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expr
The expression to be converted.
Convertsan expression to double-precision floating-point data type.
Extracts data from an expression and places it in a double-precision floating-point scalar or array.
The expression to be converted.
The expression from which to extract data.offset
The offset, in bytes, from the beginning of expr to where the extraction is to begin. dimi
(optional) The dimensions of the result. May be any scalar expression. Up to eight dimensions may be specified.
A copy of expr converted to double-precision floating-point data type.
If offset is used, DOUBLE does not convert result, but allows fields of data extracted from expr to be treated as double-precision floating-point data. If no dimensions are specified, the result is scalar.
a = INDGEN(6) PRINT, a
0 1 2 3 4 5
b = DOUBLE(a)
.
INFO, b
B DOUBLE = Array(6)
PRINT, b
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000 5.0000000
c = DOUBLE(b, 16, 2, 2)
INFO, c
C DOUBLE = Array(2, 2)
PRINT, c
2.0000000 3.0000000
4.0000000 5.0000000
NOTE: If you want to place the double-precision value of a constant into a variable, it is more efficient to use the d or D constant notation rather than the double function. For example:
For more information on using this function to extract data, see the PV-WAVE Programmer's Guide.
