VECTORDEF: Difference between revisions

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<code>VECTORDEF v</code>
<code>VECTORDEF v</code>


<code>VECTORDEF u = STACK{ a # b # c }</code>
<code>@u@ VECTORDEF u = left(STACK{ a # b # c }right)</code>


Declares two vectors <code>u</code> and <code>v</code> and assigns a value to <code>v</code>. In expression evaluation, iMath will treat the vectors as non-commutative, that is, <code>u v &ne; v u</code>.
Declares two vectors <code>u</code> and <code>v</code> and assigns a value to <code>v</code>. In expression evaluation, iMath will treat the vectors as non-commutative, that is, <code>u v &ne; v u</code>.

Latest revision as of 16:35, 4 January 2023

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.

See also

MATRIXDEF