search for: correcponding

Hi, I have a 4D data file from MATLAB, call it X, that I want to analyze in R. The first 3 dimensions are x y z coordinates and the forth is a value in time. If you took a sample vector in matlab it would look like vec1 = X(x1, y1, z1, :) vec2 = X( x2, y2, z2, :) this would give you all values (I have 300 of them) corresponding to this (x1,y1,z1) point of X. Now I read the MATLAB datafile 4D

...9380968421-3634004.post at n4.nabble.com> Content-Type: text/plain; charset=us-ascii Hi Sarah, I use readMat function, from R.matlab function. str(X) tells that X : num [1:64, 1:64, 1:21, 1:300] as I said, the first 3 columns are x,y,z coordinates. And I need all values in the last column correcponding to a given (x,y,z) coordinate. if you list the values of X, then they are non zero, but for some reason R tells that dim(X): NULL -- View this message in context: http://r.789695.n4.nabble.com/4D-data-acsess-tp3633552p3634004.html Sent from the R help mailing list archive at Nabble.com. -----...