Added features for `Percent_Expressing`

[samuel-marsh]

• [ ] Support for setting individual expression thresholds for each feature supplied
• [ ] Support for quantifying cells expressing two or more features simultaneously

[denvercal1234GitHub]

Hi @samuel-marsh - This is quite a useful helper function. I was wondering if you could elaborate on how the function determine if a cell is considered positive here? Is it just if it has normalised expression > 0? Thank you!

Update: threshold: Expression threshold to use for calculation of percent expressing (default is 0).

[samuel-marsh]

@denvercal1234GitHub yes with default settings that is correct. This can be modified by altering the threshold parameter or the layer used for calculation. https://samuel-marsh.github.io/scCustomize/reference/Percent_Expressing.html

Best, Sam