ExpressionMatrix methods

[pdichiaro]

After target assignment I created an expression matrix (a 2-dimensional cells x genes tensor).

I need to save it for the following usage with single-cell analysis software packages but ExpressionMatrix methods return these kinds of errors.

matrix.save('expression_matrix')

DataArray.name or Dataset key must be either a string or None for serialization to netCDF files

matrix.save_loom('expression_matrix1')

invalid indexer array, does not have integer dtype: array(<Axes.X: 'x'>, dtype=object)

matrix.save_anndata('expression_matrix2')

invalid indexer array, does not have integer dtype: array(<Axes.X: 'x'>, dtype=object)

[shanaxel42]

Sorry about this @pdichiaro I've opened a PR to fix these issues. Another thing to note is that when saving as a anndata file the filename must end in ".h5" so matrix.save_anndata('expression_matrix2.h5') will work after my changes land.

[pdichiaro]

please let me know when these issues will be fixed. Thanks.