R devel - Jul 2008 - rowSums()/colSums() don't preserve the 'integer' storage mode

Hi,

Wouldn't that make sense to have rowSums()/colSums() to preserve the
storage mode?

m <- matrix(1:15, nrow=5)

 > storage.mode(m)
[1] "integer"

 > storage.mode(sum(m))
[1] "integer"

 > storage.mode(rowSums(m))
[1] "double" <------------------- surprising!

Cheers,
H.

I don't see the cost of doing so paying off.

storage.mode is really only important if you are passing arguments to
compiled code.

If you are passing to compiled code, you really need to ensure the
storage mode is what you think it is, anyway.

Bill Venables.  



-----Original Message-----
From: r-devel-bounces at r-project.org
[mailto:r-devel-bounces at r-project.org] On Behalf Of Herve Pages
Sent: Thursday, 17 July 2008 3:48 PM
To: R-devel at r-project.org
Subject: [Rd] rowSums()/colSums() don't preserve the 'integer'
storage
mode

Hi,

Wouldn't that make sense to have rowSums()/colSums() to preserve the
storage mode?

m <- matrix(1:15, nrow=5)

 > storage.mode(m)
[1] "integer"

 > storage.mode(sum(m))
[1] "integer"

 > storage.mode(rowSums(m))
[1] "double" <------------------- surprising!

Cheers,
H.

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