Hi,
A few months ago, I saw an equation parser, written in c#, and using
regular expressions (I think!), but now I cannot recall where I saw
it- if anyone saw anything like this, could they please post the url?
>From memory,
the parser not only dealt with operator precedence, but also the use
of brackets, so that any complicated expession could be re-written as
an equation that could be read from left-to-right, as a simple
sequence of sub-equations using basic operators, +,-,/,*
The reason why I ask is that I am anticipating user input into a form
as a string, and I need to convert it into
an equation. The user inputted expression could be something like (a+
(b-d)*(e-c))/f so I need to find a way to parse it.
TIA
Paul 6  7986 
I doubt if this is what you saw earlier, but here is a link to a
TRINUG usergroup meeting presentation that describes making a
WindowsForm DataGridView into Excel. It has a very simple/minimal C#
calculation engine defined that handles precedence and parentheses.
Maybe it will be of help in your task.
http://www.trinug.org/Portals/0/DataGridViewCus tomization%20-%20Oct%20'06.zi p
=============== ========
Clay Burch
Syncfusion, Inc.
Maybe this: http://www.osix.net/modules/article/?id=761
Or this: http://www.osix.net/modules/article/?id=776
HTH
Fabrizio
<tr************ ***@btinternet. comwrote in message
news:11******** **************@ k78g2000cwa.goo glegroups.com.. .
Hi,
A few months ago, I saw an equation parser, written in c#, and using
regular expressions (I think!), but now I cannot recall where I saw
it- if anyone saw anything like this, could they please post the url?
>>From memory,
the parser not only dealt with operator precedence, but also the use
of brackets, so that any complicated expession could be re-written as
an equation that could be read from left-to-right, as a simple
sequence of sub-equations using basic operators, +,-,/,*
The reason why I ask is that I am anticipating user input into a form
as a string, and I need to convert it into
an equation. The user inputted expression could be something like (a+
(b-d)*(e-c))/f so I need to find a way to parse it.
TIA
Paul
One other comment is that there are commercial products that would
allow you to write code that would input a string like (a+(b-c)*(e-c)/
f, identify the unknowns a,b,c,d,e,f, and then allow your user to
input the values for these unknowns and finally compute the entered
expression.
=============== =============== =
Clay Burch
Syncfusion, Inc.
Taking a dependancy on powershell may not work for you, but would allow you
to invoke any expression you can do on the command line and also can use any
..net lib (i.e. system.math) or external lib. And you can script your host
with it too if needed.
--
William Stacey [C# MVP]
PCR concurrency library: www.codeplex.com/pcr
PSH Scripts Project www.codeplex.com/psobject
<tr************ ***@btinternet. comwrote in message
news:11******** **************@ k78g2000cwa.goo glegroups.com.. .
| Hi,
| A few months ago, I saw an equation parser, written in c#, and using
| regular expressions (I think!), but now I cannot recall where I saw
| it- if anyone saw anything like this, could they please post the url?
| >From memory,
| the parser not only dealt with operator precedence, but also the use
| of brackets, so that any complicated expession could be re-written as
| an equation that could be read from left-to-right, as a simple
| sequence of sub-equations using basic operators, +,-,/,*
|
| The reason why I ask is that I am anticipating user input into a form
| as a string, and I need to convert it into
| an equation. The user inputted expression could be something like (a+
| (b-d)*(e-c))/f so I need to find a way to parse it.
|
| TIA
|
| Paul
| This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
by: Sven Dzepina |
last post by:
Hello people =)
Has somebody a nice script, which can solve equations ?
It would be super, if someone has an idea where I can get such a script /
code in php.
Thanks.
Gretting!
|
by: Russell Blau |
last post by:
This is not really a Python question, but it does relate to a Python program
I'm working on, so this seems like as good a place as any to ask for
suggestions ...
I'm working on a GUI application that lets the user enter an alegbraic
equation and displays a nicely-formatted representation of the same equation
(and then maybe does other stuff with it). The question is: if you have an
equation containing terms such as x * y / z, which way...
|
by: Brian Kazian |
last post by:
Here's my problem, and hopefully someone can help me figure out if there is
a good way to do this.
I am writing a program that allows the user to enter an equation in a text
field using pre-existing variables. They then enter numerical values for
these variables, or can tell the program to randomize the values used within
a certain bounds. My problem is taking in this equation they have written
in the text field and converting it into...
|
by: Stud Muffin |
last post by:
Hey
Basically, I'm trying to take objects created in microsoft word using
equation editor (for creating clean looking math/physics equations)
and putting them into some sort of webpage format. But they come out
grossly unalligned and ugly when I try to directly copy and paste into
microsoft frontpage 2000. Few things I could do is place them directly
using x/y coord (which i don't know how to do), or just taking
screenshots and use...
|
by: gamehack |
last post by:
Hi all,
I was thinking about parsing equations but I can't think of any generic
approach. Basically I have a struct called math_term which is something
like:
struct math_term {
char sign;
int constant;
int x;
int y;
| | |
by: w33nie |
last post by:
My table is pretty well complete, but I would prefer it if the value for Points could be turned into a mathematical equation,
and this equation would use the data from the other fields in the table to achieve a value.
I want this done in phpMyAdmin 2.7, if possible, so that when I change the values in other fields, the Points variable changes, due to its equation.
The equation I would want would be something like:
"won * 3 + drawn * 1"...
|
by: Trev17 |
last post by:
Hello, I am new to C++ and i have tried for several hours to make a program my teacher has given me as a lab. Here is the Lab question:
the roots of the quadratic equation ax^2 + bx + c = 0, a cannot equal 0 are given by the following formula -b + or - square root of (b^2 - 4ac) / 2a.
If b^2 - 4ac = 0 then equation has a single root. if b^2 - 4ac > 0 then equation has two real roots. if b^2 - 4ac < 0 then equation has two complex...
|
by: Constantine AI |
last post by:
Hi i am having a little problem with an equation function that was created from all your help previously. The function works fine itself but with a small glitch within it.
Here is the function code.
Public Function fCalcEquation(strEquation As String) As Long
Dim MyDB As DAO.Database
Dim rstParameters As DAO.Recordset
Dim intParamPosition As Integer
Dim strParameter As String
Dim strValue As String
|
by: phoenix1990 |
last post by:
so i have an entry frame where i want to input an equation, and i need to turn the string into an actual equation in terms of x. so that i can plot it on a canvas.
i already know how to make the entry frame, and how to extract the string equation that was inputed.
the only problem i'm having is converting it into an actual equation.
e.g.
the string input is 'sin(x)'
and i want to turn it into sin(x)
x is defined by another entry frame...
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
| | |
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
|
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
|
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
| | |
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
| |
