ModuleFeaturePlot - add split.by option

[ashleshagogate]

I wanted to show the module expression for the modules I built for the mouse cortex split by treatment in the feature plot.

It would be nice to have that option in the function like Seurat's Feature plot.

I tried subsetting the object by treatment and plotting the feature plots for each treatment individually but got an error - "Error in data.frame(..., check.names = FALSE) : arguments imply differing number of rows: 40642, 81300"

[smorabit]

We will work on adding split.by as an option for this function in a future update. For now you can just use Seurat's function instead.