| T O P I C R E V I E W |
| snnujj |
Posted - 05/27/2006 : 09:43:29 AM
I'm trying to carry out the deconvolution of one peak into three Gaussian peaks. When I execute the menu of multiple Gaussian fitting, the first window is the half-width estimate. After I choose the default estimate, I determine the x-positions of three peaks by double click. For example, I choose the positions of x=480 x=510 and 520. After carrying out fitting, the peak is deconvoluted into three Gaussian peaks nicely.
But, it has one serious problem for me. The positions of three deconvoluted peaks are somewhat different from the initial positions I determined. For example, the final positions are 496¡¢516 and 526 and the fitted peak at 526 is not alone y but alone -y . I would like to let the initial position value remain constant. The deviation is larger so I don't want the initial value to change. How can I do? If you have a knowledge on this problem, I would like you to let me know. Thank you for reading and helping!
My Email: snnujj@yahoo.com.cn
Edited by - snnujj on 05/27/2006 10:29:25 AM |
| 3 L A T E S T R E P L I E S (Newest First) |
| Mike Buess |
Posted - 05/28/2006 : 08:26:25 AM
Multiple-peak fits can be tricky. You'll probably need to provide reasonable starting values for all parameters.
Mike Buess
Origin WebRing Member |
| snnujj |
Posted - 05/27/2006 : 10:38:17 PM
But that dialog ("Attention¡ªError! Parameters are not properly initialized.Check their values " ) come out when i click the 10 Iter. button .what should i do? i cann't fit a curve fixed parameters using" advanced fitting tool...".May you teach me to use it? I need your help.Thanks a lot!
Edited by - snnujj on 05/27/2006 11:56:58 PM |
| Mike Buess |
Posted - 05/27/2006 : 10:13:56 AM
1. Run Analysis > Fit Multi-Peaks > Gaussian once again.
2. Select Analysis > Non-linear Curve Fit > Advanced Fitting Tool.
3. The parameters for your 3-peak fit should be showing in the Nonlinear Curve Fitting dialog. Set xc1, xc2 and xc3 to the desired peak positions and uncheck the Vary option to the right of each.
4. Click the 1 Iter or 100 Iter button once or twice.
5. Click Done to get a Results Log readout.
Mike Buess
Origin WebRing Member |
