4-78 Computer Algebra Commands
Command: UNASSIGN({U, V})
Result: {17.5, V}
See also: ADDTOREAL, ASSUME, DEF, LOCAL, PURGE, STO, STORE, UNASSUME,
UNBIND
UNASSUME
Type: Command
Description: Removes all assumptions on specified global variables, whether created by default, by
ADDTOREAL or by ASSUME. Does this by removing the variable names from the list
REALASSUME. Returns the variable names. To remove assumptions on a variable but leave
it in REALASSUME, use ADDTOREAL instead of UNASSUME.
Access: Catalog, …µ
Input: Level 1/Item 1: The name of a global variable, or a list of global names, to be removed from
the REALASSUME list.
Output: Level 1/Item 1: The same name or list of names as was input, even if any of the named
variables were not in REALASSUME.
Example: Remove the variables S1 and S2 which are include in the REALASSUME list by default.
Command:
UNASSUME({S1, S2})
Result: {S1, S2}
See also: ADDTOREAL, ASSUME, DEF, LOCAL, UNASSIGN, UNBIND
UNBIND
Type: Command
Description: Removes all local variables created by the LOCAL command, and returns their values. This is
useful only if a program needs to remove local variables created earlier in the same program.
Access: Catalog, …µ
Input: None
Output: Level 1/Item 1: A list of the local variables that have been removed, with their values.
Example: Remove the local variables ←A and ←B created by the example for LOCAL.
Command:
UNBIND
Result: {←B=2, ←A=0}
See also: DEF, LOCAL, STORE, UNASSIGN, UNASSUME
VANDERMONDE
Type: Command
Description: Builds the Vandermonde matrix (also called the alternant matrix) from a list of objects. That
is, for a list of n objects, the command creates an n × n matrix. The i
th
column in the matrix
consists of the list items raised to the power of (i–1). Sometimes the Vandermonde matrix is
defined with the i
th
row containing the items raised to the power of (i–1); to obtain this,
transpose the result with the command TRAN.
Access: Matrices, !Ø
CREATELL, !´ MATRX MAKE LL
Input: A list of objects. A vector is allowed too.
Output: The corresponding Vandermonde matrix.
Flags: Exact mode must be set (flag –105 clear).
Numeric mode must not be set (flag -3 clear).
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