Scratch Files

      subroutine scropen(tno)
      subroutine scrread(tno,buffer,offset,length)
      subroutine scrwrite(tno,buffer,offset,length)
      subroutine scrclose(tno)

The scratch i/o routines are used to create and read and write from a scratch file containing real-valued data. Here tno is a handle passed back by the open routine, and must be used in all subsequent calls to the scratch i/o routines. Scrread and scrwrite read and write scratch data to/from the real array buffer. Length values are accessed, starting at the offset given by offset (for a scratch file of $N$ real values, offset can vary from 0 to $N-1$).