EQDEF: Difference between revisions
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<code>@lib:pythagoras@ EQDEF c^2 = a^2 + b^2</code> creates the equation and stores it permanently. It can then be used by substituting values for <code>a</code> and <code>b</code> into it and solving for <code>c</code>. | <code>@lib:pythagoras@ EQDEF c^2 = a^2 + b^2</code> creates the equation and stores it permanently. It can then be used by substituting values for <code>a</code> and <code>b</code> into it and solving for <code>c</code>. | ||
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[[Category:Definition]] | [[Category:Definition]] | ||
Latest revision as of 19:04, 27 June 2017
Syntax
@label@ { options } EQDEF [*] expression
Implemented in iMath since version 2.2.0 or earlier.
Explanation
Define an equation. The expression must be of the form expression1 = expression2.
The starred form will suppress printing of the result.
For the special case of the equation label starting with lib:, the equation will not be erased by CLEAREQUATIONS. This is useful for building a library of generic equations.
Example
@y@ EQDEF y = 3 x + 4 creates the equation and stores it for later usage under the label @y@. iMath also remembers that the numeric value of y can be found from this equation provided that x is given a numeric value in some other equation.
@lib:pythagoras@ EQDEF c^2 = a^2 + b^2 creates the equation and stores it permanently. It can then be used by substituting values for a and b into it and solving for c.