Scientific Math Text Input Evaluator

[Rioven]

Hi

Attached is code to evaluate math same as Basic4ppc code operations.

This supports ^, MOD, /,*,-,+, INT,ABS,SIN,COS,TAN,ASIN,ACOS, ATAN,LN,EX(for e),E[E+,E-](for eng'g),PI.

calculations in radians.

I've tried to compare results to Basic4PPC operations and it's ok, but still need to test for other bugs.(sometimes I got last (13th)decimal place descripancy in comparison).

I'll add factorial (!) on next update.


Regards,

[Rioven]

Now also supports factorial 170! maximum. (integer number only)

Fixed, Entering constant(PI or EX) alone now returns value.

TIP: New Variables/constants can be added at line 380.

[HarleyM]

Nice work !!! I have a partially written project to graph a range of numbers based on a formula in a text box. Bingo !! you have the missing link I was looking for.

[Rioven]

Hi HarleyM,

This from my old code just converted to Basic4ppc, It can be optimized further. I created this function for my project that user can alter the default calculation formula or input their own formula.

Hope it works well for you.
Please test it more and let me know if there are still problems.

Regards,
Rioven

[HarleyM]

I connected your code into a program that I'd written around Erel's Eval routine. Your code breathes new life into it. Allowing the user to select a range of x values & uses your routines to populate a table based on the formula entered into a text box. The user can then display the table in one of 3 graph formats. Thanks again for the work you did in creating the expression calculator. I only needed to change one thing & that was to reset the 'C' variable after a calculation so that it would accept modified variables thereafter.

Cheers!!

[Rioven]

Originally Posted by HarleyM

I connected your code into a program that I'd written around Erel's Eval routine. Your code breathes new life into it. Allowing the user to select a range of x values & uses your routines to populate a table based on the formula entered into a text box. The user can then display the table in one of 3 graph formats. Thanks again for the work you did in creating the expression calculator. I only needed to change one thing & that was to reset the 'C' variable after a calculation so that it would accept modified variables thereafter.

Cheers!!

Hi HarleyM,
Thanks for pointing out the C variable to reset.
I attached the revised code and this is still
I've fixed some input variable/constant filters and bug on dividing negative value.
The code requires more input filters or errorhandling and tests.

Regards,