Reference Guide

Full Command and Function Reference 3-103
Access: !°LL RUN & DEBUG HALT ( °is the left-shift of the Nkey).
Input/Output: None
See also: CONT, KILL
HEAD
Type: Command
Description: First Listed Element Command: Returns the first element of a list or string.
Access: !°L CHARS L HEAD ( °is the left-shift of the Nkey).
!° LIST ELEMEN L HEAD ( °is the left-shift of the Nkey).
…± L HEAD (± is the right-shift of the Nkey).
Input/Output:
Level 1/Argument 1 Level 1/Item 1
{ obj
1
, ... ,obj
n
}
→
obj
1
“string”
→
“element
1
”
Example 1: "Dead" HEAD returns "D" .
Example 2: The following program takes a list of coordinates { A B C } that define a right triangle, and finds
the length of the hypotenuse AC:
« DUP HEAD SWAP REVLIST HEAD - ABS »
For example, entering { (0,0) (0,3) (3,4) } returns 5 .
See also: TAIL
HEADER→
Type: Command
Description: Header size: Returns the current size of the header in lines.
Access: …µ HEADER →
Input/Output:
Level 1/Argument 1 Level 1/Item 1
→
Header size
See also: →HEADER
→HEADER
Type: Command
Description: Header size: Sets the current size of the header in lines: to 0, 1, or 2 lines.
Access: …µ→HEADER
Input/Output:
Level 1/Argument 1 Level 1/Item 1
Header size
→
See also: HEADER→
HELP
Type: Command
Description: Similar to CASCMD, displays a list of CAS operations. Selecting one with OK displays help for it,
an example of the operation, and the option to copy the example to the command line. More
details are given in Appendix C and Appendix H of the User’s Guide.
Access: Catalog, …µ , or tools IL
See also: CASCMD