VECTORDEF
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Syntax
VECTORDEF symbol
@label@ { options } VECTORDEF [*] symbol = expression
Implemented in iMath since version 2.2.0 or earlier.
Explanation
Declares the symbol to be a vector. This is important because vectors are non-commutative when evaluating an expression.
The second form is a shortcut for the combination of VECTORDEF and EQDEF. It defines the symbol and creates an equation defining its value.
Example
VECTORDEF v
@u@ VECTORDEF u = left(STACK{ a # b # c }right)
Declares two vectors u and v and assigns a value to v. In expression evaluation, iMath will treat the vectors as non-commutative, that is, u v ≠ v u.