Running a `/search` is quite expensive, so we do cap the returns at 2000.  Note that this limit is **not** contractual, and subject to change (it has been pretty stable for a while, but we're seeing thousands of new posts a day... we may encounter a tipping point in the future).

In this case, if you want all questions tagged `matlab` [this][1] is a better query.  If you're not using `nottagged` or `intitle` then `/search` is probably  bad fit for you.

  [1]: http://api.stackoverflow.com/1.1/questions?tagged=matlab