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It is recommended to always use the iMath menus to create or modify iFormulas. Nevertheless, sometimes it will be necessary to fine-tune equations by editing them directly.


All iMath commands start with the string <code>%%ii</code> at the beginning of a line, which will be interpreted as a comment by Openoffice. When the document is recalculated, iMath parses the string and generates the formula that is displayed. The generated lines are marked by <code>%%gg</code> at the end of the line. Editing such a line makes no sense because it will be deleted at the next recalculation! Always modify the <code>%%ii</code> lines if you want to tweak an iFormula. Formulas may also have lines without either <code>%%ii</code> or <code>%%gg</code>, these will not be touched by iMath.
== Elements ==
The following elements can be part of an iFormula definition string
* <code>symbol</code>
The name of a mathematical symbol or function, e.g. <code>x</code> or <code>a_n</code>
* <code>expression</code>
A mathematical expression in Openoffice math format
* <code>list = { element; element; ... }</code>
A list of other elements, enclosed in parentheses and separated by semicolons
== Commands ==
After the initial <code>%%ii</code>, the following commands are possible:
* <code>READFILE { "path/to/file" }</code>
Open the given file and parse the iMath commands in this file. This command can be used to put common formulas in a file to re-use them. At the moment, the path is operation-system dependent, not a Openoffice URL!
* <code>CLEAREQUATIONS</code>
iMath stores all equations and functions that it encounters. If you want to make a fresh start in your document, use this command
* <code>FUNCTION { hints, symbol, expression }</code>
Declare a user-defined function. <code>symbol</code> is the name of the function. The expression declares the arguments of the function and can be either a single symbol or a list of symbols. The way that iMath treats this function can be influenced by function hints:
** none: No function hints (must be used because iMath requires three arguments to the <code>FUNCTION</code> declaration
** lib: A library function: It will not be affected by <code>CLEAREQUATIONS</code>
** trig: For trigonometric functions. Tells iMath that this function will get special treatment when printing (e.g. <math>sin^2 x</math> instead of <math>(sin x)^2</math>)
** expand: The function is to be expanded immediately. Useful for functions that are really abbreviations, e.g. <code>square(x)</code> will be expanded to <math>x^2</math>
** nobracket: The function does not require brackets around the argument (e.g. <code>sqrt(x)</code> is printed as <math>root x</math>)
** defdiff: Differentiate the definition of the function, not the function itself

Latest revision as of 18:01, 9 July 2017

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