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Re: what is Floating illegal operand question? [message #43692 is a reply to message #43691] Mon, 18 April 2005 13:49 Go to previous messageGo to previous message
Michael Wallace is currently offline  Michael Wallace
Messages: 409
Registered: December 2003
Senior Member
lixiaoyao wrote:
> when I run this code in idl,it generated the following wrong
> information,what is
> wrong there?
> % Compiled module: $MAIN$.
> % Program caused arithmetic error: Floating illegal operand
> window,xs=640,ys=480
> x=10*!pi*findgen(1001)/1000
> sn=sin(x)/x
> plot,x,sn
> end
> thanks
>

You're getting it from a floating point divide by zero. When using
integers, IDL actually tells you that you tried to divide by zero. For
some reason, they have a different message for floating point.

IDL> x = 0 / 0
% Program caused arithmetic error: Integer divide by 0
IDL> x = 0.0 / 0.0
% Program caused arithmetic error: Floating illegal operand

-Mike

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