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...gt; PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -- Eik Vettorazzi Universit?tsklinikum Hamburg-Eppendorf Institut f?r Medizinische Biometrie und Epidemiologie Christoph-Probst-Weg 1 4. Obergeschoss, Raum 04.1.021.1 20246 Hamburg Telefon: +49 (0) 40 7410 - 58243 Fax: +49 (0) 40 7410 - 57790 Web: www.uke.de/imbe Webex: https://webteaching-uke.webex.com/meet/e.vettorazzi -- _____________________________________________________________________ Universit?tsklinikum Hamburg-Eppendorf; K...

Hello Eik: Thanks. I do not need to sample. Essentially, I have a do loop which produces 24 vectors of length of some length (say k=300) and 24 matrices of 300x300. Then, I simply need to? take the averages of these 24 vectors and matrices: x=(x1+x2+...+x24)/k y=(y1+y2+...+y24)/k I am just looking for ways to do this in a do loop, which requires initialization (to 0's) of x and y. My

Is there as way to initialize a vector (matrix) with an unknown length (dimension)? NULL does not seem to work. The lines below work with a vector of length 4 and a matrix of 4 x 4. What if I do not know initially the length/dimension of the vector/matrix? All I want is to add up (accumulate)? the vector and matrix as I go through the loop. Or, are there other ways to accumulate such vectors