A cute problem. Is it homework?
Hint: ?outer
(will provide a much simpler solution than those given below)
-- Bert
On Wed, Sep 25, 2013 at 8:34 AM, arun <smartpink...@yahoo.com> wrote:
> Hi,
> You could also try:
> res1<-sapply(y,function(i) {x1<- expand.grid(x,x);fun1<- function(a,op,b){
> f1<- match.fun(FUN=op); f1(a,b)};fun1(x1[,1],i,x1[,2])})
> row.names(res1)<- row.names(res)
> identical(res1,res)
> #[1] TRUE
> A.K.
>
>
>
>
> ----- Original Message -----
> From: arun <smartpink...@yahoo.com>
> To: R help <r-help@r-project.org>
> Cc:
> Sent: Wednesday, September 25, 2013 3:08 AM
> Subject: Re: Computing calculation among two vectors
>
> Hi,
> Try:
> x<- 1:4
> y<- c("*","/","-","+")
> res<-sapply(y,function(i) {x1<-expand.grid(x,x);
> unlist(lapply(paste0(x1[,1],i,x1[,2]),function(u) eval(parse(text=u))))})
> row.names(res)<- as.character(interaction(expand.grid(x,x),sep="_"))
>
> head(res)
> # * / - +
> #1_1 1 1.0 0 2
> #2_1 2 2.0 1 3
> #3_1 3 3.0 2 4
> #4_1 4 4.0 3 5
> #1_2 2 0.5 -1 3
> #2_2 4 1.0 0 4
>
>
> A.K.
>
>
>
> I have two vectors one numeric and another with operand.
>
> Eg: x - 1,2,3,4 and y-"*", "/", "-", "+"
>
> I need to calculate all the possible two combinations in x with
> each of operand in y. As example, 1*2, 1/2, 1-2, 1+2, 1*3, 1/3....
>
> Any help appreciated.
>
> Regards
> Hussain
>
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>
--
Bert Gunter
Genentech Nonclinical Biostatistics
Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
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