Problems with NIntegrate
- To: mathgroup at christensen.cybernetics.net
- Subject: [mg1645] Problems with NIntegrate
- From: Ian.Barringer at brunel.ac.uk (Drib)
- Date: Sat, 8 Jul 1995 04:25:31 -0400
- Organization: Brunel University, Uxbridge, UK
HI,
I have come up against a problem in Mathematica I hope someone
in this group may be able to explain to me.
I have defined a function as follows;
fp[p_]=Sqrt[(x^2-1)/(p^2-x^2)]
which I wish to integrate numerically. This I can do with
integer values of p:
NIntegrate[fp[6],{x,1,6}]
= 5.69279
However, if I set p as a real value, such as:
NIntegrate[fp[6.2],{x,1,6.2}]
I get an inexact arithmetic error, and no answer.
Does anybody know why this is happening, and if it's possible
to repair ?
If the problem was caused by the singularity a x=p then surely
this would effect both integer and real values of p.
I have consulted the manual, but if the answer is in there I can't
find it !
Any help would be gratefully received.
Thanks in advance Ian.
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