Function to check if matrix empty or not

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I have a function that returns a matrix. I want to check if the returned matrix is empty or not. How do i check it in R? If it is an integer we can check it by is.null(someinteger). But how do we check the same in case of matrices?

Oct 29, 2018 in Data Analytics by Ali
• 10,450 points
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1 answer to this question.

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here is some question of what is meant by "empty" here but this will test if matrix m has zero length:

length(m) == 0

Regarding initializing a matrix this initializes it to be a 0x0 matrix:

m <- matrix(, 0, 0)

and this initalizes it to be a 1x1 matrix containing NA:

m <- matrix()

and this initializes it to an nr by nc matrix of NA values:

m <- matrix(, nr, nc)
answered Oct 29, 2018 by Maverick
• 10,040 points

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