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Practical IDL Programming by Liam E. Gumley

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D

!d system variable, 235
dangling references, 66
data coordinates for plots
converting, 232–233
map projections and, 281
map_set procedure and, 283
overview, 231
as plots default, 233
data models (HDF), 182–183
data types
arrays and, 18
Boolean operators and, 46–47
conversion functions, 20
conversion in expressions, 35–36
converting between string and numeric types, 22
converting floats to integers, 21
default integer data type, 21
determining for arrays, 68–70
I/O operation error handling, 132
keeping track of variable types, 19
for loop index variables, 102
netCDF, IDL data types supported by, 173
nonnumeric (table), 19
numeric (table), 18
overview, 18–19
for PseudoColor images, 302
true/false definitions, 45
for ...

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