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Practical IDL Programming by Liam E. Gumley

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P

!p system variable, 234, 235
Page Control Language device (PCL), 194
parameters
argument-passing mechanism for, 113–115
checking input parameters, 118–120
checking output parameters, 122
defining, 111
input, 110, 111, 118–120
optional, 110–111
output, 110, 111–112, 122
overview, 111
positional, 111
using, 111–112
parent widgets, 400
parentheses for arrays, 25
!p.background system variable, 207
PCL (HP Page Control Language) device, 194
PDF (Portable Document Format), 9–10
performance
arrays vs. loops, 24
conserving memory, 135–136
efficient programming, 135–137
operator precedence and array operations, 40–41
timing operations, 137
using efficient methods, 137

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