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expr
The expression to be converted.
Converts an expression tobyte data type.
Extracts data from an expression and places it in a byte 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. If present, causes BYTE to extract data, not convert it.dimi
(optional) The dimensions of the result. May be any scalar expression. Up to eight dimensions may be specified.
result
A copy of expr converted to byte data type. The result has the same size and structure (scalar or array) as expr.For extracting data:
result
A copy of only part of exprthe part that is defined by the offset and dim input parameters. The result has the size and structure of the specified dimensions and is of the byte data type. If no dimensions are specified, the result is scalar.
for example, in hexadecimal math, when you want to be certain that you are working with a byte value to ensure that any comparison you make is valid.If expr is of type string, each character is converted to its ASCII value and placed into a vector. In other words, each vector element is the ASCII character code of the corresponding character in the string.
If expr is not of type string, then expr is converted to byte data type. The result is expr modulo 256.
TIP: Use BYTSCL to convert expr to byte data type using scaling rather than modulo.
CAUTION: If the values of expr are within the range of a long integer, but outside the range of the byte data type (0 to +255), a misleading result occurs without an accompanying message. For example,BYTE(256)erroneously results in 0. If the values of expr are outside the range of a long integer data type, an error message may be displayed.
a = BYTE('01abc')
INFO, a
A BYTE = Array(5)
PRINT, a
48 49 97 98 99
a = BYTE(1.2) PRINT, a
1
a = BYTE(-1) PRINT, a
255
For more information on using this function to extract data, see the PV-WAVE Programmer's Guide.
