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Numerics

numerics

Great Reads

by User 6679439

Library extending the .NET numeric support

Amount to Words

by NightWizzard

Convert amounts to their spoken equivalents

Perform a 2D Fourier Transform with the Package mathnet.numerics

by jkluge

How to compute a 2D Fourier Transform using the nuget package "mathnet.numerics"

Using Python to Solve Computational Physics Problems

by Garbel Nervadof

This article demonstrates how to use Python to solve simple Laplace equation with Numpy library and Matplotlib to plot the solution of the equation. We'll also see that we can write less code and do more with Python.

Latest Articles

Perform a 2D Fourier Transform with the Package mathnet.numerics

by jkluge

How to compute a 2D Fourier Transform using the nuget package "mathnet.numerics"

Using Python to Solve Computational Physics Problems

by Garbel Nervadof

This article demonstrates how to use Python to solve simple Laplace equation with Numpy library and Matplotlib to plot the solution of the equation. We'll also see that we can write less code and do more with Python.

by User 6679439

Library extending the .NET numeric support

An Extension to Get All the Digits of a Number

by TheGreatAndPowerfulOz

Gets the digits and the sign of an integer in an array

All Articles

Numerics

2 Dec 2017 by User 6679439

Library extending the .NET numeric support

Amount to Words

18 Dec 2016 by NightWizzard

Convert amounts to their spoken equivalents

Countdown with value from a moltiplication, using timer tick

9 Jan 2022 by OriginalGriff

OK. The first things is that you don't want to store a value in the textbox that you intend to use as a calculation - that's just a bad way to do things. Instead, treat your "multiplication result" separate as hold it as an numeric value i.e. an...

A (probably) quite common problem with numerics

27 May 2012 by Mehdi Gholam

Usually attributes are processed once (type interrogation etc.) so performance is not critical so boxing is a viable option which reduces your code size.I am afraid you can not escape a big switch statement [or a nested IF] (if you can let me know! I have tried :) [DataTypes.cs in RaptorDB...

A (probably) quite common problem with numerics

28 May 2012 by Andreas Gieriet

How about dynamic?If you are willing to pay the run-time cost, and if you are willing to give up on compile-time type check, dynamic could help.C# really lacks generics specialization and (especially if run-time performance matters) compile-time elaboration of generics.In C++ you can...

How to extract numeric value from a given string.

26 May 2015 by Mehdi Gholam

Try :string s = "MR00001012";int val = int.Parse(s.Substring(2)); // first digit starts at position 2

Perform a 2D Fourier Transform with the Package mathnet.numerics

9 Mar 2021 by jkluge

How to compute a 2D Fourier Transform using the nuget package "mathnet.numerics"

A (probably) quite common problem with numerics

28 May 2012 by Sander Rossel

As far as I can see there is no way to have one single constructor. Using a ValueType[^] is an idea, but not very user friendly (since ValueType[^] can be more than just numerics, in which case I would have to throw an Exception[^]). By storing the numerics into a Private field as an...

A (probably) quite common problem with numerics

29 May 2012 by Andreas Gieriet

As a followup to solution #4: if you don't have the dynamic feature at hand (VB.Net, .Net version before 4.0), you may employ casts (see the As(...) method): [AttributeUsage(AttributeTargets.Class)] public class MyAttrAttribute : Attribute { private object _arg; ...

How to validate textbox inside gridview to accept numeric values only

3 Aug 2012 by _Amy

Hi,Try this:HTML:JAVASCRIPT://Restrict the user to key-in chrectors and other special charectorsfunction onlyNumbers(evt) { var e = event || evt; // for trans-browser...

How to validate a numeric string in vc++

3 Mar 2013 by Leo Chapiro

There are built-in functions like atoi, atof, atol and so long. By using this function you don't need to care of restictions: the given string will be converted or you get zero back!Take a look at e.g. atoi:functionatoiint atoi (const char * str);Convert string to...

How to validate a numeric string in vc++

4 Mar 2013 by David Serrano Martínez

These are standard template solutions:#include #include #include // Checks if a std::string can be converted to a type T.template bool Is(const std::string& s){ T value; std::istringstream is(s); is >> value; ...

C# Newton Raphson help

28 Nov 2013 by OriginalGriff

So, use the debugger.Work out manually what the first iteration value should be, and then put a breakpoint on the first instruction inside the loop.Now run the program. When it hits the breakpoint, single step through until you reach the line:a += -dfn;Is the value of "dfn" greater than...

How to Generate an big txt file

20 Nov 2014 by Fredrik Bornander

If you want to use C, something like this might work for you;#include #include #include char* append_char(char* buffer, char character) { *buffer = character; return ++buffer;}char* append_number(char* buffer, int number, char* temp_buffer)...

How to extract numeric value from a given string.

26 May 2015 by _Asif_

Try regular expression with [0-9]+. There are tons of information present, you just need to google!Regards,Asif

How to validate textbox inside gridview to accept numeric values only

3 Aug 2012 by Leo Rajendra Dhakal

How to validate textbox inside gridview item templates to accept numeric values only

How to validate textbox inside gridview to accept numeric values only

3 Aug 2012 by Abhinav S

Have a look at the RequiredFieldValidator[^].This article[^] should also give you some updates.

Gridview with Paging and sorting source code..

11 Feb 2013 by kk2014

Hi,i have a requirement of Gridview with paging and Sorting(on column header click). numeric paging required on both top and bottom side.is there any reference source code or link available? that will helpful to me.thanks

C# Newton Raphson help

28 Nov 2013 by Member 10432522

So this is my codedouble a = 1, Lspan = 30, Lcable = 33, fn, fdn,dfn ; do { fn = ((2 * a) * (Math.Sinh(Lspan / (2 * a)))) - Lcable; fdn = (2 * (Math.Sinh(Lspan / (2 * a))) - (((Lspan / (2 * a)) *...

How to Generate an big txt file

20 Nov 2014 by Richard MacCutchan

Slightly simpler than Fredrik's solution:#define MAXIMUM 10//00000int main{ FILE* fp; int count, number; char szNumber[16]; fp = fopen("testfile.txt", "w"); for (count = 1; count

How to prevent auto rounding in oracle ?

12 Mar 2015 by Member 10500506

Hello Everyone,I need one solution to prevent automatic rounding of number in oracle. Here I am explaining what I want.Please go through this flow.SQL> create table dm_demo(no number(23,9));Table createdSQL> insert into dm_demo values (9999999.999999999);1 row...

How to prevent auto rounding in oracle ?

14 Mar 2015 by Jörgen Andersson

As Tom Kyte says[^]: "SQLPlus has a default number format is uses to display data on the screen "nicely". You need toeithero set the numformat to something you likeo use a TO_CHAR on the number with a format that applies in your case.Info on how to set Numformat here[^].

How to prevent auto rounding in oracle ?

17 Mar 2015 by Smart003

in oracle to display a numbers after the decimal point we use the concept of precision in the number datatype.check about it

How to validate whether MvxString has only numbers

14 Jun 2015 by Member 11765980

How to validate whether MvxString has only numbers

Fastest way to get a fraction length (in digits)?

21 Mar 2016 by Patrice T

Quote:I have 'that' fraction as a C stringJust calc the length of string minus 2 and you are done. There is no solution in constant time.

Countdown with value from a moltiplication, using timer tick

9 Jan 2022 by MXwell8

Hi, I have a question how can I convert the result of a multiplication into hh:mm:ss? This is the code Public Class Form9 Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged Dim nmpts As...

Using Python to Solve Computational Physics Problems

12 Jan 2020 by Garbel Nervadof

This article demonstrates how to use Python to solve simple Laplace equation with Numpy library and Matplotlib to plot the solution of the equation. We'll also see that we can write less code and do more with Python.

Accurate Calculation of Sums of Multiples

2 Mar 2017 by Daniel Pfeffer

A method for "nearly correct" rounding of sums of multiples

Useful Numerical, Bits & Hashing Routines

23 Dec 2015 by Shvetsov Evgeniy

Helper functions to deal with the individual bits & digits, hashing and other

A (probably) quite common problem with numerics

27 May 2012 by Sander Rossel

So I'm having a small problem when working with numerics. I can't really imagine that I am the only one with this problem, yet I can't find any solutions. So here it goes.I am making an Attribute[^] which takes a numeric in its constructor (ANY numeric). Now here is the problem, there are...

A (probably) quite common problem with numerics

27 May 2012 by Zoltán Zörgő

Have you considered using ValueType[^] as argument type of your constructor? As it is a larger subset than numerics, the utility in the above msdn article could be also of use.

How to validate textbox inside gridview to accept numeric values only

3 Aug 2012 by Christian Graus

Assuming this is not a web app, because if it was, you'd have said so, handle the keypress or keydown event for your textbox, and call a method that checks Char.IsDigit and Char.IsControl and set Handled = true so that the keypress is rejected. If this is a web app question, tag your questions...

An Extension to Get All the Digits of a Number

10 Mar 2017 by TheGreatAndPowerfulOz

Gets the digits and the sign of an integer in an array

How to Generate an big txt file

20 Nov 2014 by GeorgeGkas

Hello guys. I want to ask if there is a way to generate a txt file that contains 1.000.000 different numbers all in one line.Is there a way to do it? I use both linux and windows machines but I prefer to use a C program code.

Extended Number to Numeral (Number Spelling) Converter

25 May 2016 by Shvetsov Evgeniy

Numbers (positive AND negative integral/fractional) to english/russian words

How to validate a numeric string in vc++

3 Mar 2013 by Vaibhav_J_Jaiswal

Hi everybody, I am new in vc environment. Is some one suggest me how I validate the numeric string? My requirements are as follows:a)numeric string have negative numbers.b)range is from -1000 to 1000.Currently I do the following things:a)remove leading zeros.b)remove special...

How to extract numeric value from a given string.

26 May 2015 by arunsiddhu1992

I have a string as 'MR000000001'. Also the string value can vary from 'MR000000001' to 'MR999999999'.I want to extract the numeric value form that string.I tried TryParse method but it does not work.Please help me out.Thanks in advance.

Fastest way to get a fraction length (in digits)?

21 Mar 2016 by Shvetsov Evgeniy

Assuming i have some decimal fraction of unknown length AND without the integral part:0.123 [3]OR0.0200405 [7]OR0.0000000987 [10]etcI have 'that' fraction as a C string (after convertion with the sprintf) AND as a long double (after using modfl). I take word that in a columns...