MagicPlot Manual

Plotting and nonlinear fitting software

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custom_fit_equation [Thu Feb 24 15:11:54 2011]
Alexander
custom_fit_equation [Sat Jan 16 18:42:13 2021] (current)
Alexander
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-====== Specifying Custom Fit Equation (Pro edition only) ======+====== Specifying Custom Fit Equation ======
 To specify custom fit function formula, press ''Add'' button and select ''Custom Equation'' in popup menu. To specify custom fit function formula, press ''Add'' button and select ''Custom Equation'' in popup menu.
  
-Enter your formula in ''y(x)='' text field below. Use ''x'' as fit function argument. See [[formula|formula syntax]].+  * Enter your formula in ''y(x)='' text field below. Use ''x'' as fit function argument. See [[expressions]] for details. 
 +  * You may recall last entered custom fit functions using ''Recently Used Custom'' item in ''Add'' popup menu.
  
-You may recall last entered custom fit functions using ''Recently Used Custom'' item in ''Add'' popup menu.+{{:custom_fit_equation.png?nolink|Custom fit function example}}
  
 ===== Fit Parameters ===== ===== Fit Parameters =====
-You can introduce fit function parameters with any names (except argument ''x'', and constants like ''e'', ''pi'', etc, full list:  [[formula#constants|predefined constants]]):+You can introduce Fit Curve parameters with any names except argument ''x'', and constants like ''e'', ''pi'' (see [[expressions#constants|predefined constants]] for details):
   * Parameters names are case-sensitive (''a'' and ''A'' are different parameters).   * Parameters names are case-sensitive (''a'' and ''A'' are different parameters).
   * Parameters names lengths are not limited.   * Parameters names lengths are not limited.
   * Begin names with letter or ''_'' sign. You can use numbers in the middle or in the end of the name: ''a1, a_1, A1, a1t'', but the names like ''1a'' are not allowed.   * Begin names with letter or ''_'' sign. You can use numbers in the middle or in the end of the name: ''a1, a_1, A1, a1t'', but the names like ''1a'' are not allowed.
  
-The parameters you introduce will automatically and immediately occur in parameters list, you do not need to enter parameters names in the list manually.+The parameters you introduce in formula will automatically and immediately occur in parameters list, you do not need to enter parameters names in the list manually. Random values are used as the initial values of parameters. Do not forget to set more relevant initial values, otherwise fit algorithm may fail.
  
-Random values are used as the initial values of parameters. Do not forget to set more relevant initial values, otherwise fit algorithm may fail. +===== Adjusting Parameters with Mouse Wheel ===== 
- +You can adjust Parameters in table using mouse wheel scrolling when mouse cursor is on the desired parameter: Hold Ctrl key (Cmd key on Mac) and scroll. If Shift key is also pressed the parameter step for one wheel 'click' will be increased. 
-===== Parameters Adjusting with Mouse wheel ===== +
-You can adjust Parameters in table using mouse wheel scrolling when mouse cursor is located under desired parameter: Hold Ctrl key (Cmd key on Mac) and scroll. If Shift key is also pressed the parameter step for one wheel 'click' will be increased.  +
- +
-{{:custom_fit_equation.png|Custom fit function example}}+
  
 ===== See Also ===== ===== See Also =====
custom_fit_equation.1298549514.txt.gz · Last modified: Sun Nov 8 12:20:32 2015 (external edit)