- #1

#### member 428835

Hi PF!

Attached are two plots of the same function, one uses a parameter ##a=89.9## and the other uses ##a=89+9/10##. As you can see both functions are very different. Also, using NIntegrate over each gives two different outputs respectively, ##-6.91846*10^{12},-6.91949*10^{19}##.

My question is, how do I know if either is right, and if so which one? I'm obviously leaning towards the non-floating point ##a=89+9/10## as the more correct, but how do I know this integral is even right at all?

Are there other numerical integration strategies I should look at besides NIntegrate?

Attached are two plots of the same function, one uses a parameter ##a=89.9## and the other uses ##a=89+9/10##. As you can see both functions are very different. Also, using NIntegrate over each gives two different outputs respectively, ##-6.91846*10^{12},-6.91949*10^{19}##.

My question is, how do I know if either is right, and if so which one? I'm obviously leaning towards the non-floating point ##a=89+9/10## as the more correct, but how do I know this integral is even right at all?

Are there other numerical integration strategies I should look at besides NIntegrate?