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Bug in NR_QROMB? [message #3522]

Sun, 05 February 1995 12:49

mallozzi
Messages: 60
Registered: August 1994

Member

Hi all,
I needed to compute an integral, and the integrand itself contained a
second integral, so I wrote a simple program to test this case using
the IDL-supplied NR_QROMB. In order to use NR_QROMB, you must write a
function that contains the integrand, and then you call NR_QROMB with this
function name as a parameter. In my case, within my first function, I
placed another call to QROMB to evaluate the inner integral (this is not a
double integral), the result of which becomes part of the first integrand.

If I make BOTH calls to NR_QROMB in single or double precision, I get the
wrong result. If I make one call single and the other call double, I get
the correct result. Does anyone know what is happening?

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[Message index]

		Bug in NR_QROMB? By: mallozzi on Sun, 05 February 1995 12:49
		Re: Bug in NR_QROMB? By: steinhh on Wed, 08 February 1995 02:34

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