"John Greenwood" <joh### [at] john-greenwoodcouk> wrote:
> The first parameter of the select function acts as a logic switch but does not
> respond correctly to a boolean variable, thus

This is *what you think* it does, but it is not meant to be a logical switch. It
is a mathematical selection, where two or three specific conditions matter in
functions. Please go and read the manual before you complain about behavior you
just don't understand!

BTW, you can get *what you want* with just a simple mathematical expression,
without any function. How to do that is left as an exercise to the reader.

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