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Addmetadata to seurat obj

Dear all,

It is a bit of coding issue. I have Seurat obj seurat.obj.T and in the metadata, a column type contains three levels of arthritis " First arthritis", "Second arthritis" and "Osteoarthritis". I would like to create a another column called group based on the value of the type column by naming First arthritis" to ICI-arthritis and Second Arthritis to ICI-arthritis and Osteoarthritis still = Osteoarthritis. I tried the following codes, but error twice. Could you help check!

seurat.obj.T <- AddMetaData(object = seurat.obj.T, metadata = "group", data = ifelse(seurat_obj@meta.data$type %in% c("First arthritis", "Second arthritis"), "ICI-arthritis", "Osteoarthritis"))

or

seurat.obj.T$group <- ifelse(seurat.obj.T$type %in% c("First arthritis", "Second arthritis"), "ICI-arthritis", "Osteoarthritis")
seurat.obj.T <- AddMetaData(object = seurat.obj.T, metadata = "group")

Thanks in advance.

Kind Regards

seurat
• 1,237 views • link
written by synat.keam • synat.keam

You should include, or specify, the errors that you are getting.

• 0 views • link
written by fracarb8 fracarb8

I fixed it. in case anyone faced the same issue.

seurat.obj.T@meta.data$group <- ifelse(seurat.obj.T@meta.data$type %in% c("First arthritis", "Second arthritis"), "ICI-arthritis", "Osteoarthritis")
• 0 views • link
written by synat.keam • synat.keam

You can do something like below:-

seurat.obj.T@meta.data$group[which(seurat.obj.T@meta.data$type == "First arthritis")] <- "ICI-arthritis"
seurat.obj.T@meta.data$group[which(seurat.obj.T@meta.data$type == "Second Arthritis")] <- "ICI-arthritis"
seurat.obj.T@meta.data$group[which(seurat.obj.T@meta.data$type == "Osteoarthritis")] <- "Osteoarthritis"
• 0 views • link
written by bk11 • bk11

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