POSVARDEF: Difference between revisions
Jump to navigation
Jump to search
(Created page with "{{Keyword | <code>POSVARDEF symbol</code> | Defines the symbol to be positive (and real-valued). This allows iMath to evaluate some functions immediately, e.g. absolute va...") |
mNo edit summary |
||
| (4 intermediate revisions by the same user not shown) | |||
| Line 4: | Line 4: | ||
| | | | ||
Defines the symbol to be positive (and real-valued). This allows iMath to evaluate some functions immediately, e.g. absolute value. | Defines the symbol to be positive (and real-valued). This allows iMath to evaluate some functions immediately, e.g. absolute value. | ||
Note that the positive, real-valued symbol is not identical with another symbol that has the same name but a different domain. To avoid confusion, always define your symbols as positive before you use them for the first time. | |||
| | | | ||
3= | 3= | ||
<code>POSVARDEF x</code> tells iMath that <code>x</code> always has a positive real value and therefore <code>abs(x) = x</code>. | <code>POSVARDEF x</code> tells iMath that <code>x</code> always has a positive real value and therefore <code>abs(x) = x</code>. | ||
| | |||
4= | |||
[[REALVARDEF]] | |||
}} | }} | ||
[[Category:Definition]] | [[Category:Declaration]][[Category:Definition]] | ||
Latest revision as of 20:38, 21 February 2025
Syntax
POSVARDEF symbol
Implemented in iMath since version 2.2.0 or earlier.
Explanation
Defines the symbol to be positive (and real-valued). This allows iMath to evaluate some functions immediately, e.g. absolute value.
Note that the positive, real-valued symbol is not identical with another symbol that has the same name but a different domain. To avoid confusion, always define your symbols as positive before you use them for the first time.
Example
POSVARDEF x tells iMath that x always has a positive real value and therefore abs(x) = x.