delete column dataframe r code example

Example 1: drop columns by index r

#drop columns by index
df <- mydata[ -c(1,3:4) ]
#drop columns by name
df = subset(mydata, select = -c(x,z))

Example 2: r data frame remove column

df$columnName <- NULL

Example 3: drop a column in r data frame

df <- df %>%
  select(-column_to_drop)

Example 4: remove column from matrix r

# Remove third column - by column number
MyMatrix <- MyMatrix[,-3]

# Remove third and fifth columns - by feeding the matrix a boolean vector
MyMatrix <- MyMatrix[,c(TRUE,TRUE,FALSE,TRUE,FALSE,TRUE)]

Example 5: how to exclude columns in r

> Data$genome <- NULL
> head(Data)
   chr region
1 chr1    CDS
2 chr1   exon
3 chr1    CDS
4 chr1   exon
5 chr1    CDS
6 chr1   exon

Example 6: r remove column by index

DT[, coltodelete := NULL]