using nrow to identify one row

Try 

temp[1,,drop=FALSE]

See ?"[" for the explanation.

Gabor
Hi fellow R-users,

I have run into a problem when trying to identify the number of rows in a matrix. Say we have an arbitrary 5 by 5 matrix called temp:

temp <- matrix(norm(25), nrow=5)

The problem is that nrow(temp[1,]) returns NULL. I would like it to return 1 because in my larger program I am indexing the rows of large matrices according to another variable and I need to test when the resulting matrices have 0, 1 or more rows.

Thanks in advance for any assistance.

Best regards,
Gregory Gentlemen

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Csardi Gabor <csardi at rmki.kfki.hu>    UNIL DGM

using nrow to identify one row

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