read4b fortran file binary read x=read4b(file-name,m,n [,rec]) file-name string or integer m, n integers (dimensions of the matrix x). Set m=-1 if you do not know the numbers of rows, so all the file is read rec vector of positive integers. the selected records for direct access. This vector size must be equal to the number of rows of desired x. binary read of the matrix x in the file file-name. Matrix entries are supposed to have been stored on 4 byte words. For direct record access, file must have been previously opened using file function to set the record_length. file-name must be the result of the file function. file write writb mget write4b