Dear R-users,
Suppose I have a function which takes three arguments. I would like to repeatedly apply the function, using a matrix N*3 in which each row supplies the three argements for the function. Is this possible? Thank you for your help in advance!
You have a function foo:
> foo
function(x1,x2,x3){x1+2*x2+3*x3}and a 3-column matrix 'm', then do:
> apply(m,1,function(x){foo(x[1],x[2],x[3])})
[1] 1.929147 4.695657 4.378048 2.716041 3.835949 4.177343 2.031089 3.304404
[9] 1.727687 2.204355
The trick here is to write a function(x) in-line to the apply. This function gets one row of the matrix at a time, and calles foo with three args.
You could also write a new function, foo3:
foo3 <- function(v){ foo(v[1],v[2],v[3])}
and then apply that:
> apply(m,1,foo3)
[1] 1.929147 4.695657 4.378048 2.716041 3.835949 4.177343 2.031089 3.304404
[9] 1.727687 2.204355
Baz
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