Hello everyone,

i want to get transcript lengths of my ensembl ids, however this function gives me more than one values for each gene. I want to get the longest length for each gene.

For example for gene ENSG00000006210 i got 3285, 3313, 563 and 5796. How can take just the biggest value?

require(biomaRt)

ensembl=useEnsembl(biomart="genes",dataset="hsapiens_gene_ensembl")   # dataset and database chosen.
datExpr=read.csv("../clustering genes/filtered_reduced_rc.csv",row.names=1) # datExpr file loaded

genes=rownames(datExpr) 

x= getBM(attributes = c('transcript_length'), filters = 'ensembl_gene_id', values = genes, mart = ensembl)