[R] function and apply

[Kjetil Brinchmann Halvorsen]

jose silva wrote:

>Dear all
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Its very difficult to read your post due to all the blank lines, so I 
cannot really
read it very well, but what about writing your function as (not tried)
 fun <- function(x) c(x[1], ....
or if that doesn't work look into
?mapply

But you should really look into the settings of your mail program!

Kjetil

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>I think my problem is not complicated but I'm having difficulties to solve it.
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>v is a vector: v=c(p1 , p2 , p3 , p4), and f  is a function: f : v -> w , where 
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>w=c(p1 , p2*(1-p1) , p3*(1-p2)*(1-p1) , p4*(1-p3)*(1-p2)*(1-p1))
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>I write the function f as:
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>f<- function(w,x,y,z) {c(w,x*(1-w),y*(1-x)*(1-w),z*(1-y)*(1-x)*(1-w))}
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>f(a,b,c,d) it works well.
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>But now I want to apply f to each row of a data frame with 4 columns:
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>d<-data.frame(a=seq(1,10), b=seq(11,20), c=seq(21,30),d=seq(31,40))
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>t(apply(d,1,f)) is not working?
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>I think each element of each row is not corresponding to w,x,y,z and now I'm lost?
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>Can someone help me?
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>thks
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>J. Silva
>	[[alternative HTML version deleted]]
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-- 

Kjetil Halvorsen.

Peace is the most effective weapon of mass construction.
               --  Mahdi Elmandjra




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