Trouble reimplementing xcorr calculation in Python

[Erik Johnson]

Hello,

I have been trying to implement the xcorr calculation described in "Faster SEQUEST Searching for Peptide Identification from Tandem Mass Spectra" in Python for two days and have not been successful yet. I'm wondering if someone can point me to a more detailed explanation of the calculation or point me to where in the codebase xcorr is calculated? Not being proficient in C++, the little digging I've done in the codebase hasn't turned up much that I've found helpful. Sorry for this potentially annoying question. Any help is much appreciated!

Best,

Erik

[jke...@gmail.com]

Erik,

See if either of these Python xcorr implementations are helpful:

• https://github.com/jke000/xcorr_py
• https://github.com/maccoss/pyXcorrDIA

[Erik Johnson]

Thanks Jimmy. Those are very helpful!