and AUTOPHASE

see also : MINITER

 
 ITERMA2 
 
 

ITERMA2 value
internal value for BCORR 3 algorithm

see also : BCORR BCORRP?

 
 ITYPE 
 
 

	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.
	When displaying complex data sets, only the real part is shown on 
the screen.

see also : FLIP FLOP FT MODULUS REAL

 
 IVALUE 
 
 

Constant used to set the initial value of the image (1e-3 .. 1e3) 
Default value is 1.0

see also : MAXENT