Re: [R] creating matrices from vectors

I think this approximates what you want: a1 <- 1:10 a2 <- a1 + 100 a3 <- a1 + 200 a4 <- a1 + 300 arr <- rbind(a1, a2, a3, a4) dim(arr) <- c(2, 2, 10) apply(arr, 3, function(x) eigen(x)$values[2]) Patrick Burns [EMAIL PROTECTED] +44 (0)20 8525 0696 http://www.burns-stat.com (home of S Poetry and

Re: [R] creating matrices from vectors

James Rudge wrote: If I have 4 vectors (a, b, c, and d) each of length 1000, how do I then create 1000 two by two matrices from these vectors, such that: myMatrix[i] = matrix(c(a[i],b[i],c[i],d[i]),2) Then I'd like to create a single vector containing the largest eigenvalues of each matrix

[R] creating matrices from vectors

If I have 4 vectors (a, b, c, and d) each of length 1000, how do I then create 1000 two by two matrices from these vectors, such that: myMatrix[i] = matrix(c(a[i],b[i],c[i],d[i]),2) Then I'd like to create a single vector containing the largest eigenvalues of each matrix? (Sorry I am quite