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In addition to the standard transformations and conversions accessible within the ‘Transformations’ option, users can save and retrieve up to 40 custom transformations. These use the mathematical operations available as standard transformations (e.g., absolute values, exponentiation, square roots, division, multiplication, polynomials, etc.) but the user can ‘pre-load’ them with specific numeric coefficients. This can be handy if, for example, one needs to repeatedly apply a polynomial conversion to the output of a particular instrument. When selected from the EDIT menu, the custom transforms window looks like this:
To use a custom transformation, select the desired transform from the list in the window. Edit the channel label if appropriate, and click the ‘Apply To Active Channel' button. The main window should then be updated to show the applied transformation.
NOTE: when custom transforms are selected from the EDIT menu, they apply ONLY to the current active channel, and affect all data in that channel. Also, only single-channel operations are allowed -- no adding, subtracting, multiplying, etc. of two channels. Finally, scripting is unavailable. If you want to use any of these options, or transform only a selected block, go to the standard Transformations window and access custom transforms from there.
Custom transformations can be accessed, edited, deleted, and run from the EDIT menu, but can only be created from within the standard Transformations window. To do this, set up the transformation as you would normally (i.e., select the mathematical operation and supply the correct coefficients). Then select ‘Add new custom transform’ from the ‘Custom transformations’ popup. A window will open asking for a name for the new transformation; you can enter anything you like, up to a maximum of 40 characters.
• NOTE: At present, the custom transformations options do not work for ‘breakpoint’ conversions.
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