PureBasic Forums - English

Please feel free to use this math parser in your code. It handles all basic math expressions correctly, including those mentioned above by Stargate.


Thanks John, this could be a big help.
As soon I've more time I will look into it in detail. I am not sure how to continue with the program, maybe it ...

I needed a program to show some math functions, so I wrote a small program doing so.

Grabbed some ... EvalOptimizer= 1

Global EvalExpression.s
Global EvalStep.i
Global EvalToken.s ... X
EvalVarVal(0) = xval

;entry point into parser
EvalStep = 1
EvalError = #EvalNoError ...

... 1.2"}
{RESOURCEFILE "tinyBasic.rsrc"}
{PARSER ON}
{SECUREFILES OFF}

' A temp
' B temp
' C ... K temp
' L number of lines
' N number
' S expression stack index
' T temp
' V variable index

' A ... 27-52] = 26 variables
' [53-82] = 30 items math stack

CONST I$="BYE, CLEAR, CLS, END"
CONST J ...

Lizard
Evaluate and process math expressions
Need a fast infix math evaluator
Search

I think that math rules have been "bowed" by programmers of math parser. :D

Sadly enough, this is very true :x
Only someone who doesn't have sufficient knowledge in this field can write something like ... what the "common" interpretation of this expression is?
Did you perform a survey in a ...

I think that math rules have been "bowed" by programmers of math parser. :D

Sadly enough, this is very true :x
Only someone who doesn't have sufficient knowledge in this field can write something like ... what the "common" interpretation of this expression is?
Did you perform a survey in a ...

... thread are written in a way, so that the scanner (tokenizer) and the parser are independent from each other. So the used scanner can be easily replaced with another one.

For those who like Regular Expressions , here is a scanner that is based on them.
For using it, in the code in the first or ...

... the previous one.
It's purpose is to convert a mathematical expression, so that it's compatible with PB syntax.
There was a discussion that showed need for code like this.

//edit 2015-04-26:
New ... changes.

; -- Special recursive descent parser for mathematical expressions:
; For making ...

Hi,

this is just one more recursive descent parser. :-)
In contrast to the code in the following post, this one evaluates mathematical expressions.
For more details see comments in the code.

//edit 2015-04-23:
Yesterday I had forgotten to translate some error messages into English. Now fixed ...

... team. However, you could look into creating a math parser and evaluator, which would take an entire expression, parse and calculate it, and return the results. The syntax would look something like this: y = math("(0.4^2-(0.6-(x^2+y^2)^0.5)^2)^0.5") ;assuming the variables are globals There are quite a ...

... all IsXxx() and XxxID() functions to the expression parser (for data breakpoints)

8th September 2010 : Version 4.51

- Fixed: Quite some compiler and libraries related bugs
7th June 2010 : Version ... CloseCryptRandom()
- Added: Many math functions: Exp(), ATan2(), Radian(), Degree ...

Hey folks,
Ive seen a simple expression parser before some time and was not able to find it again :(
So if anyone knows a parser for simple math expressions (at least +-*/) with the possibility to add own functions (like mySin() ) on the fly, I would be glad if you could tell me!
I think you mean ...

Hey folks,
Ive seen a simple expression parser before some time and was not able to find it again
So if anyone knows a parser for simple math expressions (at least +-*/) with the possibility to add own functions (like mySin() ) on the fly, I would be glad if you could tell me!

... Like using the execution time of a simple math expression, or getting a directory listing, or something mundane like that.

How complex does an RNG really need to get to be fair, but difficult to ... on to the game to be parsed by a command parser, like a MUD would parse commands from a logged ...

All math books I read in the fractional part of the last hundred years had identical rules: a unary ... 1" independendly what comes behind...

If a parser is not able to decode such things, it won't work either for the "-1" nor the "-2" in the "-1^-2" expression (the program Eigenmath is an example for ...