"Cant use $ in this way in a function"

Try this:

make W_sigma
make datawaveCropped
string bloach = "W_sigma"
wave wbloach=$bloach
datawaveCropped=wbloach

Hope this helps,
Kurt

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These Igor commands will display help topics that discuss the issues involved here:

DisplayHelpTopic "Accessing Global Variables And Waves"
DisplayHelpTopic "Accessing Waves In Functions"

John Weeks
WaveMetrics, Inc.
support@wavemetrics.com

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So $ can only be used when first declaring waves with the "wave" keyword after making them?

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That's right. Or when looking up a pre-existing wave at a time when it will exist.

To be more precise, though, you can use Wave/Z where the /Z means "look up a wave but it's OK for it to not exist". Then use WaveExists() function to find out if the wave reference variable actually refers to a wave.

John Weeks
WaveMetrics, Inc.
support@wavemetrics.com

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