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NDSolve error: Equation or list of equations expected

QUESTION FROM: Md Taj | 4 years ago BY: Md Taj
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
2
REPLIES
3.2K
VIEWS

Calculate generalized eigenvector using Jordan normal form.

QUESTION FROM: Hongyi Zhao | 4 years ago BY: Hongyi Zhao
Algebra , Mathematics , Wolfram Language
2
REPLIES
3.6K
VIEWS

How to simplify an expression through variable substitution?

QUESTION FROM: Chenjia Zhang | 4 years ago BY: Bill Nelson
Algebra , Equation Solving , Mathematics , Wolfram Language
2
REPLIES
4K
VIEWS

Precision of numerical series value in Wolfram|Alpha

QUESTION FROM: Yuri Artamonov | 4 years ago BY: Yuri Artamonov
Algebra , Calculus , Mathematics , Wolfram|Alpha , Wolfram Language
2
REPLIES
3.3K
VIEWS

Break ParallelTable once a valid result is obtained.

QUESTION FROM: Hongyi Zhao | 4 years ago BY: Hongyi Zhao
Algebra , Equation Solving , High-Performance Computing , ...
2
REPLIES
3K
VIEWS

About the norm determination algorithm used by Eigenvectors[ ]

QUESTION FROM: Hongyi Zhao | 4 years ago BY: Hongyi Zhao
Algebra , Mathematics , Wolfram Language
2
REPLIES
2.7K
VIEWS

[GiF] Engel 38-sided space-filling polyhedron

CONTRIBUTED BY: Ed Pegg | 4 years ago BY: Ed Pegg
Staff Picks , Algebra , Computer-Based Maths , Geometry , ...
2
REPLIES
19.3K
VIEWS

Composite function does not work as expected

QUESTION FROM: Hongyi Zhao | 4 years ago BY: Hongyi Zhao
Algebra , Mathematics , Wolfram Language
2
REPLIES
3K
VIEWS

Iterating tiltedsinewave discretizes vehemently

CONTRIBUTED BY: Bill Gosper | 4 years ago BY: Henrik Schachner
Staff Picks , Algebra , Calculus , Computer-Based Maths , ...
2
REPLIES
6.4K
VIEWS

Optimize the efficiency of outer product when generating group elements

QUESTION FROM: Hongyi Zhao | 4 years ago BY: Hongyi Zhao
Algebra , Group Theory , Mathematics , Wolfram Language
2
REPLIES
3.5K
VIEWS

Unexpected number of solutions from Solve with system of equations?

QUESTION FROM: Jürgen Kanz | 4 years ago BY: Jürgen Kanz
Algebra , Equation Solving , Mathematics , Wolfram Engine , ...
2
REPLIES
4.6K
VIEWS

Different numerical equation results between Mathematica and Wolfram|Alpha

QUESTION FROM: Chenghua Deng | 4 years ago BY: Chenghua Deng
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
2
REPLIES
3.8K
VIEWS

How do I get filled closed B-splines with discrete weights?

QUESTION FROM: Claudio Argento | 4 years ago BY: J. M.
Algebra , Graphics and Visualization , Wolfram Language
2
REPLIES
6.7K
VIEWS

Analyzing a competitive new method for GenerateTiling

CONTRIBUTED BY: Brad Klee | 4 years ago BY: Brad Klee
Staff Picks , Algebra , Challenges , Discrete Mathematics , ...
2
REPLIES
6.7K
VIEWS

Discovering symbolic square roots?

QUESTION FROM: Yaroslav Bulatov | 4 years ago BY: Yaroslav Bulatov
Algebra , Mathematica , Wolfram Language
2
REPLIES
6.8K
VIEWS

Speeding up Boussinesq equations solving?

QUESTION FROM: Lion Sahara | 4 years ago BY: Lion Sahara
Algebra , Equation Solving , Geometry , Mathematics , Modeling , ...
2
REPLIES
3.9K
VIEWS

How to convert the hypergeometric function solution to a Bessel's solution?

QUESTION FROM: KRISHAN SHARMA | 4 years ago BY: KRISHAN SHARMA
Algebra , Calculus , Mathematics , Wolfram Language
2
REPLIES
5.2K
VIEWS

Wolfram|Alpha displays only one integer root out of infinity

QUESTION FROM: Seojune Kim | 4 years ago BY: Seojune Kim
Algebra , Equation Solving , Wolfram|Alpha
2
REPLIES
3.6K
VIEWS

HornerForm doesn't produce expected form?

QUESTION FROM: Leslaw Bieniasz | 4 years ago BY: Jim Baldwin
Algebra , Mathematics , Wolfram Language
2
REPLIES
4.7K
VIEWS

How to obtain 3x3 matrices as output from the computation of 2x2 matrices

QUESTION FROM: Nomsa Ledwaba | 4 years ago BY: Nomsa Ledwaba
Algebra , Mathematics , Wolfram Language
2
REPLIES
6K
VIEWS

Brillhart's Cubic and e^(Sqrt[163] π)

CONTRIBUTED BY: Ed Pegg | 4 years ago BY: Ed Pegg
Algebra , Mathematics , Wolfram Language
2
REPLIES
8.1K
VIEWS

Finding linear mapping between two matrices

QUESTION FROM: Gozde USTUN | 4 years ago BY: Gozde USTUN
Algebra , Mathematics , Wolfram Language
2
REPLIES
3.3K
VIEWS

How to write X= (A->B) V C in Wolfram|Alpha?

QUESTION FROM: Joe Weber | 4 years ago BY: Joe Weber
Algebra , Mathematics , Wolfram|Alpha
2
REPLIES
3.9K
VIEWS

Rearrange function's terms to prove it is nonnegative?

QUESTION FROM: criterion lover | 4 years ago BY: criterion lover
Algebra , Calculus , Mathematics , Wolfram Language
2
REPLIES
2.7K
VIEWS

Difference quotient solution: numeric value instead of variable

QUESTION FROM: Winslow K | 4 years ago BY: Eric Rimbey
Algebra , Mathematics , Wolfram Language
2
REPLIES
3.6K
VIEWS

Computing the entanglement entropy with Wolfram Quantum Framework

CONTRIBUTED BY: Aditya Dhumuntarao | 4 years ago BY: Aditya Dhumuntarao
Staff Picks , Algebra , Equation Solving , Mathematics , Packages , ...
2
REPLIES
12K
VIEWS

FindRoot with Integration does not give results?

QUESTION FROM: Zee Khan | 4 years ago BY: Zee Khan
Algebra , Calculus , Equation Solving , Mathematics , ...
2
REPLIES
4.3K
VIEWS

Compute the prime implicants of a Boolean function?

QUESTION FROM: Francisco Gutierrez | 4 years ago BY: Francisco Gutierrez
Algebra , Logic and Boolean Algebra , Mathematics , Wolfram Language
2
REPLIES
5.4K
VIEWS

Help with operations with vectors and quaternions?(solved)

QUESTION FROM: J Decker | 4 years ago BY: J Decker
Algebra , Geometry , Graphics and Visualization , Mathematics , ...
2
REPLIES
4K
VIEWS

Move prefactor inside radical

QUESTION FROM: Steven Kaptein | 4 years ago BY: Steven Kaptein
Algebra , Symbolic Computations , Wolfram Language
2
REPLIES
3.6K
VIEWS

BesselK interpretation in Wolfram Alpha?

QUESTION FROM: Martin H. | 4 years ago BY: Martin H.
Algebra , Mathematics , Wolfram|Alpha
2
REPLIES
4.3K
VIEWS

Using TrigExpand to expand inside another function

QUESTION FROM: Steven Kaptein | 4 years ago BY: Steven Kaptein
Algebra , Calculus , Symbolic Computations , Wolfram Language
2
REPLIES
4.2K
VIEWS

Solve goes into infinite loop, when solving a quadratic equation system

QUESTION FROM: Ralph Trenkler | 5 years ago BY: Daniel Lichtblau
Algebra , Equation Solving , Mathematics , Symbolic Computations , ...
2
REPLIES
5.7K
VIEWS

Why does Arg[z] remains unsolved while extracting Real & Imaginary Parts?

QUESTION FROM: Aslam Kittur | 5 years ago BY: Aslam Kittur
Algebra , Calculus , Equation Solving , Mathematics , Wolfram Language
2
REPLIES
4.8K
VIEWS

Solving for value inside matrix

QUESTION FROM: Kaylea Anderson | 5 years ago BY: Gianluca Gorni
Algebra , Equation Solving , Mathematics , Wolfram Language
2
REPLIES
4.8K
VIEWS

Piecewise function evaluation and Plot too slow

QUESTION FROM: Andre Luiz Rocha Alves | 5 years ago BY: Andre Luiz Rocha Alves
Algebra , Graphics and Visualization , Mathematics , Wolfram Language
2
REPLIES
3.4K
VIEWS

Consistent vector length across plots using VectorPlot[ ]?

QUESTION FROM: Tobias Eklund | 5 years ago BY: Tobias Eklund
Algebra , Graphics and Visualization , Mathematics , Wolfram Language
2
REPLIES
4.6K
VIEWS

Operations with arrays (pseudoinverses & products)

CONTRIBUTED BY: Alberto Silva Ariano | 5 years ago BY: Alberto Silva Ariano
Staff Picks , Algebra , Computer-Based Maths , Mathematics , ...
2
REPLIES
6.8K
VIEWS

How to change the form of a matrix?

QUESTION FROM: Julien Monette | 5 years ago BY: Julien Monette
Algebra , Mathematics , Wolfram Language
2
REPLIES
3K
VIEWS

Explore S. Rabinowitz's golden result with ComplexPlot

CONTRIBUTED BY: Shenghui Yang | 5 years ago BY: EDITORIAL BOARD
Staff Picks , Algebra , Calculus , Computer-Based Maths , Education , ...
2
REPLIES
11.6K
VIEWS

Findroot error: not a list of numbers?

QUESTION FROM: pemma dorji | 5 years ago BY: pemma dorji
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
2
REPLIES
4.8K
VIEWS

[GiF] Newton fractal with compile function

CONTRIBUTED BY: Shenghui Yang | 5 years ago BY: EDITORIAL BOARD
Staff Picks , Algebra , Dynamic Interactivity , Events & Media , ...
2
REPLIES
9.5K
VIEWS

Does AbsArg work for generic expressions?

QUESTION FROM: Luis Claudio LA | 5 years ago BY: Luis Claudio LA
Algebra , Mathematics , Wolfram Language
2
REPLIES
2.9K
VIEWS

Error solving inequality: no methods in Solve?

QUESTION FROM: Jonathan Wooldridge | 5 years ago BY: Jonathan Wooldridge
Algebra , Equation Solving , Mathematics , Wolfram Language
2
REPLIES
3.9K
VIEWS

How can I turn a system of equations into a matrix?

QUESTION FROM: Karla Reyes Lomelí | 5 years ago BY: Hans Dolhaine
Algebra , Mathematics , Wolfram Language
2
REPLIES
3.7K
VIEWS

Optimal climate policy: behind the scenes solving ODEs model

CONTRIBUTED BY: Stephen DeCanio | 5 years ago BY: EDITORIAL BOARD
Staff Picks , Algebra , Calculus , Earth Science , Equation Solving , ...
2
REPLIES
8.1K
VIEWS

Integral of Cauchy / Lorentzian distribution in Wolfram|Alpha

QUESTION FROM: Bastian Andersen | 5 years ago BY: Bastian Andersen
Algebra , Calculus , Mathematics , Wolfram|Alpha
2
REPLIES
5.3K
VIEWS

Mathematica vs Alpha output in Laplace transformation?

QUESTION FROM: Ted Bartlett | 5 years ago BY: Ted Bartlett
Algebra , Mathematica , Mathematics , Wolfram|Alpha , Wolfram Language
2
REPLIES
5.7K
VIEWS

Complex vector plot of Exp[1/z] ?

QUESTION FROM: Marius S | 5 years ago BY: Marius S
Algebra , Graphics and Visualization , Mathematics , Wolfram Language
2
REPLIES
2.9K
VIEWS

Tennis racket (Dzhanibekov) effect: torque-free rotational motion

CONTRIBUTED BY: Christian Peterson | 5 years ago BY: EDITORIAL BOARD
Staff Picks , Algebra , Dynamic Interactivity , Geometry , ...
2
REPLIES
12.3K
VIEWS
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