[R] vectors into a matrix

[varenda44 at gmail.com]

Hello all,


Firstly, thanks a lot for all your efforts,
the cbind function was very useful.

I tried all you told me, but I couldn't make it work in the way I wanted.
I mixed two problems I had, a common mistake.
Sorry if I didn't explain myself good enough.

Here, I post a solution for my problem. 
I wanted to avoid the "while" loop but I've finally used it.
Hopefully it is helpfull for someone else.


CODE:
-------------------------------


# This could be my data:

VD1 <- c(12, 34, 45, 7, 67, 45)
VD2 <- c(23, 12, 45, 67, 89, 90)
VD3 <- c(14, 11, 10, 19, 20, 27)
VD4 <- c(16, 22, 23, 29, 27, 28)


# and this is my objective:
# (in this case it is just for 4 vectors)

AIM <- matrix(c(VD1, VD2, VD3, VD4), nrow=4, byrow=TRUE)
print(AIM)

# but I want to use any number of vectors
# VDx when x goes from 1 to n

n <- 4  # for this case.

# A solution:
# build an empty matrix with the desired number of rows (vectors)
# then with a "while" loop fill each row with each vector.

Final.matrix <- matrix(, nrow=n, ncol=6, byrow=TRUE)
print(Final.matrix)

y <- 1
while (y <= n)
{
  c <- eval(parse(text=(paste("VD", sep="", y))))
  Final.matrix[y,] <- c
  y <- y + 1
}

print(Final.matrix)

# If I set "n" as 12 I will get the example I explained at first 
# then, by using "cbind()" and "1:n" I add the values of the first column
# as many of you suggested to me

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If someone comes up with a way to do this avoiding the loop, I'd be very 
interested to get to know the solution.


Kind regards,

Vilen

Forestry Engineer