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Questions tagged [floating-point]

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For questions with concerns specifically related to the usage of floating point, such as accuracy and precision of calculations, handling of 0, infinity, and over/underflow, input/output, and binary representation. Not for code that casually happens to use floating point.

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This is a library I've been writing, for now named ALFPN, for converting between native floats and layouts that are not native - half, various 8-bit formats etc. ...
herhor67's user avatar
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8 votes
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I have written a C program to compute values of the Hardy Z function, \$Z(t)\$. The Hardy Z function is a continuous, real-valued function that takes a positive real number \$t\$ as its input and ...
TMurphy's user avatar
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This is a simple function that accepts a null-terminated string that represents a non-negative number of seconds. It can optionally end in the suffix "s" (seconds, default), "m" (...
xiazhu's user avatar
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6 votes
2 answers
125 views

I originally premiered this code to the internet in this StackOverflow post, and per a recommendation through one of the comments, I am reposting it here. I am making a floating-point number set ...
Xavier Pedraza's user avatar
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6 votes
2 answers
479 views

When we add lots of floating-point values, we can lose precision if we blindly use std::accumulate() or similar, when the running total becomes much larger than the ...
Toby Speight's user avatar
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I'm looking for a function in C++ that can determine, how accurate all floating point numbers in a given range can be represented as strings, without the use of e.g. boost library, etc. Please take a ...
Tobias Grothe's user avatar
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I am trying to make an is_integer template function to determine a number is an integer or not. The experimental implementation ...
JimmyHu's user avatar
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3 answers
3k views

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my_stack_exchange_account's user avatar
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2 answers
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Whatever language you choose, you may encounter a rounding problem. In fact, this is due to the limit of the required number of bits needed to get the right number after a calculation. Simple example: ...
Sébastien Josserand's user avatar
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I have a sample svg file from the graphics program Inkscape. My objective is to collect every third pair from a very long line of floating point numbers. That seems simple enough. The larger objective ...
Bryan-StackExchange's user avatar
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3 answers
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I implemented the following code for determining if two floating point numbers are equal is_float_equal(...). It handles the tests for my use cases well, but I was ...
dvnlo's user avatar
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4 votes
3 answers
559 views

I am a beginner, who is just learning the language (C++) from C++ Primer. I have been trying to build a side pico-project by writing functions for validation of user input for an signed double. The ...
SogaBan's user avatar
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1 answer
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I have designed a class to perform float compare. I used Knuth's strong compare to do it. Float compare is really really tricky, I'm sure there's something wrong :) Any comments? ...
greywolf82's user avatar
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I wrote a function that receives a number as an argument and returns a number (technically, a string) with a maximum of 3 numerals, no matter if there's a decimal separator or not, plus the adequate ...
Megaptera novaeangliae's user avatar
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This is a follow up to https://codereview.stackexchange.com/questions/272333/conversion-from-long-double-to-string where I do the reverse conversion. This time around it is string to long double. It ...
user253344's user avatar
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I live in hostile environments (GCC and Clang) which remove calls to isnan which prevents me to perform validation of my input before running computations. Here is ...
Jean-Michaël Celerier's user avatar
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1 answer
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I wanted to make an algorithm that is a counter-example of Cantor's diagonalization argument. Given an integer, this Python code will produce a unique rational number. Fed the sequence of positive and ...
Brent's user avatar
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1 answer
195 views

I made a function in Rust to add two floating point numbers (f32s) together using only their bit representation and integer operations. I have tested it for a quite ...
isaacholt100's user avatar
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3 answers
147 views

I have a function which takes one argument, a fraction, and returns two numbers - an integer and a power of two. So, when you divide the the integer by 2 raised to power power of two, you get the ...
Krokodil's user avatar
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2 votes
3 answers
363 views

I'm trying to write a function to replace the standard std::stod(...). I want to parse the following valid inputs: ...
Cristian's user avatar
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1 answer
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latest updated version in cross-post from SO I'm testing performance regression of some code I wrote (this is not that code) by timing its execution in Unit tests. I would like to see if execution ...
Greedo's user avatar
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I've written this class to wrap a collection of bytes and interpret them as 16-bit floats. It's supposed to work like memoryview(buf).cast('f') or ...
Sekenre's user avatar
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2 votes
1 answer
592 views

The rationale behind this code is to implement a runtime-safe number conversions in situations when precision loss is possible, but is not expected. Example: passing a ...
Dmitry's user avatar
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1 answer
3k views

I wrote a program to convert float to it's binary IEEE754 representation in C. Any improvements to this is appreciated ...
C--'s user avatar
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4 votes
1 answer
290 views

The objective was to write a locale-independent function that prints floating-point numbers (i.e. one that always uses . as a decimal point regardless of the locale)...
Kirby Kevinson's user avatar
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1 vote
1 answer
625 views

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Krupip's user avatar
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Faced with converting floating-point values from a sensor obtained to string on an embedded system to transmit over UART, I came up with the following dbl2str() to ...
David C. Rankin's user avatar
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7 votes
2 answers
375 views

I have to implement some business logic that will round a number (typically a double) upwards. Given that this number comes from a third-party and I don't know how they come to calculate it I'm ...
HexedAgain's user avatar
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8 votes
2 answers
505 views

Given a floating-point number, which is representing a dollar value, I'm aiming to return a rounded, human-readable string. Here are the rules for numbers equal to or greater than 1 million, equal to ...
Martin Burch's user avatar
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2 votes
1 answer
1k views

So there is an existing codebase which calculates the total time worked per month. What the code is doing: iterates through all the working days entries retreives the value of net work time which is ...
tinamou's user avatar
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3 votes
1 answer
1k views

I have done a clustering algorithm and represented the results in a pie chart as shown below. ...
P H's user avatar
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0 answers
88 views

After discovering Float Toy, my goal was to create my own version using Python and Tkinter. The results of the endeavor is shown below. Most of the functionality is complete, but the ...
Noctis Skytower's user avatar
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2 votes
1 answer
119 views

Relatively new to Python. Have some experience in C++. I have written a small program that reads a CSV file (SAMPLE) and initialises two arrays and few values. ...
Aditya Soni's user avatar
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1 vote
1 answer
218 views

I am trying to make a function for floating point numbers comparison. The goal is to "evaluate" all operators in single function: >, >=, =, <=, <. If X>Y, then F>0. If X==Y, F==0. If X<=Y, F&...
herhor67's user avatar
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25 votes
4 answers
4k views

I have an implementation of the sqrt function that uses a combination of IEEE 754, packed bitfields, and the Newton-Raphson algorithm: ...
S.S. Anne's user avatar
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7 votes
2 answers
408 views

I wrote a floating-point multiplication function as an excercise. The program compares its result to the usual hardware multiplication result and for this purpose I use unspecified behavior, but the ...
Nikita's user avatar
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0 votes
2 answers
231 views

I would like to merge two double arrays and remove from the result array approximately equal items. My two input arrays have ...
Wollmich's user avatar
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4 votes
1 answer
4k views

I have created my own personal data structure libraries for C and I've re-engineered it about two times now and I've added alot of preprocessor checks and defines concerning OS type and compiler type. ...
Nergal's user avatar
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1 answer
813 views

Working with currencies I am aware it is not good to work with floating point values due to rounding and maintaining precision. Better is to work with integers. Would the following Currency class make ...
Bruno Vermeulen's user avatar
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4 votes
1 answer
526 views

I'm writing my own version of a Mandelbrot set generator, with pan and zoom functionality. (There's not yet a color overlay of sets generated with various beta values; the beta value is changed ...
Pull Nointer's user avatar
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6 votes
3 answers
2k views

I've got a project where I get product data and need to get the prices which come in, in different formats. Some examples would be: US$17, USD17.00, 17,00€, 17€, GBP17, Only 17,-€, 17.000,00€, 17,000....
Chris's user avatar
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4 votes
1 answer
213 views

This is extension of the rep-string task from Rosette code. I do not only want to check if the input string is the shortest periodic string (rep-string) or not, but also check if it is preperiodic. ...
Adam's user avatar
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-1 votes
1 answer
1k views

Given input array of UINT8 (unsigned char) with numElements how could one efficiently ...
Royi's user avatar
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5 votes
2 answers
577 views

I wrote a program that calculates the minimum number of coins required to give a user change. One concern I have is: When do we initialize the value of a float to be negative or positive? I recently ...
asimichroma's user avatar
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3 votes
2 answers
1k views

Am making a pure .net library with helper functions (GitHub). However I wanted to have a thousand separator for all number types and here is what I am currently doing ...
Billy Watsy's user avatar
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12 votes
1 answer
1k views

Rarely is the exact decimal value of a double needed to be printed and only its leading significant digits, after rounding, are needed. It is a curiosity to see the ...
chux's user avatar
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2 votes
2 answers
551 views

How could I make this code more effective? ...
ken's user avatar
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1 vote
2 answers
59 views

I have a script that changes the display brightness using xrandr. It is my first bash script. I mainly had a lot of trouble with dealing with the floating point ...
Tristan's user avatar
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3 votes
0 answers
118 views

I am implementing a new compression algorithm for the weights of a neural network for the Leela Chess project. the weights are roughly 100Mb of ...
Oscar Smith's user avatar
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6 votes
3 answers
2k views

I'm trying to beat the native Double.TryParse for performance in parsing large multi-million row (simple) CSV files as much as possible. I do not have to support ...
Alain's user avatar
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