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Turning off math error checking for a code block [message #28898]

Thu, 17 January 2002 08:26

k-bowman
Messages: 12
Registered: December 2001

Junior Member

I have an array x that is likely to have missing values in it, indicated by NaN's. I would like to search the array for values less than x_min. Because of the NaN's, WHERE generates a floating point error, e.g.,

IDL> print, x
0.00000 NaN 2.00000 3.00000
IDL> print, where(x lt 2.0)
0
% Program caused arithmetic error: Floating illegal operand

As best I understand the interaction between !EXCEPT and CHECK_MATH, in order to suppress this error message, while still checking errors elsewhere in the code, I must do the following:

error = CHECK_MATH(/PRINT) ;If any errors have occurred, print
save_except = !EXCEPT ;Save current exception flag
!EXCEPT = 0 ;Set exception flag to 0
i = WHERE(x LT x_min, ni) ;Find all x < x_min
error = CHECK_MATH() ;Clear accumulated error status
!EXCEPT = save_except ;Restore exception flag

Am I making this harder than it needs to be?

Ken

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[Message index]

		Turning off math error checking for a code block By: k-bowman on Thu, 17 January 2002 08:26
		Re: Turning off math error checking for a code block By: bowman on Fri, 18 January 2002 15:30
		Re: Turning off math error checking for a code block By: k-bowman on Fri, 18 January 2002 14:47

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