CODEWITHSUNDEEP
rmatrix
user308827
user308827

Reputation: 21971

Read in matrix without row and column names in R

I would like to read in the following matrix in R, but then discard the row and column names:

    A       B       C       D
A   0       4562    50714   882
B   5718    2302    47      26
C   72055   82      5889    215
D   1930    41      85      396

I do this:

matrix1 <-read.table("matrix_min.csv", header=T, sep=",")
m <- as.matrix(matrix1)

However, the resulting 'm' still has the row and column names. How do I get rid of them?

For some reason, on reading in the file using 

matrix1 <-read.table("matrix_min.csv", header=T, sep=",")
m <- as.matrix(matrix1,row.names=0,col.names=0)
rownames(m) <- colnames(m) <- NULL
print(m)

produces:

     [,1] [,2]    [,3]   [,4]    [,5] 
[1,] "A"  "    0" "4562" "50714" "882"
[2,] "B"  " 5718" "2302" "   47" " 26"
[3,] "C"  "72055" "  82" " 5889" "215"
[4,] "D"  " 1930" "  41" "   85" "396"

Upvotes: 1

Views: 20058

Answers (1)

flodel
flodel

Reputation: 89057

You need to use header = TRUE and row.names = 1 to read in the first row and first column as dimension names.

dat <- data.matrix(read.csv("matrix_min.csv", header = TRUE, row.names = 1,
                           sep = ","))

Then, as suggested in the comments, use dimnames<- to remove the dimension names:

dimnames(dat) <- NULL

Upvotes: 9

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