41 lines
1.6 KiB
HTML
41 lines
1.6 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
|
|
|
|
<html lang="en">
|
|
|
|
<head>
|
|
<title>TTCalc - user defined variables and functions</title>
|
|
<link rel="stylesheet" href="styles.css" type="text/css">
|
|
<object type="application/x-oleobject" classid="clsid:1e2a7bd0-dab9-11d0-b93a-00c04fc99f9e">
|
|
<param name="Keyword" value="user defined variables">
|
|
<param name="Keyword" value="user defined functions">
|
|
</object>
|
|
</head>
|
|
|
|
<body>
|
|
|
|
<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 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. 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' 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>
|
|
</html>
|
|
|