[R] Why does 'apply(.., 1, .., ..)' transpose result

[Charles C. Berry]

On Fri, 23 Apr 2010, Worik R wrote:

> I am sorry if this is documented in apply's dcumentation or completely
> obvious, I could not find or work it out.

Well, try

 	?apply

and focus on the 'Value:' section, first para.

To me, that behavior seems consistent with other functions in 
the [tslm]apply family.

Perhaps you want sweep(). See

 	?sweep

HTH,

Chuck


>
> Given an matricies Q: 2x3, R:1x3 and S:1x2
>
> apply(Q, 1, '-', R) is 3x2 and apply(Q, 2, '-', S) is 2x3
>
> Why?
>
> cheers
> Worik
>
>> Q
>     [,1] [,2] [,3]
> [1,]    1    2    3
> [2,]   10   11   12
>> R
> [1] 1 4 7
>> S
> [1] 1 4
>> apply(Q, 1, '-', R)
>     [,1] [,2]
> [1,]    0    9
> [2,]   -2    7
> [3,]   -4    5
>> apply(Q, 2, '-', S)
>     [,1] [,2] [,3]
> [1,]    0    1    2
> [2,]    6    7    8
>>
>
> 	[[alternative HTML version deleted]]
>
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Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901