Nonlinear Curve Fitting

JIRA	Summary	Detail
ORG-9545	Incorrect Standard Error for Parameters of Voigt Fitting Function	When x is large, it can produce a big standard error for xc. Voigt uses numeric derivative, and improper step size can cause a big standard error. In 9.1, it changes the step size to avoid this problem.
ORG-8458	None Ordered Growth/Decay Constants When Fitted With Exponential Functions	In 9.1 when fit multiple processes with exponential growth or decay functions, growth or decay constants will be sorted accordingly. For example in ExpDec 3 function, fitted parameters will be ordered as t1<t2<t3.
ORG-8878	Message Tab	Previously, NLFitting dialog always switches to message tab. In 9.1, it always stays at current tab, only switches to message tab when reporting critical errors.
ORG-8558	Customized NLFit dialog and want to see fitted curve when doing fit 1 iteration at a time	1. Run the following code to plot a scatter graph fname$=system.path.program$ + "Samples\Curve Fitting\gaussian.dat"; // prepare data newbook; impasc; plotxy (1,2); 2. Run the following script, and we could curve fit and got the result. nlbegin 1 gauss tt; nlpara 1; nlfit; nlend 1; --> NLFit dialog opens with nlpara 1 command. 3. Click “ 1Iteration” button or Fit till converged, --> Parameter values update on Parameter tab. ==> But the fitted curve doesn’t change in graph. We want that the fit curve in the graph changes when parameters are updated in the dialog.

Fit Comparison

JIRA	Summary	Detail
ORG-8771	Missing Value Altering Results of Fit:Comparison Dataset	In 9.1, missing value in the end of x column won't affect the result of Fitting Comparison. Incorrect result existed in SR1 and later version of 9.0.

JIRA	Summary	Detail
ORG-9356	Expand/Collapse on Report Sheet Not Act on Individual Table	Previously, when right click to select expand/collapse on report sheet, it would act on all the tables. In 9.1, it's fixed to act on individual table as selected.

JIRA	Summary	Detail
(ORG-8284) (ORG-7939)	Repeat Analysis Failed to Fix Fixed Parameters	9.1 is able to remember fixed parameters settings. Besides, repeat analysis can remember customized data range.
(ORG-7878)	Repeat Analysis to All Y Columns Not Keep Weighting Method	9.1 is able to copy weigh method when repeat analysis