r - Print the value corresponding to specific rowname from a matrix

Question

I just have a simple R question. I have a matrix with rownames A,B,C,D

    Values
A      4     
B      5
C     10
D     21

I just want to print or view the value corresponding to specific rowname. Example - The value for rowname B (which is 5)

question from:https://stackoverflow.com/questions/65847259/print-the-value-corresponding-to-specific-rowname-from-a-matrix

Answer 1

You may simply subset by row and column name.

m["B", "Values"]
# [1] 5

---

Data:

m <- structure(c(4L, 5L, 10L, 21L), .Dim = c(4L, 1L), .Dimnames = list(
    c("A", "B", "C", "D"), "Values"))