Why does the following error occur? How can I make it work?
(%i1) prf1 ( w, s, n ) :=sum ( ( c [ i ] * exp ( -0.5 * w ^ ( 2 * n ) / s ) ), i, -n, n );
(%i2) plot3d ( prf1 ( w, 2, n ), [ w, -1, 1 ], [ n, 1, 2 ] );
Maxima encountered a Lisp error:
Error in PROGN [or a callee]: Expected a LONG-FLOAT
Automatically continuing.
To reenable the Lisp debugger set *debugger-hook* to nil.
Best regards
Philipp
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