Error in aggregateFeatures

[yafeng]

Hi,
i got en error while using aggregateFeatures command from MSqrob2.
pe <- aggregateFeatures(pe,i = "peptideNorm", fcol = "PG.ProteinGroups", na.rm = TRUE, name = "protein")

Error in contrasts<-(*tmp*, value = contr.funs[1 + isOF[nn]]) :
[: contrasts can be applied only to factors with 2 or more levels]

Could you point out how i should fix the error? I guess it is related to my input, but i don't know where to start.
Thanks for your help!

Yafeng

[hassansaei]

Hi, i got en error while using aggregateFeatures command from MSqrob2. pe <- aggregateFeatures(pe,i = "peptideNorm", fcol = "PG.ProteinGroups", na.rm = TRUE, name = "protein")

Error in contrasts<-(*tmp*, value = contr.funs[1 + isOF[nn]]) : [: contrasts can be applied only to factors with 2 or more levels]

Could you point out how i should fix the error? I guess it is related to my input, but i don't know where to start. Thanks for your help!

Yafeng

Hi,
I faced the same issue and I figured out I had blanks and NAs in my intensity columns. I removed the blanks and performed aggregateFeatures function and it worked. Here is the example:

pep <- read.table(peptidesFile, sep = "\t", header = T)
pep <- pep %>%
mutate(Proteins = ifelse(Proteins == "", NA, Proteins)) %>%
mutate(Intensity.A = ifelse(Intensity.A == "", NA, Intensity.1C3_d37_ECM_R1)) %>%
filter(Proteins != "NA") %>%
filter(Intensity.A != "NA")

I hope this helps.
Hassan Saei