why results from trapz cumtrapz and integral are so different

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Meva
Meva 2015-4-7
评论： Meva 2015-4-7
Hi,
I need to integrate numerically 21 functions, some of them are
int_0^x (...) % integrate from zero to x
some of them
int_0^x (int_0^x (...)) % integrate from zero to x
then again integrate from 0 to x
some of them
int_0^1( int_0^x (int_0^x (...))) % integrate from zero to one and then
integrate from zero to x
then again integrate from 0 to x
I have two codes. First one uses cumtrapz for
int_0^x
and trapz for
int_0^1 ( ...
Second one uses integral method (with function handle) for all the integrals above.
The results are amazing! They are very different like ten times bigger or smaller from each other.
Which method is trusted?
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