Practical IDL Programming

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 ...