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The uv i/o routines need to know what variables change simultaneously.
all variables that have changes simultaneously. Conversely routine
uvwrite assumes that all variables that change simultaneously with
the variables that it writes, have already been written with routine
uvputvr. Hence if the programmer is using uvscan, uvread or
uvwrite, then simultaneity is not a concern, as long as variables are
read after uvscan/uvread, and written before uvwrite. The routine
uvnext provides better control, where this is needed. For an input
file, a call to uvnext causes the next set of variables (which
change simultaneously) to be read. For an output file, uvnext causes
a marker to be written into the data, to indicate that variables written
after the call did not change simultaneously with variables written before
the call.
Last generated by rsault@atnf.csiro.au on 14 Mar 1996