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A problem with using NDsolve, please help.

QUESTION FROM: Gil Bor | 10 years ago BY: Gil Bor
Equation Solving , Mathematics , Wolfram Language
7
REPLIES
10K
VIEWS

Solve system of linear Diophantine equations with conditions

QUESTION FROM: Juan Frias | 10 years ago BY: Frank Kampas
Equation Solving , Mathematica , Mathematics
7
REPLIES
11.7K
VIEWS

What is Entropy function ?

QUESTION FROM: André Dauphiné | 11 years ago BY: Sam Carrettie
Data Science , Mathematics , Statistics and Probability , ...
7
REPLIES
9.8K
VIEWS

Desired behavior of Collect[]

QUESTION FROM: Konstantin Nosov | 11 years ago BY: Eric Johnstone
Algebra , Mathematics , Symbolic Computations , Wolfram Language
7
REPLIES
7.3K
VIEWS

Fitting a data set to an equation to get constants

QUESTION FROM: math p | 11 years ago BY: math p
Data Science , Mathematics , Wolfram Language
7
REPLIES
13.6K
VIEWS

How to use SolveAlways for long multivariable polynomials

QUESTION FROM: J Jesus Rico-Melgoza | 11 years ago BY: Daniel Lichtblau
Mathematics , Wolfram Language
7
REPLIES
5.9K
VIEWS

Is PolyhedronData a list?

QUESTION FROM: Vijay Sharma | 11 years ago BY: Vijay Sharma
Curated Data , Geometry , Mathematics , Wolfram Language
7
REPLIES
10.4K
VIEWS

Making mountain 3D videos

QUESTION FROM: Luis Ledesma | 11 years ago BY: Luis Ledesma
Augmented and Virtual Realities , Authoring and Publishing , ...
7
REPLIES
16.5K
VIEWS

Random selection of pairs

QUESTION FROM: gmauser Mauser | 11 years ago BY: gmauser Mauser
Mathematics
7
REPLIES
11.8K
VIEWS

Weaire–Phelan structure in mathematica

QUESTION FROM: Luis Ledesma | 11 years ago BY: Luis Ledesma
Architecture , Geometry , Mathematics , Wolfram Language
7
REPLIES
19.9K
VIEWS

Intersection of two Conics

QUESTION FROM: Kim Hutchison | 11 years ago BY: Kim Hutchison
Mathematics
7
REPLIES
5.3K
VIEWS

How do I define this function with the WL? b[a_ , t_] := a'[t] Sin[a[t]];

QUESTION FROM: Amir Arshia | 11 years ago BY: Amir Arshia
Mathematics , Wolfram Language
7
REPLIES
8.3K
VIEWS

Why does the command "where" work not always?

QUESTION FROM: Robert Slanski | 11 years ago BY: Robert Slanski
Calculus , Demonstrations , Mathematics , Wolfram|Alpha , ...
7
REPLIES
21.2K
VIEWS

Bug in LaguerreL Limit ?

QUESTION FROM: Mariusz Iwaniuk | 11 years ago BY: Daniel Lichtblau
Calculus , Mathematica , Mathematics , Wolfram|Alpha , ...
7
REPLIES
15.9K
VIEWS

Strange behavior of Round[x_, .1] -- I want Round[2.40, .1] to be 2.4

QUESTION FROM: Elaine Kant | 11 years ago BY: John Doty
Mathematica , Mathematics , Numerical Computation
7
REPLIES
9.3K
VIEWS

Insert or Joint a element in a table

QUESTION FROM: margherita ferrucci | 11 years ago BY: David Gathercole
Civil Engineering , Education , Engineering , Finance , ...
7
REPLIES
17.7K
VIEWS

Debugging the code for pricing European option

QUESTION FROM: Kausik Datta | 11 years ago BY: David Gathercole
Economics , Finance , Mathematics , Modeling , Wolfram Language
7
REPLIES
13.8K
VIEWS

Listing objects under conditions

QUESTION FROM: Richard KAUSCH | 11 years ago BY: Kuba Podkalicki
Mathematics
7
REPLIES
6.1K
VIEWS

How to plot the Joukowski curve...?

QUESTION FROM: Simon Cadrin | 11 years ago BY: Simon Cadrin
Graphics and Visualization , Mathematics , Physics , Wolfram Language
7
REPLIES
6.6K
VIEWS

How to plot the complex equation in 2D ...?

QUESTION FROM: Simon Cadrin | 11 years ago BY: Sam Carrettie
Calculus , Mathematics
7
REPLIES
9.3K
VIEWS

Fit a curve using dated data formatted for DateListPlot?

QUESTION FROM: Jack Calman | 11 years ago BY: Jos Klaps
Graphics and Visualization , Mathematics , Modeling , Wolfram Language
7
REPLIES
11.2K
VIEWS

How do I ratio to very small values and avoid rounding to unity?

QUESTION FROM: Luther Nayhm | 11 years ago BY: Luther Nayhm
Optimization , Mathematics
7
REPLIES
5.8K
VIEWS

How entering the following differential equation in mathematica

QUESTION FROM: Luis Ledesma | 11 years ago BY: Luis Ledesma
Calculus , Mathematica , Mathematics , Wolfram Language
7
REPLIES
10K
VIEWS

MLE: NMaximize vs FindDistributionParameters

QUESTION FROM: Sandu Ursu | 11 years ago BY: Bruce Miller
Finance , Mathematics , Statistics and Probability
7
REPLIES
9.3K
VIEWS

Trying to find visit all the city parks in Great Falls, Montana

QUESTION FROM: Patrick Wolf | 11 years ago BY: Vitaliy Kaurov
Graphics and Visualization , Optimization , Mathematics , ...
7
REPLIES
14.7K
VIEWS

How to get the same FFT result in Mathematica?

QUESTION FROM: Luis Ledesma | 12 years ago BY: Frank Kampas
Mathematics , Wolfram Language
7
REPLIES
7.1K
VIEWS

solve for highly nonlinear double variable, decoupled equation

QUESTION FROM: Palas Kar | 12 years ago BY: Palas Kar
Equation Solving , Mathematics , Wolfram Language
7
REPLIES
10.8K
VIEWS

mathematica command

QUESTION FROM: Lili88 luca | 12 years ago BY: David Reiss
Mathematica , Mathematics
7
REPLIES
7.3K
VIEWS

How to prove that Sum[2 i, {i, 1, n}] == n^2 + n

QUESTION FROM: Marco Thiel | 12 years ago BY: Daniel Lichtblau
Mathematics , Symbolic Computations , Wolfram Language
7
REPLIES
6.8K
VIEWS

Manipulation of lists.

QUESTION FROM: Anand Shankar Dyavanapalli | 12 years ago BY: Anand Shankar Dyavanapalli
Mathematics
7
REPLIES
3.4K
VIEWS

Replace[] malfunction?

QUESTION FROM: Sandu Ursu | 12 years ago BY: Isaac Abraham
Mathematics , Statistics and Probability , Symbolic Computations
7
REPLIES
5.8K
VIEWS

Beginner to Wolfram Alpha - keyboard shortcuts

QUESTION FROM: Joshua Hurn | 12 years ago BY: Leo Hamminger
Mathematics , User Interface , Wolfram|Alpha
7
REPLIES
15.6K
VIEWS

Fitting the data (need syntax help)

QUESTION FROM: Jaydeep Yadav | 12 years ago BY: Daniel Lichtblau
Mathematica , Mathematics , Modeling , Wolfram Language
7
REPLIES
10.7K
VIEWS

Is it possible to select numbers by their digit parity?

QUESTION FROM: Paul Cleary | 12 years ago BY: Mark Dooris
Mathematica , Optimization , Mathematics , Wolfram Language
7
REPLIES
14.8K
VIEWS

It's the same?, problem with the king of chess

QUESTION FROM: Luis Ledesma | 12 years ago BY: Luis Ledesma
Game Development , Mathematica , Mathematics , Recreation , ...
7
REPLIES
17.9K
VIEWS

FindRoot does not work

QUESTION FROM: Ana Squadri | 12 years ago BY: Bruce Miller
Equation Solving , Mathematics , Wolfram Language
7
REPLIES
20K
VIEWS

How do I make a nonlinear equation based on data I generate?

QUESTION FROM: Neil Greisman | 13 years ago BY: Neil Greisman
Equation Solving , Mathematica , Mathematics , Wolfram Language
7
REPLIES
6.8K
VIEWS

Volume of spherical cap

QUESTION FROM: beatriz hernandez | 13 years ago BY: EDITORIAL BOARD
Calculus , Mathematica , Mathematics
7
REPLIES
10.9K
VIEWS

Integrating a convolution in a specified domain

QUESTION FROM: azmi almasalha | 13 years ago BY: Bill Simpson
Calculus , Mathematica , Mathematics
7
REPLIES
6.3K
VIEWS

How to create a drawing pad in Mathematica?

QUESTION FROM: Boris Blankleider | 13 years ago BY: Vitaliy Kaurov
Dynamic Interactivity , Graphics and Visualization , ...
7
REPLIES
17.4K
VIEWS

Radius of a circle bisecting the area of a given circle

QUESTION FROM: Peter Bischet | 13 years ago BY: Peter Bischet
Calculus , Mathematica , Mathematics
7
REPLIES
7.6K
VIEWS

Why is Mathematica mis-behaving while finding roots of a simple polynomial?

QUESTION FROM: Prasiddh TRIVEDI | 13 years ago BY: Bruce Miller
Mathematics
7
REPLIES
6.5K
VIEWS

Can anybody post result of provided input to Mathematica?

QUESTION FROM: Andrew Zabavnikov | 13 years ago BY: Shenghui Yang
Algebra , Mathematica , Mathematics
7
REPLIES
7.1K
VIEWS

How do we decrease the computation time of this code?

QUESTION FROM: Bharath Krishnan | 2 days ago BY: Bharath Krishnan
Equation Solving , Mathematics , Tuning and Debugging , ...
6
REPLIES
71
VIEWS

Outer region of a polygon

QUESTION FROM: Frank Kampas | 2 months ago BY: Gianluca Gorni
Geometry , Graphics and Visualization , Mathematics , Wolfram Language
6
REPLIES
2.2K
VIEWS

Picking a specific output from a function in the selection parameter of Solve[]

QUESTION FROM: Mitchell Sandlin | 2 months ago BY: Eric Rimbey
Algebra , Equation Solving , Mathematics , Wolfram Language
6
REPLIES
365
VIEWS

Different outputs when using numerics vs variables

QUESTION FROM: Clifford Kelley | 6 months ago BY: Clifford Kelley
Mathematics , Wolfram Language
6
REPLIES
1.8K
VIEWS

Using DSolve butFailing to obtain a list of equations expected instead of True in the first argument

QUESTION FROM: Nomsa Ledwaba | 6 months ago BY: Gianluca Gorni
Calculus , Equation Solving , Mathematics , Wolfram Language
6
REPLIES
1.1K
VIEWS

Best optimization for maximum entropy?

QUESTION FROM: Gareth Russell | 7 months ago BY: Gareth Russell
Optimization , Mathematics , Numerical Computation , ...
6
REPLIES
1.4K
VIEWS

Solve numericizes after turning mathematica off and on again

QUESTION FROM: Luis Felipe Massena Misiec | 8 months ago BY: Luis Felipe Massena Misiec
Data Science , Equation Solving , Image Processing , Mathematics , ...
6
REPLIES
2.2K
VIEWS

Separating variables *a* and *b* in a transcendental equation

QUESTION FROM: Wen Dao | 8 months ago BY: Wen Dao
Algebra , Mathematics , Symbolic Computations , Wolfram Language
6
REPLIES
1.6K
VIEWS

Using NIntegrate with nested integrals

QUESTION FROM: Max Shpak | 9 months ago BY: Max Shpak
Calculus , Mathematics , Numerical Computation , Wolfram Language
6
REPLIES
1.7K
VIEWS

Why can't we find real and imaginary parts using Assuming?

QUESTION FROM: Ernst Huijer | 10 months ago BY: Eric Rimbey
Mathematics , Wolfram Language
6
REPLIES
1.4K
VIEWS

Checking whether Hessian matrix of a function is positive semidefinite on a hypercube

QUESTION FROM: Amir A. | 11 months ago BY: Amir A.
Algebra , Mathematics , Wolfram Language
6
REPLIES
1.9K
VIEWS

Need explanation for FullSimplify result of mathematical expression

QUESTION FROM: Sasha Mandra | 11 months ago BY: Sasha Mandra
Mathematics , Symbolic Computations , Wolfram Language
6
REPLIES
1.7K
VIEWS

Help finding max number of combinations of letters and numbers with constraints and create a list

QUESTION FROM: praveer escrow | 0 months ago BY: Ahmed Elbanna
Mathematics , Wolfram Language
6
REPLIES
3.5K
VIEWS

The roots of a mathematical expression

QUESTION FROM: Yahely Levy | 1 year ago BY: Khayahsi Obasi
Algebra , Equation Solving , Mathematics , Wolfram|Alpha
6
REPLIES
2.9K
VIEWS

Matrix inverse using singular value decomposition

QUESTION FROM: Charles Elliott | 1 year ago BY: Gianluca Gorni
Algebra , Mathematics , Wolfram Language
6
REPLIES
2.1K
VIEWS

Speeding up the fitting of a model with 23 parameters using NonLinearModelfit

QUESTION FROM: Rajesh Chell | 1 year ago BY: Jim Baldwin
Computer Science , Data Science , Mathematics , Modeling , ...
6
REPLIES
3.1K
VIEWS

Superfluous step in W|A step-by-step of implicit differentiation

QUESTION FROM: Aaron Naiman | 1 year ago BY: Aaron Naiman
Calculus , Mathematics , Wolfram|Alpha
6
REPLIES
2K
VIEWS

Proof of correctness for FindInstace

QUESTION FROM: Dan Feldman | 2 years ago BY: Daniel Lichtblau
Algebra , Equation Solving , Mathematics , Wolfram Language
6
REPLIES
2K
VIEWS

Unexpected output from DSolve

QUESTION FROM: Sami Heidari | 2 years ago BY: Sami Heidari
Calculus , Equation Solving , Mathematics , Symbolic Computations , ...
6
REPLIES
1.8K
VIEWS

Need help using Notation Package

QUESTION FROM: Jay Gourley | 2 years ago BY: Jay Gourley
Graphics and Visualization , Mathematics , Packages , Wolfram Language
6
REPLIES
3K
VIEWS

@@ doesn't work on TraditionalForm input

QUESTION FROM: Fredrik Erling | 2 years ago BY: Fredrik Erling
Mathematics , Wolfram Language
6
REPLIES
1.6K
VIEWS

Analytical solution of a system of linear ODEs

QUESTION FROM: Tapas Ray Mahapatra | 2 years ago BY: Michael Rogers
Calculus , Equation Solving , Mathematics , Symbolic Computations , ...
6
REPLIES
2.7K
VIEWS

What Wolfram products are helpful for learning and tutoring calculus?

QUESTION FROM: Mark Massy | 2 years ago BY: Updating Name
Calculus , Mathematics , Wolfram Language , Wolfram U
6
REPLIES
4.1K
VIEWS

How to get a simple system of recursion equations to give output?

QUESTION FROM: Iuval Clejan | 2 years ago BY: Iuval Clejan
Algebra , Equation Solving , Mathematics , Symbolic Computations , ...
6
REPLIES
2.7K
VIEWS

Solving system of equations gives empty output, but gives result when reduced

QUESTION FROM: Panron Ryan | 2 years ago BY: Gianluca Gorni
Algebra , Equation Solving , Mathematics , Symbolic Computations , ...
6
REPLIES
14.7K
VIEWS

MatrixSymbol simplifications

QUESTION FROM: Eric Michielssen | 2 years ago BY: Jose Martin-Garcia
Algebra , Mathematics , Symbolic Computations , Wolfram Language
6
REPLIES
3.4K
VIEWS

Help solving a cubic equation with a parameter

QUESTION FROM: Jackie cao | 2 years ago BY: Updating Name
Algebra , Equation Solving , Mathematics , Symbolic Computations , ...
6
REPLIES
2.6K
VIEWS

Numerical solution to Euler Lagrange equation

QUESTION FROM: Ee Kin Chan | 2 years ago BY: Ee Kin Chan
Equation Solving , Mathematics , Numerical Computation , Physics , ...
6
REPLIES
2.2K
VIEWS

Does anybody have problems with the output of NonlinearModelFit with 14.1?

QUESTION FROM: Stefano Vitale | 2 years ago BY: Stefano Vitale
Calculus , Data Science , Mathematics , Modeling , Wolfram Language
6
REPLIES
2.6K
VIEWS

Error from NDSolve: PDE coefficient doesn't evaluate to numerical value

QUESTION FROM: Nithiya V | 2 years ago BY: Nithiya V
Calculus , Equation Solving , Mathematics , Numerical Computation , ...
6
REPLIES
2.5K
VIEWS

Solving equation on boundaries

QUESTION FROM: Mnele Wolfram | 2 years ago BY: Mnele Wolfram
Equation Solving , Material Sciences , Mathematics , Physics , ...
6
REPLIES
2.4K
VIEWS

Using symbolic calculation result to evaluate real expression

QUESTION FROM: Thomas Fowler | 2 years ago BY: Thomas Fowler
Calculus , Mathematics , Physics , Symbolic Computations , ...
6
REPLIES
2.5K
VIEWS

\ddot in LaTeX inline objects

QUESTION FROM: Howard Georgi | 2 years ago BY: David Reiss
Mathematics , Physics , Presentation and Notebooks , Wolfram Language
6
REPLIES
3.3K
VIEWS

FilledCurve and lopsided mandalas

QUESTION FROM: Mark Greenberg | 2 years ago BY: Mark Greenberg
Geometry , Graphics and Visualization , Mathematics , Wolfram Language
6
REPLIES
3.5K
VIEWS

Solving nonlinear equation with integrals and beta functions

QUESTION FROM: Muhammad Fahem Bin Musa | 2 years ago BY: Bill Nelson
Algebra , Calculus , Equation Solving , Mathematics , ...
6
REPLIES
2.4K
VIEWS

Accessing matrix elements and evaluating terms multiplied by zero

QUESTION FROM: Arun KG | 2 years ago BY: Arun KG
Algebra , Mathematics , Wolfram Language
6
REPLIES
3.6K
VIEWS

Plotting issue with multiple parameter

QUESTION FROM: Debojyoti Mondal | 2 years ago BY: Debojyoti Mondal
Graphics and Visualization , Mathematics , Wolfram Language
6
REPLIES
2K
VIEWS

Surface Area problem with double integral confusion

QUESTION FROM: Jackson Singleton | 2 years ago BY: Gianluca Gorni
Calculus , Mathematics , Wolfram Language
6
REPLIES
3K
VIEWS

Manipulate doesn't work on fresh kernel

QUESTION FROM: Andrea Naticchi | 2 years ago BY: EDITORIAL BOARD
Discrete Mathematics , Dynamic Interactivity , Equation Solving , ...
6
REPLIES
2.5K
VIEWS

Table of NSolve (and Solve) solutions creates extra unknown answers

QUESTION FROM: Ilan Riess | 2 years ago BY: Ilan Riess
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
6
REPLIES
2.6K
VIEWS

Ahmed Integral doesn't evaluate

QUESTION FROM: José Luis Garrido | 2 years ago BY: José Luis Garrido
Calculus , Mathematics , Wolfram Language
6
REPLIES
6K
VIEWS

Getting Wrong Numbers in Output for a Quantum Mechanics problem

QUESTION FROM: خالد رافع | 2 years ago BY: Gianluca Gorni
Equation Solving , Mathematics , Physics , Symbolic Computations , ...
6
REPLIES
2.1K
VIEWS

Unable to Simplify non-commutative Expression Further

QUESTION FROM: Hongyi Zhao | 2 years ago BY: Mauricio de Oliveira
Algebra , Mathematics , Wolfram Language
6
REPLIES
5.1K
VIEWS

Probability that two correlated Normal random variables have the same sign?

QUESTION FROM: Greg Sternberg | 2 years ago BY: Gianluca Gorni
Mathematics , Statistics and Probability , Wolfram Language
6
REPLIES
7.1K
VIEWS

Plot with and without `Table` produce different results

QUESTION FROM: Ian P | 3 years ago BY: Updating Name
Algebra , Calculus , Equation Solving , Graphics and Visualization , ...
6
REPLIES
3.2K
VIEWS

Infinite expression 1/0 encountered when evaluating a non-singular polynomial

QUESTION FROM: Mathias Gschwendtner | 3 years ago BY: Mathias Gschwendtner
Algebra , Mathematics , Wolfram Language
6
REPLIES
4.7K
VIEWS

3D graphics overlaying with show function

QUESTION FROM: Jianhua Yang | 3 years ago BY: Jianhua Yang
Graphics and Visualization , Mathematics , Wolfram Language
6
REPLIES
3.2K
VIEWS

Integer inside [] is unexpectedly changed to a machine-precision real number

QUESTION FROM: Aki Hiro | 3 years ago BY: Aki Hiro
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
6
REPLIES
3.6K
VIEWS

Numerical integration with large initial limit

QUESTION FROM: Safinaz Salem | 3 years ago BY: Safinaz Salem
Calculus , Mathematics , Numerical Computation , Wolfram Language
6
REPLIES
3.2K
VIEWS

What method is there to retrieve which quantity to replace and complete factorization?

QUESTION FROM: Lee Tao | 3 years ago BY: Gianluca Gorni
Algebra , Mathematics , Wolfram Language
6
REPLIES
4K
VIEWS

How to improve the accuracy of FindRoot or NDSolveValue at extreme conditions in my equation system?

QUESTION FROM: Mikoto Misaka | 3 years ago BY: Gianluca Gorni
Algebra , Equation Solving , Graphics and Visualization , ...
6
REPLIES
5.8K
VIEWS

Speed up Nintegrate for certain range of function's input

QUESTION FROM: John Wick | 3 years ago BY: Gianluca Gorni
Calculus , Mathematics , Numerical Computation , Wolfram Language
6
REPLIES
3.6K
VIEWS

Cut wood to minimize loss

QUESTION FROM: Nicholas Kormanik | 3 years ago BY: Nicholas Kormanik
Algebra , Optimization , Mathematics , Wolfram Language
6
REPLIES
4.8K
VIEWS

Solving a specific initial value problem

QUESTION FROM: Felix Toperczer | 3 years ago BY: Roland Franzius
Calculus , Equation Solving , Mathematics , Numerical Computation , ...
6
REPLIES
6.3K
VIEWS

NDSolve error: Cannot solve to find an explicit formula for the derivatives

QUESTION FROM: Anand Mathew | 3 years ago BY: Michael Rogers
Equation Solving , Graphics and Visualization , Mathematics , ...
6
REPLIES
5.1K
VIEWS

Integrals evaluating to zero

QUESTION FROM: Ingryd Passos | 3 years ago BY: Daniel Lichtblau
Calculus , Mathematics , Wolfram Language
6
REPLIES
4K
VIEWS

Different results from two equal functions?

QUESTION FROM: Leon Fairbanks | 3 years ago BY: Leon Fairbanks
Algebra , Mathematics , Wolfram Language
6
REPLIES
4K
VIEWS
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