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 ABS 
 
 

Computes absolute value of data-sets, Works only on real data-sets 
(itype=0)

see also : MODULUS REAL

 
 ABSMAX 
 
 

	Absolute factor to which scale refers to for displaying and 
plotting. Usually ABSMAX holds the largest point of the data-set, 
but you can set it by hand in order to do absolute plots. ABSMAX is 
recomputed whenever the data is changed.
	You can force the ABSMAX to be recomputed by setting it to zero. 
You can also hampers the recomputation of absmax (which can be VERY 
long (on 3D for instance)) by setting it to a standard value at the 
end of the command line

see also : MAX SCALE

 
 ADD 
 
 

   ADD  name_of_file   -or- ADDC name_of_file
	permits to add to the current data-set the content of the file 
name_of_file, which is in standard format. Works for both 1D, 2D and 
3D data-sets.

see also : ADDDATA ADDH MULT READ

 
 ADDBASE 
 
 

   ADDBASE constant
	Removes a constant to the data. The default value is the value of 
SHIFT (computed by EVALN).

  

see also : EVALN SHIFT

 
 ADDC 
 
 

Equivalent to ADD

see also : ADD

 
 ADDDATA 
 
 

	Add the contents of the DATA buffer to the current data-set. 
Equivalent to ADD but in-memory.

see also : ADD ADDH MAXDATA MINDATA MULT MULTDATA

 
 ADDH 
 
 

   ADDH  name_of_file
	Same as ADD, with H format files.

see also : ADD ADDDATA CONCAT MULT

 
 ADDNOISE 
 
 

addnoise noise seed

add to the current data-set (1D, 2D, 3D) a white-gaussian, 
characterized
by its level noise, and the random generator seed.

see also : EVALN SIMU SIMUN

 
 aide 
 
 

 HELP (COMMAND)
 Type help Name_of_item to get info about a specific command. H can
be used instead of HELP.
Use apropos topic, to find commands name related to a specific
topic.
Use help primer for a first introduction.

see also : apropos

 
 ALERT 
 
 

alert text
Creates a graphic alert box displaying the text. User must click in 
the alert box to continue. Works only if the graphic mode has been 
intialzed by isuing, at least once, a graphic command.

see also : ERROR PRINT

 
 ALGO 
 
 

Context used to describe the current algorithm

Algo is a number of the form       abc
where a, b and, c are the decimal digits.
	c: 0 Gull and Daniel equation for Entropy 
		1 GIFA equation for Entropy 
		2 steepest descent equation is used
		3 conjugate gradient is used
	b: 0 single step iteration
		1 line-maximization using parabolic fit.
		2 : line-maximization using bracketing before parabolic 
fit.
	a: 0 no Wu correction
		1 Wu correction is applied.

 

see also : conjg gad gifa MAXENT

 
 ALPHA 
 
 

alpha a
This context is the angle along the OZ axis by which the cube is 
rotated during a 3D display with the DISP3D/REF3D set of commands

see also : BETA DISP3D GAMA

 
 APPLY 
 
 

APPLY what_to_apply 
	Apply a windowing function to the data-set.
You can apply :
FILTER : applies the filter used during MaxEnt iterations, depends 
on LB, GB, JCONS, FILTER
WINDOW : applies the window used during MaxEnt iterations.

see also : FILTER GB GET JCONS LB PUT SHOW WINDOW

 
 APPROX 
 
 

Used in the BCORR 3 module, to choose the way the baseline is 
estimated.
0 : with ITERMA2 times a moving average filtering on a window of
 size WINMA2.
1 : with a Legendre polynomial approximation of degree DEGRE.
+10 : with a linear interpolation of signal before approximation.
+100 : with an 'elastic effect' that is a rude way to prevent
 from burying the weak lines.

see also : BCORR BCORRP?

 
 apropos 
 
 

 apropos topic
 for GIFA on_line help

 Search the string "topic" in all the help files available

 

see also : HELP

 
 apsl 
 
 

 automatic 1D phase correction
 APSL method
    A.Heuer J.Magn.Reson. 91 p241 (1991)

 uses the data buffer

 you may want to adapt :
   s_wdth : ration of line width to spectral width used for computing phases
   p_wdth : ration of line width to spectral width used for broadening for peak picking
   npk :  minimum number of peaks needed for phasing
   nfrst : the number of peaks used for first approx

 

see also : apsl_cp PH PHASE

 
 apsl_cp 
 
 

 apsl_cp i sz

 computes the phase of the peak centered on i, using +/-sz points
 the phase of the peak is returned as a global variable called $returned
 between -180 and 180
 i  has to be odd !
 used as a routine by the macro apsl

 

see also : apsl

 
 AR->DT 
 
 

AR->DT size n
Extend the data-set up to size points long by predicting the missing 
data points, using linear prediction.
n = 1 : following points predicted -> forward prediction 
n = 2 : previous points predicted -> backward prediction

see also : BURG DT->AR ORDER SVD->AR

 
 AR->RT 
 
 

AR->RT n
Solve the prediction-error polynomial, calculated from the 
autoregressive coefficients. This is the third step of the LP-SVD 
method.
n = 1 : forward coefficients are used to extracted forward roots
n = 2 : backward coefficients are used to extracted backward roots
n = 3 : both set of roots are computed 

see also : AR->RT2 ARLIST ORDER RT->AR SVD->AR

 
 AR->RT2 
 
 

AR->RT2 n
Equivalent to AR->RT, but seems to be more stable for very large 
polynomial.

see also : ARLIST ORDER RT->AR SVD->AR

 
 AR->SP 
 
 

Calculate the modulus of spectrum from the autoregressive Burg 
coefficients. This is the so-called Burg spectrum, (sometimes 
unfortunately called mem spectrum). The spectrum is computed to the 
size of the current 1D buffer size.

see also : DT->AR ORDER

 
 ARLIST 
 
 

ARLIST n i j
list the autoregressive coefficients from entry i to entry j.
n = 1 : forward coefficients
n = 2 : backward coefficients

see also : AR->DT AR->RT RT->AR

 
 AXIS3D 
 
 

axis3d fx   where x is 1, 2, 3, 12, 13, or 123
This context holds the focal length that will be used for computing 
a 3D display with the DISP3D/REF3D set of commands

see also : CHECK3D DISP3D REF3D