VAL: Difference between revisions
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<code>VAL ( [[expression]] )</code> | <code>VAL ( [[expression]] )</code> | ||
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Try to find a value for the expression from any equations defined previously in the document. A value is | Try to find a value for the expression from any equations defined previously in the document. A value is expected to be a quantity, that is a number with optional units. If the expression cannot be reduced to a quantity, it will be reduced to numerical values as for as possible. | ||
The expression will contain rational numbers, not floats, unless a conversion to a floating point number is | The expression will contain rational numbers, not floats, unless a conversion to a floating point number is required to obtain a quantity. This might be the case e.g. if the expression contains square roots of rational numbers. If you want to force a conversion to floats, use <code>[[QUANTITY]]</code> instead. | ||
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3= | 3= | ||
Revision as of 15:45, 1 July 2017
Syntax
VAL ( expression )
Implemented in iMath since version 2.2.0 or earlier.
Explanation
Try to find a value for the expression from any equations defined previously in the document. A value is expected to be a quantity, that is a number with optional units. If the expression cannot be reduced to a quantity, it will be reduced to numerical values as for as possible.
The expression will contain rational numbers, not floats, unless a conversion to a floating point number is required to obtain a quantity. This might be the case e.g. if the expression contains square roots of rational numbers. If you want to force a conversion to floats, use QUANTITY instead.
Example
EQDEF a = 3 x
EQDEF b = 2 x
EQDEF x = 7 %metre
EXDEF VAL(a + b)
This will output 35 "m".
See also
QUANTITY QUANTITYWITH NUMVAL NUMVALWITH VALWITH UNIT UNITWITH