[R] Element-by-element multiplication

[Jeff Newmiller]

outer( p, a )
-- 
Sent from my phone. Please excuse my brevity.

On May 22, 2016 3:34:31 PM PDT, Jim Lemon <drjimlemon at gmail.com> wrote:
>Hi Steven,
>
>as.data.frame(sapply(a,"*",p))
>
>Jim
>
>
>On Mon, May 23, 2016 at 8:22 AM, Steven Yen <syen04 at gmail.com> wrote:
>> Dear R users:
>>
>>  > # p is a vector if length 10
>>  > # a is a vector if length 3
>>  > # I like to create a matrix with
>>  > # the first  column being p multiplied by a[1]
>>  > # the second column being p multiplied by a[2]
>>  > # the third  column being p multiplied by a[3]
>>  > # The following would do that:
>>  >
>>  > a<-c(10,100,1000); a
>> [1]   10  100 1000
>>  > p<-matrix(1:10,nrow=10); p
>>        [,1]
>>   [1,]    1
>>   [2,]    2
>>   [3,]    3
>>   [4,]    4
>>   [5,]    5
>>   [6,]    6
>>   [7,]    7
>>   [8,]    8
>>   [9,]    9
>> [10,]   10
>>  > cbind(a[1]*p,a[2]*p,a[3]*p)
>>        [,1] [,2]  [,3]
>>   [1,]   10  100  1000
>>   [2,]   20  200  2000
>>   [3,]   30  300  3000
>>   [4,]   40  400  4000
>>   [5,]   50  500  5000
>>   [6,]   60  600  6000
>>   [7,]   70  700  7000
>>   [8,]   80  800  8000
>>   [9,]   90  900  9000
>> [10,]  100 1000 10000
>>  >
>>  > # Gauss does it easily with an element-by-element
>>  > # multiplicationa.*p
>>  > # How can I do this in R?
>>  >
>>
>>
>>         [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
>______________________________________________
>R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.

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