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updated: help

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git-svn-id: svn://ttmath.org/publicrep/ttcalc/trunk@118 e52654a7-88a9-db11-a3e9-0013d4bc506e
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Tomasz Sowa
2009-04-02 10:26:55 +00:00
parent 6555140b9a
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help/userfunctions.html
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@@ -16,19 +16,24 @@
<h1>User defined variables and functions</h1>
<p>
You are allowed to define your own variables and functions. As a name of a variable or a function
can be a name consists of letters, digits or an underline character but the first character must be a letter.
You are allowed to define your own variables and functions. As a name of a variable or function
can be a name consists of letters, digits or an underline character (only the first character must be a letter).
From version 0.8.3 names are case-sensitive that means 'name' is not the same as 'NaMe'. For example these
are correct names: a, b, c3, MyName, etc. During defining variables and functions you can call another
variables and functions but you cannot call a variable or a function twice. Recurrence calling are not allowed.
are correct names: a, b, c3, MyName. During defining variables and functions you can call another
variables and functions.
</p>
<p>
Functions can get maximum 9 parameters. You have to specify how many parameters your function takes and
you can refer to them by using the variable 'x' with a number from 1 to 9 ('x' without a number means 'x1').
For example you can define a function 'xy' as 'x1*x2' (of course without apostrophes), set the 'parameters' on 2
and then put into the edit box an expression 'xy(10;20)', the result will be 200. Note that we use a semicolon
to separate arguments in a function.
For example you can define a function 'xy' as 'x1*x2' (of course without apostrophes), set the 'parameters' to '2'
and then put into the edit box expression 'xy(10;20)', the result will be '200'. Note that we use a semicolon
to separate arguments in the function.
</p>
<p>
More complex example: myfunction(x) which returns sin(x) when the x is negative, 0 when the x is 0, and cos(x) when the x is greater than 0: <br>
myfunction(x)='if(x==0; 0; if(x<0; sin(x); cos(x)))'
</p>
</body>