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### D.7.2 `gslint` output

In all cases, if no exception occurs, the result returned is an approximation of the integral of f over the interval from a to b or from the first item of p to the last.

Results may differ in numerical properties depending on the integration method and the tolerance used.

- The `qagp`* and `qagx`* functions use an adaptive algorithm, whereas the `qng`* functions use a faster non-adaptive algorithm suitable only for smooth integrands.
- Faster and maybe more accurate results are obtained for discontinuous or non-differentiable integrands by the `qagp`* integration methods if the interior points in p are chosen to coincide with the discontinuities or corners.
- Larger tolerances are conducive to faster but less accurate results in most cases.

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