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Sometimes it is preferable to treat `1 / 0' as an error
rather than returning a symbolic result. If you pass the symbol
num as the second argument to
that are not constants are treated as errors. The error message
reported is the first
calc-why message if there is one,
or otherwise "Number expected."
A result is "constant" if it is a number, vector, or other object that does not include variables or function calls. If it is a vector, the components must themselves be constants.
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