Creating x*y different contigency tables
On 26-09-2012, at 09:59, Loukia Spineli <spineliloukia26 at gmail.com> wrote:
Dear all,
I am trying to construct 25x31 different matrices of 2x2 dimension. Here
is the problem:
we have the following matrix
matrix(c(54+s0,
43+s1, 56-s0, 67-s1), nrow=2, ncol=2, byrow=T)
the values for s0 and s1 are c(0:24) and c(0:31), respectively.
I wrote the following code without the desired results
x<-0:24
y<-0:30
results<-array(matrix(0,nrow=2,ncol=2,byrow=T),dim=c(2,2,25*31))
for(i in 1:25){
for(j in 1:31){
for(k in
1:25*31){
results[,,k]<-array(matrix(c(54+x[i], 43+y[j], 56-x[i],
67-y[j]),nrow=2,ncol=2,byrow=T),dim=c(2,2,25*31))
}
}
}
results
I am trying to figure out what I am missing.
You don't need the third loop for( k in ?
With for loops you can do this
x<-0:3
y<-0:5
mat.start <- matrix(c(54, 43, 56, 67), nrow=2, ncol=2, byrow=T)
mat.start
Nx <- length(x)
Ny <- length(y)
results<-array(matrix(0,nrow=2,ncol=2,byrow=T),dim=c(2,2,Nx*Ny))
k <- 1
for(i in 1:Nx){
for(j in 1:Ny){
results[,,k] <- mat.start + matrix(c(x[i], y[j], -x[i],-y[j]),nrow=2,ncol=2,byrow=T)
k <- k+1
}
}
results
Berend