how to add another function ?

[mutelove]

how to add another function ?

[harperjiang]

Hello,

All the functions are defined in class "FuncExpression".

To create a new function, first you need to extend "FuncCallback" to declare the parameters type and how you calculate the return value. Line 46-64 of FuncExpression.m is an example.

Then you need to register your function with a name you want to use. Check line 152-161, where I have registered 3 functions.

After these steps you can try to invoke your new function from the command line.

I am glad you are interested in this small tool. Feel free to write me email if you have further questions.

Regards,
Harper

[mutelove]

Thank you for you response,
I mean add function in calculator for calculate derivation, for example d(tan(x))/dx

[harperjiang]

I see.

These pre-defined functions are what I called "Basic Functions", and they are managed in class "BasicFuncExpression".

In this file I have currently defined three basic function SIN/COS/LN, and you can add more functions as you like with the following steps:

1. Add a new type to the enum BasicFuncType
2. Modify BasicFuncExpression.m to give the result of differentiation/integration for this new function
3. Modify the "calculus.lpp" and "calculus.ypp" to add new function name to the parser so that the new function can be recognized.

Hope this helps.

Regards,
Harper

[mutelove]

I did it, but new function do not work

[mutelove]

I think there is need some changes in "CalculusLexer.cpp" and "CalculusParser.cpp" and "CalculusParser.h" I tried to do, but I had no results.

[harperjiang]

These files should be generated by flex/bison automatically. I never manually modify them.

There may be some problem with the configuration of XCODE that prevent it from recompile the lpp file. You can manually invoke flex and bison from the command line to regenerate the files, then refresh the workspace. I will check whether I can find the command I use before and send it to you.

[mutelove]

thank you , my email is : rashvand at hotmail.com