This menu entry or tool button opens the Functions Editor. Here you can enter the functions' equations of up to 10 functions or function groups. The parser knows explicit and parametric form. With specific extensions it is possible to add first and second derivation and to choose values for the function group parameter.
Some syntax rules must be complied with:
name(var1[, var2])=term [;extensions]
The functions name. If the first character is “r” the parser assumes that you use polar coordinates. If the first character is “x” (for instance “xfunc”) the parser expects a second function with a leading “y” (here “yfunc”) to define the function in parametric form.
The functions variable
The function group parameter. It must be seperated by a comma.
The function's term
These functions and constants and even all user defined functions can be used to determine the axes settings as well.
The function will be stored but not be drawn. So it can be used like any other user defined or predefined function.
The graph of the derivative of the function will be drawn additionally with the same color but less line width. This extension has no effect on functions defined in parametric form.
The graph of the second derivative of the function will be drawn additionally with the same color but less line width. This extension has no effect on functions defined in parametric form.
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With this extension you can give a list of values for the parameter of a function group of which the graph should be drawn. Also terms are allowed. The use of this extension presumes that the parameter is given as a second function variable.