R question

Dear Faheem

I have the following question, which is elementary but I am unable to
answer.
In a for(i=10) loop, I am trying to represent the 10 1-dimensional vectors
l1, l2,... l10 by some expression that will run through these values.
ie. soppose I want to add l1 + ... + l10
I could go

x <- 0
for(i in 1:10){ x <- x+ l(i)}

"()" indictes that a function is called.  You can use a expression like
(get(paste( ... ))

Vec1 <- 1:10
Vec1 <- 1:10
Vec2 <- 1:10
Vec3 <- 1:10
 x <- 2
for(i in 1:3) print(x + get(paste("Vec",i,sep="")))

[1]  3  4  5  6  7  8  9 10 11 12
 [1]  3  4  5  6  7  8  9 10 11 12
 [1]  3  4  5  6  7  8  9 10 11 12


A better way might be a Data.frame / matrix representation:

xx <- data.frame(Vec1,Vec2,Vec3)
xx+x

Vec1 Vec2 Vec3
1     3    3    3
2     4    4    4
3     5    5    5
4     6    6    6
5     7    7    7
6     8    8    8
7     9    9    9
8    10   10   10
9    11   11   11
10   12   12   12

This should return x to be the sum of the 10 li's for i from 1 to 10
except of course I'm doing something more complicated.
But l(i) of course does not serve to represent l1 etc? What should I do?

??? Perhaps this includes a useful idea:

x + apply(xx , 2 , sum)

Vec1 Vec2 Vec3
  57   57   57

or:

apply(xx , 2 , function( yy )x + sum(yy))

Vec1 Vec2 Vec3
  57   57   57


Hope this answer will help a bit
Peter

                                    Faheem Mitha,

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