Identify Columns Index Matching Given Vector of String
10,163
Solution 1
try
which(colnames(sample_matrix) %in% x)
Solution 2
What you are looking for is %in%
as in:
which(colnames(sample_matrix) %in% x)
Or, alternatively, match
match(x, colnames(sample_matrix))
Solution 3
Also:
grep("^a$|^b$", colnames(sample_matrix) )
Using grep is often more general that testing for presence in a string of values. You can get all the items that match a pattern, say all names that begin with "a".
Author by
user1234440
asking the right questions while providing no help to others
Updated on June 16, 2022Comments
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user1234440 about 2 years
I've got a vector of string
x<-c('a','b')
and I have an matrix with multiple columnsl; which contains names in that vector of string. I would like to get the column numbers/index which matches their names.
which(colnames(sample_matrix) == x)
This above works when x is not a vector but a single element. Any solutions?