On 09/04/2012 12:32 PM, James Lenihan wrote:
I found this example in an Introductory R book in the chapter on Matrices and
Arrays
You should probably check with the author of the book (there might be an
errata page posted somewhere), but it looks like a typo, in your code or
the original:
The array is
> m
[,1] [,2] [,3] [,4] [,5]
[1,] 0 12 13 8 20
[2,] 12 0 15 28 88
[3,] 13 15 0 6 9
[4,] 8 28 6 0 33
[5,] 20 88 9 33 0
The code is
#returns the minimum value of d[i,j], i !=j and the row attaining
#the minimum, for square symmetric d; no special policy on ties
mind<- function(d) {
n<- nrow(d)
# add a column to identify row number for apply()
dd<- cbind(d,1:n)
wmins<- apply(dd[-n,],1,imin)
# wins will be 2 X n, 1st row being indices and 2nd being values
i<- which.min(wmins[2,])
j<- wmins[1,i]
return(c(d[i,j],i,j))
}
#this finds the location, value of the minimum in a row x
imin<- function(x) {
lx<- length(x)
i<- x[lx] # original row number
j<-which.min(x[(x+1):(lx-1)])
That line doesn't make sense. Putting i in place of the innermost x
would make more sense, but wouldn't work in all cases: if i == lx,
you'll get a garbage answer.
Duncan Murdoch
k<- i+j
return(c(k,x[k]))
}
The result s/b
[1] 6 3 4
I am getting:
Warning messages:
1: In (x + 1):(lx - 1) :
numerical expression has 6 elements: only the first used
2: In (x + 1):(lx - 1) :
numerical expression has 6 elements: only the first used
3: In (x + 1):(lx - 1) :
numerical expression has 6 elements: only the first used
4: In (x + 1):(lx - 1) :
numerical expression has 6 elements: only the first used
I have check my typing a number of times.
Does anyone see an error?
Thanks,
Jim L.
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and provide commented, minimal, self-contained, reproducible code.
