Perhaps she forgot that you have to call the function by putting parentheses 
and arguments after the function name.
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Sent from my phone. Please excuse my brevity.

David Winsemius <dwinsem...@comcast.net> wrote:
>That instance of 's' is a function and you were offering it (multiplied
>by 5) as a data argument to the theta parameter of 'persp'. I can't
>intuit what your reasoning might have been because you haven't
>explained why you thought that would succeed.

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