filter_features: Filter a matrix with counts
In leandroroser/RNASeqFunctions: Several functions for rna-seq analysis

Filter a matrix with counts

1 2	filter_features(x, method = c("counts", "cpm"), min_value, thres_samp, groups = NULL, at_least_one = TRUE)

`method`	Method used for the filter: counts or cpm
`min_value`	minimum value of counts or cpm
`thres_samp`	minimum number of samples with min_value counts
`at_least_one`	if at least one treatment meet the requirements, the feature is not removed if treatment is passed. If FALSE, all the treatmens must meet this requirement
`treatment`	factor with treatment for each sample. If this parameter is passed, the filter condition is verified for each treatment (and not overall)