Reference Guide
Full Command and Function Reference 3-277
After receiving an XOFF command (with transmit pacing in the reserved variable IOPAR set),
XMIT stops transmitting and waits for an XON command. XMIT resumes transmitting if an
XON is received before the time-out set by STIME elapses; otherwise, XMIT terminates, returns
a 0, and stores "Timeout" in ERRM.
Access: …µ
XMIT
Flags: I/O Device (–33), I/O Device for Wire (–78)
Input/Output:
Level 1/Argument 1 Level 2/Item 1 Level 1/Item 2
“string”
→
1
“string”
→
“substring
unsent
”
0
See also: BUFLEN, SBRK, SRECV, STIME
XNUM
Type: Command
Description: Converts an object or a list of objects to 12-digit decimal numeric format. Similar to →NUM
except that →NUM does not work with lists, nor in programs in algebraic mode.
Access: Catalog, …µ
Input: An object or list of objects.
Output: The objects in numeric format.
Example: Find the 12-digit numeric values of π/2, 3e, and 4cos(2).
Command:
XNUM({
π
/2,3*e,4*COS(2})
Results:
{1.5707963268 8.15484548538 -1.66458734619}
See also: I→R, →NUM
XOR
Type: Function
Description: Exclusive OR Function: Returns the logical exclusive OR of two arguments.
When the arguments are binary integers or strings, XOR does a bit-by-bit (base 2) logical
comparison:
•
Binary integer arguments are treated as sequences of bits with length equal to the current
wordsize. Each bit in the result is determined by comparing the corresponding bits (bit
1
and bit
2
)
in the two arguments, as shown in the following table:
bit
1
bit
2
bit
1
XOR bit
2
0 0 0
0 1 1
1 0 1
1 1 0
•
String arguments are treated as sequences of bits, using 8 bits per character (that is, using the
binary version of the character code). The two string arguments must be the same length.
When the arguments are real numbers or symbolics, XOR simply does a true/false test. The result
is 1 (true) if either, but not both, arguments are nonzero; it is 0 (false) if both arguments are
nonzero or zero. This test is usually done to compare two test results.
If either or both of the arguments are algebraic objects, then the result is an algebraic of the form
symb
1
XOR symb
2
. Execute →NUM (or set flag –3 before executing XOR) to produce a numeric
result from the algebraic result.
Access: …ã
L
LOGIC XOR
(ã is the right-shift of the 3key).