Back to Alphabetical List


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