assign_ligands_to_celltype erroe message

[wang2034]

Hi,
When I ran: igand_type_indication_df <- assign_ligands_to_celltype(seuratObj,
nichenet_output$top_ligands,
celltype_col = "cell_type2")
I got a error:

Error in h(simpleError(msg, call)) :
error in evaluating the argument 'j' in selecting a method for function '[': comparison of these types is not implemented
In addition: Warning message:
In seuratObj_subset[, seuratObj_subset[[celltype_col]] == celltype] :
Incompatible methods ("Ops.data.frame", "Ops.factor") for "=="

My Seurat object was created using Seurat V5.

[csangara]

Hi,

I think this occurred because the cell type column is a factor. A workaround for now would be to create a new metadata column as a character, as follows:

seuratObj$celltype_char <- as.character(seuratObj$cell_type2)
ligand_type_indication_df <- assign_ligands_to_celltype(seuratObj,
    nichenet_output$top_ligands,
    celltype_col = "celltype_char")

I will implement a fix for this in the next patch.