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Commutativity of multiplication [message #50990]

Wed, 25 October 2006 13:24

Sven Geier
Messages: 17
Registered: July 2002

Junior Member

There's something odd afoot with ULong variables (in 6.3) that isn't clear
to me:

IDL> help,f,g,h
F LONG = 500
G ULONG = 1
H FLOAT = 1.00000
IDL> help,f*h,h*f
<Expression> FLOAT = 500.000
<Expression> FLOAT = 500.000
IDL> help,f*g,g*f
<Expression> LONG = 500
<Expression> ULONG = 500

Is this a bug? A feature? Well-known gotcha? Obscure property? Recently
added functionality? Vestigial peculiarity?

- S

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