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spline [Sun Oct 31 21:13:46 2010] Gray |
spline [Fri Feb 25 14:32:09 2011] Alexander |
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====== Using Spline for Baseline Subtraction (Pro edition only) ====== | ====== Using Spline for Baseline Subtraction (Pro edition only) ====== | ||
- | You can use cubic spline to fit and subtract baseline on Fit Plot. To create spline curve click on '' | + | You can use cubic spline to subtract baseline on Fit Plot. To create spline curve click on '' |
- | Do not use splines to subtract baselines which can be fit well enough with line curve (line or constant baseline). You may mistakenly subtract wide peaks using spline. | + | Do not use splines to subtract baselines which can be fit well enough with '' |
===== Editing Spline ===== | ===== Editing Spline ===== | ||
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* Double click on spline curve to add new anchor point | * Double click on spline curve to add new anchor point | ||
* Double click on anchor point to remove it | * Double click on anchor point to remove it | ||
+ | |||
+ | Set '' | ||
{{: | {{: | ||
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===== Fitting with Spline ===== | ===== Fitting with Spline ===== | ||
- | Spline anchor point (//x//, //y//) coordinates are treated as fit parameters so you can perform fitting with spline. Note that the anchor point coordinates will be varied but the number of point will remain. You also can lock some parameters (usually | + | Spline anchor point (//x//, //y//) coordinates are treated as fit parameters so you can perform fitting with spline |
- | + | ||
- | It is recommended to set appropriate fit intervals which contain only baseline | + | |
- | Set '' | + | It is recommended to set appropriate fit intervals which contain only baseline without peaks. In such case '' |
{{: | {{: |