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Why does Sqrt[] only return positive values rather than +/-?

QUESTION FROM: Michael Gmirkin | 9 years ago BY: Eric Johnstone
Algebra , Mathematica , Mathematics , Wolfram Language
12
REPLIES
21.1K
VIEWS

Problem with Numerical Integration of Aspirin Synthesis Reaction

QUESTION FROM: Robin Hartley | 10 years ago BY: Robin Hartley
Chemical Engineering , Chemistry , Mathematics
12
REPLIES
14.2K
VIEWS

Solving a differential equation.

QUESTION FROM: Peter Nolan | 10 years ago BY: Peter Nolan
Equation Solving , Mathematics , Wolfram|Alpha
12
REPLIES
10.5K
VIEWS

Some hard numerical integrations Specific example provided

QUESTION FROM: Stven Maths | 10 years ago BY: Updating Name
Calculus , Mathematics , Physics
12
REPLIES
8.3K
VIEWS

PolarConversiion

QUESTION FROM: John Lutz | 10 years ago BY: John Lutz
Mathematica , Mathematics
12
REPLIES
9K
VIEWS

Fundamental question about symbolic capabilities of Wolfram Language

QUESTION FROM: Atriya Sen | 10 years ago BY: Atriya Sen
Mathematics , Physics , Symbolic Computations , Wolfram Language
12
REPLIES
10.4K
VIEWS

Finding a specific solution to an ODE system

QUESTION FROM: Mike Jones | 10 years ago BY: Mike Jones
Mathematica , Mathematics , Physics , Wolfram Language
12
REPLIES
8.7K
VIEWS

solve equation system for five order

QUESTION FROM: Diego Leandro Suarez Solano | 11 years ago BY: Daniel Lichtblau
Equation Solving , Mathematics , Wolfram Language
12
REPLIES
8K
VIEWS

Mathematica function for # possible arrangements of items in bins?

QUESTION FROM: Douglas Youvan | 11 years ago BY: Douglas Youvan
Mathematics , Statistics and Probability
12
REPLIES
14.8K
VIEWS

Function: is n the sum of two primes?

QUESTION FROM: K L | 11 years ago BY: Udo Krause
Mathematica , Mathematics , Wolfram Language
12
REPLIES
16.3K
VIEWS

Optimal lighting configuration of 5 lamps in a square room

QUESTION FROM: Todd Rowland | 12 years ago BY: Todd Rowland
Architecture , Challenges , Engineering , Mathematics , Optics , ...
12
REPLIES
43.3K
VIEWS

Can Mathematica suss out a pattern in several functions, predict next one?

QUESTION FROM: Michael Gmirkin | 12 years ago BY: Michael Gmirkin
Mathematica , Mathematics
12
REPLIES
10.4K
VIEWS

FunctionRange with unit circle and fixed angle constraints takes long time

QUESTION FROM: Wen Dao | 27 days ago BY: Wen Dao
Mathematics , Tuning and Debugging , Wolfram Language
11
REPLIES
935
VIEWS

GraphImage2List: get numeric data from plot's images using image processing

CONTRIBUTED BY: Kotaro Okazaki | 6 months ago BY: Ahmed Elbanna
Staff Picks , Data Science , Dynamic Interactivity , ...
11
REPLIES
24.5K
VIEWS

Is the atlas 2 add-on no longer supported by anyone?

QUESTION FROM: Murray Eisenberg | 11 months ago BY: Di Zhang
External Programs and Systems , Geometry , Mathematica , ...
11
REPLIES
14.4K
VIEWS

How to prove the equality of two functions?

QUESTION FROM: Sasha Mandra | 1 year ago BY: Sasha Mandra
Algebra , Mathematics , Wolfram Language
11
REPLIES
3.4K
VIEWS

Is there any method to extract interpolation formula from NDSolve ?

QUESTION FROM: Leslaw Bieniasz | 1 year ago BY: Michael Rogers
Data Science , Mathematics , Modeling
11
REPLIES
3.1K
VIEWS

Obtaining permutations in a circle

QUESTION FROM: Yaw Antoa Onyina | 1 year ago BY: Hans Milton
Mathematics , Wolfram Language
11
REPLIES
3.9K
VIEWS

Stationary dynamics in DNA: a nonlinear Klein-Gordon approach

CONTRIBUTED BY: Athanasios Paraskevopoulos | 1 year ago BY: Sam Carrettie
Staff Picks , Biological Sciences , Calculus , ...
11
REPLIES
5.5K
VIEWS

Love heart jewelry I: 3D printing of parametric region

CONTRIBUTED BY: Frederick Wu | 1 year ago BY: Frederick Wu
Staff Picks , 3D Printing , Curated Data , Geometry , ...
11
REPLIES
25K
VIEWS

Comparison of Different Integration Results from FriCAS and Wolfram Language

QUESTION FROM: Hongyi Zhao | 1 year ago BY: Gianluca Gorni
Calculus , Mathematics , Wolfram Language
11
REPLIES
5.4K
VIEWS

Calculus of the perfectly centered break of a perfectly aligned pool ball rack

CONTRIBUTED BY: Jim Belk | 1 year ago BY: Ahmed Elbanna
Staff Picks , Computer-Based Maths , Geometry , Mathematics , ...
11
REPLIES
77.1K
VIEWS

Plotting solutions to an equation for varying parameter value produces empty graphs

QUESTION FROM: Ian P | 2 years ago BY: Gianluca Gorni
Algebra , Equation Solving , Graphics and Visualization , ...
11
REPLIES
3.5K
VIEWS

[WSS18] Algebraic Computations over Tropical Semi-Ring

CONTRIBUTED BY: Anjali Raj | 2 years ago BY: Peter Hecht
Staff Picks , Algebra , Geometry , Graphs and Networks , ...
11
REPLIES
12.7K
VIEWS

How to estimate the area and volume of the dam reservoir from the satellite image?

QUESTION FROM: Erfan Abdi | 2 years ago BY: Navvye Anand
Calculus , Geographic Information System , ...
11
REPLIES
4.8K
VIEWS

What is the winter solstice?

CONTRIBUTED BY: Jose Martin-Garcia | 2 years ago BY: Jose Martin-Garcia
Staff Picks , Astronomy , Curated Data , Earth Science , ...
11
REPLIES
8.3K
VIEWS

Determine the mirror reflection between the coordinates of a pire of points

QUESTION FROM: Hongyi Zhao | 2 years ago BY: Hongyi Zhao
Geometry , Mathematics , Wolfram Language
11
REPLIES
3.7K
VIEWS

Optimize search for rational numbers on unit circle?

QUESTION FROM: Vitaliy Kaurov | 2 years ago BY: Jari Kirma
High-Performance Computing , Mathematics , Numerical Computation , ...
11
REPLIES
7.1K
VIEWS

No "mathematical" input template for common differentiation with 2 variable

QUESTION FROM: David Stork | 3 years ago BY: Gianluca Gorni
Mathematics , User Interface , Wolfram Language
11
REPLIES
5K
VIEWS

Lots of substitution tilings

CONTRIBUTED BY: Ed Pegg | 3 years ago BY: John Berglund
Staff Picks , Demonstrations , Dynamic Interactivity , Geometry , ...
11
REPLIES
27K
VIEWS

Solving integration for some parameters?

QUESTION FROM: M M | 3 years ago BY: Gianluca Gorni
Calculus , Mathematics , Statistics and Probability , Wolfram Language
11
REPLIES
6.5K
VIEWS

Point rotation in Quaternion?

QUESTION FROM: A Kim | 3 years ago BY: A Kim
Algebra , Graphics and Visualization , Mathematics , Wolfram Language
11
REPLIES
4K
VIEWS

Find semi-prime factors; program runs but doesn't compute

QUESTION FROM: Bobby Joe Snyder | 3 years ago BY: Bobby Joe Snyder
Mathematics , Wolfram Language
11
REPLIES
6.8K
VIEWS

YouTube quizzes: Share your Wolfram Language solution!

CONTRIBUTED BY: Raspi Rascal | 3 years ago BY: xzczd 　
Challenges , Geometry , Optimization , Mathematics , ...
11
REPLIES
14.6K
VIEWS

Error Derivative::novar in PDEs?

QUESTION FROM: Saleh Baradaran | 4 years ago BY: Saleh Baradaran
Algebra , Calculus , Equation Solving , Mathematics , Wolfram Language
11
REPLIES
4.3K
VIEWS

Calculate the derivative from experimental data?

QUESTION FROM: nahal ghanadi | 4 years ago BY: W. Craig Carter
Calculus , Mathematics , Wolfram Language
11
REPLIES
8K
VIEWS

[GIF] Riemann Hypothesis video from Quanta Magazine

CONTRIBUTED BY: Clayton Shonkwiler | 4 years ago BY: EDITORIAL BOARD
Staff Picks , Graphics and Visualization , Mathematics , ...
11
REPLIES
18.2K
VIEWS

Solving a system of nonlinear equations with inequality constraints

QUESTION FROM: Sabrina Chui | 4 years ago BY: Bill Nelson
Algebra , Equation Solving , Mathematics , Wolfram Language
11
REPLIES
6.1K
VIEWS

System overdetermined

QUESTION FROM: Yesenia Tapia | 5 years ago BY: Hans Dolhaine
Equation Solving , Mathematics , Numerical Computation , Physics , ...
11
REPLIES
5K
VIEWS

[CALL] ways to visualize COVID-19 simulation results?

CONTRIBUTED BY: Kyle Keane | 5 years ago BY: Kyle Keane
Staff Picks , Challenges , Computational Humanities , Data Science , ...
11
REPLIES
18.7K
VIEWS

Angle variable "escaped" from DynamicModule?

QUESTION FROM: Christopher Young | 5 years ago BY: Christopher Young
Algebra , Dynamic Interactivity , Geometry , ...
11
REPLIES
8.2K
VIEWS

Get 2D plot using Show and Point to "stay still"

QUESTION FROM: Christopher Young | 5 years ago BY: Christopher Young
Dynamic Interactivity , Geometry , Graphics and Visualization , ...
11
REPLIES
8.1K
VIEWS

Use ParametricPlot3D to plot a general circular cylinder?

QUESTION FROM: Mohammad Amir Khan | 5 years ago BY: Christopher Young
Geometry , Graphics and Visualization , Mathematics , Wolfram Language
11
REPLIES
18.4K
VIEWS

Alternating terms of two lists, as function.

CONTRIBUTED BY: Claudio Chaib | 6 years ago BY: Claudio Chaib
Discrete Mathematics , Mathematics , Operations Research , ...
11
REPLIES
9.7K
VIEWS

Find Fit a function

QUESTION FROM: RCS LV | 6 years ago BY: Tim Laska
Mathematics , Wolfram Language
11
REPLIES
9.9K
VIEWS

NIntegrate::slwcon warning for definite integration

QUESTION FROM: Haress Nazary | 6 years ago BY: Mariusz Iwaniuk
Calculus , Mathematics , Numerical Computation , Wolfram Language
11
REPLIES
6.5K
VIEWS

Efficiently solve this system of quadratic equations?

QUESTION FROM: C W | 6 years ago BY: Daniel Lichtblau
Equation Solving , Mathematics , Wolfram Language
11
REPLIES
6.5K
VIEWS

Solve analytically 1D transport equation?

QUESTION FROM: Natash A | 6 years ago BY: Tim Laska
Chemistry , Equation Solving , Mathematics , Symbolic Computations , ...
11
REPLIES
11.3K
VIEWS

Program the distance Jaro?

QUESTION FROM: Luis Ledesma | 7 years ago BY: Udo Krause
Computational Linguistics , Mathematics , Wolfram Language
11
REPLIES
13.9K
VIEWS

Obtain Prony Coefficients from the following data?

QUESTION FROM: Justin Hendrix | 7 years ago BY: Daniel Lichtblau
Data Science , Optimization , Mathematics , Physics , ...
11
REPLIES
7.6K
VIEWS

Compute the eigenvalues and eigenvectors of a matrix?

QUESTION FROM: John Thress | 7 years ago BY: Hans Dolhaine
Equation Solving , Mathematics , Symbolic Computations , ...
11
REPLIES
19.8K
VIEWS

Create named empty lists, name coming from another list?

QUESTION FROM: Paul Cleary | 7 years ago BY: Paul Cleary
Data Science , Mathematics , Wolfram Language
11
REPLIES
7.5K
VIEWS

2018 FIFA World Cup Football / Soccer Simulation

CONTRIBUTED BY: Francisco Rodríguez | 7 years ago BY: Anne Summers
Staff Picks , Curated Data , Data Science , ...
11
REPLIES
35.6K
VIEWS

Avoid the following density plot artifacts?

QUESTION FROM: cmutlu | 7 years ago BY: Gianluca Gorni
Equation Solving , Graphics and Visualization , Mathematics , ...
11
REPLIES
9.9K
VIEWS

Combine Plots into one using a loop?

QUESTION FROM: Betty Boo | 7 years ago BY: Neil Singer
Equation Solving , Graphics and Visualization , Mathematics , ...
11
REPLIES
10K
VIEWS

[Challenge] The Pink Triangle Problem

CONTRIBUTED BY: Marco Thiel | 7 years ago BY: Alec Titterton
Staff Picks , Challenges , Computer-Based Maths , Education , ...
11
REPLIES
23.3K
VIEWS

[?] Plot an Archimedean Spiral with equidistant points?

QUESTION FROM: Nikki Peter | 7 years ago BY: Nikki Peter
Calculus , Geometry , Graphics and Visualization , Mathematics , ...
11
REPLIES
11.3K
VIEWS

What algorithm does NSolve use for real solutions of underdetermined system

QUESTION FROM: dbm368 | 7 years ago BY: Updating Name
Equation Solving , Mathematics , Numerical Computation , ...
11
REPLIES
9K
VIEWS

Avoid old issue with Limit[Abs[Sign[x*Sin[1/x]]],x->0] = 1 ?

QUESTION FROM: Tigran Aivazian | 7 years ago BY: Daniel Lichtblau
Calculus , Mathematics , Wolfram Language
11
REPLIES
6.9K
VIEWS

[?] Calculate the power spectral density of frequency modulated process?

QUESTION FROM: Leonid Ryazantsev | 7 years ago BY: Leonid Ryazantsev
Mathematics , Statistics and Probability , Wolfram Language
11
REPLIES
10.3K
VIEWS

Probability distribution of two numbers randomly changing?

QUESTION FROM: Ulrich Utiger | 8 years ago BY: Ulrich Utiger
Algebra , Calculus , Mathematics , Statistics and Probability , ...
11
REPLIES
11.6K
VIEWS

Perform a numerical integration?

QUESTION FROM: sahad dubai | 8 years ago BY: sahad dubai
Mathematics , Numerical Computation , Wolfram Language
11
REPLIES
5.2K
VIEWS

Plot inverse functions?

QUESTION FROM: Devin Luu | 8 years ago BY: Devin Luu
Graphics and Visualization , Mathematics , Wolfram Language
11
REPLIES
18.8K
VIEWS

Solve a system of 8 equations with 8 variables using NSolve?

QUESTION FROM: Josh Wofford | 8 years ago BY: Valeriu Ungureanu
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
11
REPLIES
9.8K
VIEWS

Interdependent optimization of two functions?

QUESTION FROM: S G | 8 years ago BY: Brad Klee
Optimization , Mathematics , Wolfram Language
11
REPLIES
10.3K
VIEWS

Draw a ParametricPlot3D space curve as an arrow?

QUESTION FROM: Werner Geiger | 8 years ago BY: Gianluca Gorni
Graphics and Visualization , Mathematics , Wolfram Language , ...
11
REPLIES
13.6K
VIEWS

Find the optimal virtual phone numbers to buy for X customers area codes?

QUESTION FROM: David Johnston | 8 years ago BY: CJ B
Data Science , Machine Learning , Optimization , Mathematics , ...
11
REPLIES
18.9K
VIEWS

Solve this stubborn integration?

QUESTION FROM: Wissam Jassim | 8 years ago BY: Hiren Patel
Equation Solving , Mathematics , Symbolic Computations , ...
11
REPLIES
8.4K
VIEWS

Using a 'Do' loop to redefine my 'For' loop function?

QUESTION FROM: Brandon Davis | 9 years ago BY: Brandon Davis
Mathematics , Wolfram Language
11
REPLIES
6.2K
VIEWS

Differences in 3 Dimensional objects?

QUESTION FROM: Rick Tschudin | 9 years ago BY: Updating Name
3D Printing , Geometry , Graphics and Visualization , Mathematics , ...
11
REPLIES
11.3K
VIEWS

Calculate percentage change in a time series?

QUESTION FROM: Kelly O | 9 years ago BY: Sander Huisman
Mathematics , Wolfram|Alpha , Wolfram Language
11
REPLIES
9.8K
VIEWS

Output as ordered pair (5, -2)?

QUESTION FROM: Mark Greenberg | 9 years ago BY: Sander Huisman
Mathematics , Wolfram Development Platform , Wolfram Language
11
REPLIES
13.3K
VIEWS

Visualization of happy and sad numbers

QUESTION FROM: Anonymous User | 9 years ago BY: Anonymous User
Discrete Mathematics , Graphics and Visualization , ...
11
REPLIES
9.2K
VIEWS

Determine branch cuts of say log[Z^3]?

QUESTION FROM: Patrick Rose | 9 years ago BY: Mariusz Iwaniuk
Mathematics , Symbolic Computations , Wolfram Language
11
REPLIES
12.6K
VIEWS

Solve with ConditionalExpression at boundary?

QUESTION FROM: Mikael Hakman | 9 years ago BY: Mikael Hakman
Equation Solving , Mathematics , Physics , Symbolic Computations , ...
11
REPLIES
6K
VIEWS

Existence of Real Roots to Coupled Polynomial Equations

QUESTION FROM: Frank Kampas | 10 years ago BY: Daniel Lichtblau
Mathematics , Wolfram Language
11
REPLIES
4.1K
VIEWS

Looking for (mathematical) function represented by [[x]]?

QUESTION FROM: Barbara Mahnke | 10 years ago BY: David Reiss
Mathematics
11
REPLIES
5.7K
VIEWS

Convergence of numerical integration with parameter

QUESTION FROM: Ramiro Serra | 10 years ago BY: Updating Name
Calculus , Mathematics , Wolfram Language
11
REPLIES
7.2K
VIEWS

Histogram problem

QUESTION FROM: Mikel Antoñana | 10 years ago BY: Sander Huisman
Mathematics , Numerical Computation , Wolfram Language
11
REPLIES
9.7K
VIEWS

Curlicue Fractals

CONTRIBUTED BY: Ed Pegg | 10 years ago BY: Vitaliy Kaurov
Graphics and Visualization , Mathematics , Visual Arts , ...
11
REPLIES
22.2K
VIEWS

2D gaussian nonlinearmodefit

QUESTION FROM: fary farfar | 10 years ago BY: Jim Baldwin
Mathematics
11
REPLIES
7K
VIEWS

Need serious help with lists!

QUESTION FROM: Nathan Lundholm | 10 years ago BY: Nathan Lundholm
Aerospace Engineering , Astronomy , Computer Science , ...
11
REPLIES
12.2K
VIEWS

FindRoot help with precision and accuracy

QUESTION FROM: Miguel Olivo-V | 10 years ago BY: Frank Kampas
Equation Solving , Mathematica , Mathematics , ...
11
REPLIES
22.9K
VIEWS

Definite integral of gaussian times sqare root of x gives wrong result

CONTRIBUTED BY: Wolfgang Brehm | 10 years ago BY: Wolfgang Brehm
Algebra , Mathematics , Symbolic Computations , Wolfram|Alpha
11
REPLIES
15.7K
VIEWS

Control + 9 Crash in Mathematica 10

QUESTION FROM: Dean Sparrow | 10 years ago BY: Tugrul Temel
Mathematics
11
REPLIES
8.9K
VIEWS

Change the value of the built-in constant Pi ?

QUESTION FROM: Dale Robinson | 11 years ago BY: Dale Robinson
Geometry , Mathematica , Mathematics , Wolfram Language
11
REPLIES
16.6K
VIEWS

Producing a particular integer sequence

QUESTION FROM: Yery Spark | 11 years ago BY: Udo Krause
Mathematica , Mathematics
11
REPLIES
4.6K
VIEWS

How to perform a correspondence analysis?

QUESTION FROM: Leo Hamminger | 11 years ago BY: André Dauphiné
Education , Mathematica , Mathematics , Social Science , ...
11
REPLIES
18.2K
VIEWS

Fruit grid sums

QUESTION FROM: Luis Ledesma | 11 years ago BY: Marco Thiel
Game Development , Mathematica , Mathematics , Recreation , ...
11
REPLIES
12.8K
VIEWS

Can I Plot Multiple 2D Graph Slices as a Single Integrated 3D Graph?

QUESTION FROM: Michael Gmirkin | 11 years ago BY: Michael Gmirkin
Graphics and Visualization , Mathematica , Mathematics , ...
11
REPLIES
17K
VIEWS

Vectors and fixed points in a 3D plot

QUESTION FROM: kritikaros kritikaros | 11 years ago BY: kritikaros kritikaros
Graphics and Visualization , Mathematica , Mathematics
11
REPLIES
4.4K
VIEWS

FloquetMatrix and FundamentalMatrix from Mathematica Journal article

QUESTION FROM: madhvig Gupta | 12 years ago BY: madhvig Gupta
Mathematica , Mathematics , Packages
11
REPLIES
6.5K
VIEWS

Mathematica Beyond Mathematics: The Wolfram Language in the Real World

CONTRIBUTED BY: JOSÉ GUILLERMO SÁNCHEZ LEÓN | 5 months ago BY: Ray Rischpater
Staff Picks , Computer-Based Maths , Curated Data , Data Science , ...
10
REPLIES
9.3K
VIEWS

Possible error in solving Improper integral

QUESTION FROM: José Luis Garrido | 5 months ago BY: Daniel Lichtblau
Calculus , Mathematics , Numerical Computation , Wolfram Language
10
REPLIES
1.3K
VIEWS

How to specify incremental constraint in LongestOrderedSequence?

QUESTION FROM: Richard Frost | 10 months ago BY: Michael Rogers
Discrete Mathematics , Mathematics , Signal Processing , ...
10
REPLIES
2.5K
VIEWS

Visualizing Minkowski's theorem

CONTRIBUTED BY: Diego Ramos | 10 months ago BY: Diego Ramos
Staff Picks , Dynamic Interactivity , Graphics and Visualization , ...
10
REPLIES
3.9K
VIEWS

Forcing Solve to give real-valued root

QUESTION FROM: Paul R | 11 months ago BY: Michael Rogers
Algebra , Mathematics , Symbolic Computations , Wolfram Language
10
REPLIES
1.8K
VIEWS

Wolfram's Rule 30 contest

CONTRIBUTED BY: Todd Rowland | 11 months ago BY: David Gallimore
Challenges , Computational Systems , Computer Science , ...
10
REPLIES
15.8K
VIEWS

How to define and evaluate the so-called 'Hadamard Product' with symbolic arrays?

QUESTION FROM: Alberto Silva Ariano | 1 year ago BY: Michael Rogers
Algebra , Mathematics , Wolfram Language
10
REPLIES
3.3K
VIEWS

Is it possible to plot multiple functions each in diffrent regions?

QUESTION FROM: Kevin Holm | 1 year ago BY: Michael Rogers
Graphics and Visualization , Mathematics , Wolfram Language
10
REPLIES
7.6K
VIEWS
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6190 Discussions

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