c(), rbind and cbind functions - why type of resulting object is double

I was wondering
why I don't get an integer vector or and integer matrix with the following
code:

z <- c(1, 2:0, 3, 4:8)
typeof(z)

[1] "double"

It is because the literals 1 and 3 have type "double".  Append "L" to make
them literal integers.

   > typeof(c(1L, 2:0, 3L, 4:8))

   [1] "integer"
The colon function (":") returns an integer vector if it can do so without giving
a numerically incorrect answer.

   > typeof(1.0:3.0)

   [1] "integer"

   > typeof(1.5:3.5)

   [1] "double"

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf
Of Lourdes Pe?a Castillo
Sent: Tuesday, January 22, 2013 9:26 AM
To: r-help at r-project.org
Subject: [R] c(), rbind and cbind functions - why type of resulting object is double

Hello Everyone,

I am using R 2.15.0 and I came across this behaviour and I was wondering
why I don't get an integer vector or and integer matrix with the following
code:

z <- c(1, 2:0, 3, 4:8)

typeof(z)

[1] "double"

z <- rbind(1, 2:0, 3, 4:8)

Warning message:

In rbind(1, 2:0, 3, 4:8) :

   number of columns of result is not a multiple of vector length (arg 2)

typeof(z)

[1] "double"

z <- matrix(c(1, 2:0, 3, 4:8), nrow = 5)

typeof(z)

[1] "double"


Shouldn't be typeof integer? According to the online help if everything is
integer the output should be integer.
But if I do this, I get an integer matrix.

z <- matrix(1:20, nrow = 5)

typeof(z)

[1] "integer"

Thanks!

Lourdes

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