CODEWITHSUNDEEP
rmatrix
user2806363
user2806363

Reputation: 2593

How to convert non-zero element of a sparse matrix to 1?

I have very huge sparse matrix. I need to convert non-zero element of that matrix to 1 and other entries left zero. would someone help me to implement it in R ?

Upvotes: 0

Views: 2265

Answers (2)

Brian Lin
Brian Lin

Reputation: 11

Using the sparse matrices from the Matrix package, I tried both jbaums' and Julien's methods, but I would get the following error in both:

Error in if (any(i < 0L)) { : missing value where TRUE/FALSE needed

I found an alternative method that worked for me, and was very fast:

m <- as(m!= 0, "dMatrix")

m != 0 produces a lgCMatrix, and converting it into a dgCMatrix through the method above will change all the True entries into 1, while leaving the False entries sparse.

If you were wondering how I found this, a similar example was in the R documentation for lsparseMatrix-classes.

Upvotes: 1

Julien D.
Julien D.

Reputation: 58

You could do 

yourMatrix[which(yourMatrix != 0)] <- 1

(What @jbaums propose is also working)

Upvotes: 0

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