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Re: Turning off math error checking for a code block [message #28964 is a reply to message #28898]

Fri, 18 January 2002 15:30

bowman
Messages: 121
Registered: September 1991

Senior Member

Well, it makes more sense if both blocks of code do the same work. ;-)

Turning off error checking is still faster, though.

Turn off error checking, t = 0.45098495
Do WHERE twice, t = 2.5393230

Ken

PRO TEST_FINITE

n = 1024L*1024L
nmiss = 100L*1024L
x = RANDOMN(seed, n) ;Create 10^ random numbers
miss = LONG(n*RANDOMU(seed, nmiss)) ;Generate 10^5 random indices
x[miss] = !VALUES.F_NAN ;Set random indices to missing
x_min = 0.0

t = SYSTIME(/SECONDS)
error = CHECK_MATH(/PRINT)
save_except = !EXCEPT
!EXCEPT = 0
i = WHERE(x LT x_min, ni)
IF (ni GT 0) THEN x[i] = !VALUES.F_NAN
error = CHECK_MATH()
!EXCEPT = save_except
PRINT, 'Turn off error checking, t = ', SYSTIME(/SECONDS) - t

t = SYSTIME(/SECONDS)
i = WHERE(FINITE(x), ni)
IF (ni GT 0) THEN BEGIN
y = x[i]
j = WHERE(y LT x_min, nj)
IF (nj GT 0) THEN BEGIN
y[j] = !VALUES.F_NAN
x[i] = y
ENDIF
ENDIF
PRINT, 'Do WHERE twice, t = ', SYSTIME(/SECONDS) - t

END

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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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