How to implement string functions using user defined functions

A user–defined function (UDF) is a function provided by the user of a program or environment, in a context where the usual assumption is that functions are built into the program or environment. A function has zero or more parameters. You can use local variables to store intermediate results. The function body consists of Igor operations, assignment statements, flow control statements, and calls to other functions. A function can return a numeric, string, wave reference or data folder reference result. It can also have a side-effect, such as creating a wave or creating a graph. Before we dive into the

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How to implement string functions using user defined functions
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