"a function for" is correct and usable in written English.
You can use it to describe the purpose of something; for example, "This program has a function for logging user data."
They wanted to deduce a function for it.
A function for computing the feature vector Psi.
Sherpa has a function for evaluating the equivalent width, eqwidth.
A function for interleukin 2 in Foxp3-expressing regulatory T cells.
Siegel, J. M. & Rogawski, M. A. A function for REM sleep: regulation of noradrenergic receptor sensitivity.
An elegant study identifies a function for non-coding RNA transcription in activating neighbouring genes.
But they won't be the level curves of a function for which this is the gradient.
Fat breakdown: a function for CGI-58 (ABHD5) provides a new piece of the puzzle.
A function for computing the argmax over the (kernelized) linear discriminant function.
A function for printing rational numbers completes our implementation of this abstract data type.
A function for computing the argmax over the loss-augmented (kernelized) linear discriminant function.
