O

object data type, 3
Object Graphics system, 3
object-oriented programming in IDL, 3
objref data type, 19
offset
computing automatically, 320–322
setting automatically for PS device, 362–368
setting manually for PS device, 360–362
on_error procedure, 130–131
on_ioerror procedure, 132, 154
online help, 9–11
accessing, 9
checking for function names, 23
Contents button, 9
doc_library procedure, 10–11
Index button, 10
manuals, 9–10
for specific topics, 10
See also help procedure
opening files, 148–149
openr procedure
defined, 147
f77_unformatted keyword, 160
format keyword, 152
opening files (read-only), 148–149
swap_if_big_endian keyword, 163
swap_if_little_endian keyword, 163
openu procedure
defined, 147
f77_unformatted ...

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