Windows

<Prev Next>

Constants Window

This window allows setting of individual parameters and other options, and is used to control which parameters are floated during the fitting process. To display this window select View, Constants... from the main window.

Click on an item for more information:

Object Selector

This allows you to select the object to be edited. The format is <type of object>:<name of object>

Tree View

This shows the objects being edited; click on an object to select it for editing. Right clicking (or Shift+F10) on an object brings up a popup menu which allows you to copy, paste delete, move and add objects. To add objects either:

1. Right-click on the object above where you want to are add to in the tree view and select "Add new...", and then select the object required. Only objects that can be inserted at that point in the tree will be displayed.
   
2. Right click on a similar entry and select "copy", then right click where you want the new object to be and select "paste". This is often easier  than adding a completely new object as the values of the parameters and settings will be copied to the new object. Note that it is possible to copy and paste between independent copies of PGOPHER should you want to use an object from a completely different file as a starting point

Parameters

This allows you to edit individual parameter values. To edit a value, click on the cell or use the F2 key. For help on the current cell hit F1. The "increment" column is the increment used for calculating numerical derivatives while fitting. If left blank (the default) or negative 0.0001 of the initial value is used. A value of the order of the standard deviation in the parameter is often helpful in stabilizing an otherwise problematic fit.

Settings

This allows you to edit individual settings. To edit a value click on the cell or use the F2 key. For help on the current (highlighted) cell hit F1.

This shows and allows you to edit a comment on current item. The comment is not used elsewhere and there is no limit on the comment length.

Fix all parameters, i.e. set float = "no" for all parameters for all objects in this window.

Cycle through available units (cm^-1, nm,  MHz, Kelvin and eV), converting parameter values as appropriate each time. To convert the interpretation of the parameters without changing the actual values set Units in the Mixture object (Settings) instead.