MEMND: ND Maximum Entropy Calculation.
-ndim [1] Number of Dimensions.
-sigma [1.0] Std Dev of Time-Domain Noise;
Use Zero for Auto Estimates.
-zf [2] Zero Fill (Power of 2);
(also use -xzf -yzf etc).
Reconstruction Mode Flags:
-neg Two Channel (+/-) MEM (Default).
-pos Positive-Only MEM.
-zero Correct Zero Order Offset (Default).
-nozero Suppress Offset Correction.
-freq Output Freq-Domain Result (Default).
-time Output Time-Domain Result.
Convolution Parameters (also use -x.. -y.. etc);
defines window used on MEM data:
-conv cFn [None] Convolution Func: EM GM SP.
-cQ1 cQ1 Convolution Parameter Q1.
-cQ2 cQ2 Convolution Parameter Q2.
-cQ3 cQ3 Convolution Parameter Q3.
Deconvolution Parameters (also use -x.. -y.. etc):
defines inverse window used on original data:
-deco dFn [None] Deconvolution Func: EM GM SP.
-dQ1 dQ1 Deconvolution Parameter Q1.
-dQ2 dQ2 Deconvolution Parameter Q2.
-dQ3 dQ3 Deconvolution Parameter Q3.
Data Clipping and Scaling:
-ts tsMode [0] Time-Domain Scaling Mode:
0=None 1=Divergence 2=Always.
-clip cMode [0] Freq-Domain Clipping Mode:
0=None 1=Pos 2=Neg 3=Both.
-min cMin [-1e17] Minimum for Clipping.
-max cMax [+1e17] Maximum for Clipping.
MEM Parameters:
-alpha [1e-3] Scale for MEM Update.
-tScale [0.5] Scale for Amplification Threshold.
-tLimit [1.5] Chi Limit for Use of Threshold.
-cScale [1e2] Desired Sigma After Scaling.
-eScale [1.0] Scale (A) for Entropy Calc.
-lamb [1e-5] Initial/Minimum Lambda Value.
-step [0.02] Scale for Lamda Update.
-x0 [5.0] Second-Order MEM Threshold.
Convergence Tests:
-cLim [1.0] Chi-Square/N Limit for Convergence;
(same as old option -zFact)
-zLim [1.0] Z-Statistic Limit For Convergence.
-itmax [50] Maximum Iteration Count.
-itmin [3] Minimum Iteration Count.
-div [3] Maximum Divergence Count.
-report [0] Report Level:
0=No Report 1=Final Iteration
2=Each Iteration 3=Save F and dC
Notes:
1. Important options are -ndim -sigma and -alpha.
2. Underestimate time noise value for -sigma to
avoid missing peaks.
3. Use a minimum of 2 zero fills (size*4).
4. Use -report 2 for statistics of each iterate.
5. Reduce -alpha value if results diverge.
6. Chi/N statistic should decrease to 1.0 in a
good reconstruction.
7. MEM Z statistic should increase to 1.0 in a
good reconstruction, but values as small as 0.1
are not unusual.
