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Unexpected matrix multiplication results?

QUESTION FROM: Gugan S | 5 years ago BY: Neil Singer
Algebra , Mathematics , Wolfram Language
6
REPLIES
4.9K
VIEWS

Error solving system of differential equations

QUESTION FROM: Maksim Ritutnev | 5 years ago BY: Neil Singer
Algebra , Calculus , Equation Solving , Mathematica , Mathematics , ...
1
REPLIES
4.1K
VIEWS

Why does the output have Nulls? (was: Help me, please!)

QUESTION FROM: Maria Luisa | 5 years ago BY: Eric Rimbey
Algebra , Equation Solving , Mathematica , Wolfram Language
4
REPLIES
10.8K
VIEWS

Commutation of several matrices using Do?

QUESTION FROM: Nomsa Ledwaba | 5 years ago BY: Nomsa Ledwaba
Algebra , Mathematics , Wolfram Language
3
REPLIES
4.5K
VIEWS

Changing the RHS of an equation in order to inset a line?

QUESTION FROM: Christopher Young | 5 years ago BY: Christopher Young
Algebra , Equation Solving , Graphics and Visualization , ...
3
REPLIES
5.2K
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

Error Derivative::novar in PDEs?

QUESTION FROM: Saleh Baradaran | 5 years ago BY: Saleh Baradaran
Algebra , Calculus , Equation Solving , Mathematics , Wolfram Language
11
REPLIES
4.7K
VIEWS

NDSolve error: step size is effectively zero

QUESTION FROM: Lance Randall Gamier | 5 years ago BY: Lance Randall Gamier
Algebra , Equation Solving , Graphics and Visualization , ...
6
REPLIES
8.5K
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

Automatically calculate equation's discriminant and Veda？

QUESTION FROM: Lee Tao | 5 years ago BY: Lee Tao
Algebra , Mathematics , Wolfram Language
20
REPLIES
7.7K
VIEWS

Arg of roots of a complex number?

QUESTION FROM: Andrew Read | 5 years ago BY: Shenghui Yang
Algebra , Equation Solving , Mathematica , Mathematics , ...
3
REPLIES
5.5K
VIEWS

Error using Solve[ ] for an equation?

QUESTION FROM: mahdi safarbali | 5 years ago BY: mahdi safarbali
Algebra , Equation Solving , Mathematics , Symbolic Computations , ...
5
REPLIES
3.9K
VIEWS

Numerical value of QPolyGamma[ ]?

QUESTION FROM: Leon Fairbanks | 5 years ago
Algebra , Numerical Computation , Wolfram Language
0
REPLIES
3.2K
VIEWS

Modified Bessel differential equation?

QUESTION FROM: Xin Ning | 5 years ago BY: Xin Ning
Algebra , Calculus , Equation Solving , Mathematics , Wolfram Language
4
REPLIES
4.5K
VIEWS

Some ideas for a next gen Wolfram Language

QUESTION FROM: flyredeagle flyredeagle | 5 years ago BY: Brad Klee
Algebra , Equation Solving , Mathematica , Numerical Computation , ...
1
REPLIES
7.3K
VIEWS

Solving three equations

QUESTION FROM: S Sarkar | 5 years ago BY: Hans Dolhaine
Algebra , Equation Solving , Mathematics , Wolfram Language
6
REPLIES
7.1K
VIEWS

How to copy from a FullSimplify popup?

QUESTION FROM: Leon Fairbanks | 5 years ago BY: Leon Fairbanks
Algebra , Mathematics , User Interface , Wolfram Language
3
REPLIES
6.1K
VIEWS

Evaluation Control of a recursive function inside Piecewise

QUESTION FROM: Andre Luiz Rocha Alves | 5 years ago BY: Andre Luiz Rocha Alves
Algebra , Graphics and Visualization , Mathematics , Wolfram Language
4
REPLIES
4.3K
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

Define and solve formula syntax problem

QUESTION FROM: Karl S | 5 years ago BY: Rohit Namjoshi
Algebra , Equation Solving , Numerical Computation , Physics , ...
7
REPLIES
4.2K
VIEWS

Use a Wolfram Language equivalent to Matlab's "linspace" function?

QUESTION FROM: Ehud Behar | 5 years ago BY: Ehud Behar
Algebra , Mathematics , Wolfram Language
4
REPLIES
31.2K
VIEWS

Limits of Mathematica's numeric precision?

QUESTION FROM: Leon Fairbanks | 5 years ago BY: Gianluca Gorni
Algebra , Mathematica , Mathematics , Numerical Computation , ...
5
REPLIES
7.7K
VIEWS

Fixed points of coupled NLD involving transcendental functions

QUESTION FROM: vijay arjun | 5 years ago BY: Daniel Lichtblau
Algebra , Equation Solving , Mathematics , Symbolic Computations , ...
12
REPLIES
6.5K
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

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

Plot functions and their guide function images into same coordinate system

QUESTION FROM: Lee Tao | 5 years ago BY: Lee Tao
Algebra , Graphics and Visualization , Mathematics , Wolfram Language
7
REPLIES
4.1K
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

Like cells with different output. Why the difference?

QUESTION FROM: Jay Gourley | 5 years ago BY: Jay Gourley
Algebra , Mathematics , Wolfram Language
1
REPLIES
4.3K
VIEWS

Plotting a function which has eingenvalues of a matrix?

QUESTION FROM: Matheus Soares | 5 years ago BY: Hans Dolhaine
Algebra , Calculus , Equation Solving , Graphics and Visualization , ...
1
REPLIES
3.2K
VIEWS

Dilogarithm functional equations: FullSimplify & FunctionExpand

QUESTION FROM: Andrew S | 5 years ago
Algebra , Mathematics , Wolfram Language
0
REPLIES
2.7K
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

Inconsistent results for the the root of an equation?

QUESTION FROM: Mishal Mohanlal | 5 years ago BY: Gianluca Gorni
Algebra , Equation Solving , Mathematics , Symbolic Computations , ...
3
REPLIES
4.7K
VIEWS

How to put a variable angle?

QUESTION FROM: BMAS Jinaruwan | 5 years ago BY: BMAS Jinaruwan
Algebra , Equation Solving , Wolfram Language
4
REPLIES
3.4K
VIEWS

No output from Plot3D[ ]?

QUESTION FROM: Ryo Tanaka | 5 years ago BY: Bill Nelson
Algebra , Graphics and Visualization , Wolfram Language
1
REPLIES
3.3K
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

Create the large size of SparseArray

QUESTION FROM: ddtty kuso | 5 years ago BY: Bill Nelson
Algebra , Mathematics , Tuning and Debugging , Wolfram Language
3
REPLIES
4.6K
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

Speed up FindRoot for system of equations

QUESTION FROM: Rainald Borck | 5 years ago
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
0
REPLIES
2.5K
VIEWS

Real, complex, and infinite results from Integrate[] for like inputs

QUESTION FROM: John Mappes | 5 years ago
Algebra , Calculus , Mathematics , Wolfram Language
0
REPLIES
2.7K
VIEWS

Solve[ ] gives an empty output?

QUESTION FROM: Umut Cemre Can | 5 years ago BY: Umut Cemre Can
Algebra , Equation Solving , Mathematics , Symbolic Computations , ...
6
REPLIES
5.5K
VIEWS

Error solving polynomial equation using Solve[ ]?

QUESTION FROM: Kyaw Hla Chak | 5 years ago BY: Gianluca Gorni
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
3
REPLIES
4.7K
VIEWS

Make an array from a convolution of two functions

QUESTION FROM: Alexander Nikitin | 5 years ago BY: Rohit Namjoshi
Algebra , Graphics and Visualization , Mathematics , Wolfram Language
3
REPLIES
3.4K
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

User-defined assignment is ignored in large Table[ ] computation

QUESTION FROM: Martin Guttmann | 5 years ago BY: Rohit Namjoshi
Algebra , Mathematica , Mathematics , Wolfram Language
3
REPLIES
4K
VIEWS

Error "unable to solve" using NSolve on circle-equation

QUESTION FROM: Rolf Kopsch | 5 years ago BY: Jon McLoone
Algebra , Equation Solving , Mathematica , Mathematics , ...
3
REPLIES
8K
VIEWS

Error using NDEigensystem output as initial condition of NDSolve

QUESTION FROM: conan alexander | 5 years ago
Algebra , Calculus , Equation Solving , Graphics and Visualization , ...
0
REPLIES
2.4K
VIEWS

Adjugate call from Wolframscript?

QUESTION FROM: Vinicio González Urbina | 5 years ago BY: Rohit Namjoshi
Algebra , Mathematics , Wolfram Language
1
REPLIES
3K
VIEWS

Solving non-linear equations: no methods available error

QUESTION FROM: Gerd-Rüdiger Jaenisch | 5 years ago BY: Mariusz Iwaniuk
Algebra , Equation Solving , Mathematics , Symbolic Computations , ...
1
REPLIES
4.2K
VIEWS

No solution from RSolve[ ] of two equations?

QUESTION FROM: kakawa nobuhiko | 5 years ago BY: Hans Dolhaine
Algebra , Equation Solving , Mathematics , Wolfram Language
4
REPLIES
5.9K
VIEWS

How can I Rationalize this?

QUESTION FROM: Jairo Smith Quilumbaquin Lanchimba | 5 years ago BY: Jairo Smith Quilumbaquin Lanchimba
Algebra , Equation Solving , Mathematics , Symbolic Computations , ...
7
REPLIES
6.7K
VIEWS

Export FindRoot[ ] output to xls file?

QUESTION FROM: Chenghua Deng | 5 years ago BY: Hans Milton
Algebra , Equation Solving , Import and Export , Mathematics , ...
7
REPLIES
5.7K
VIEWS

NSolve works with not a valid variable or gives no solution

QUESTION FROM: Luis Felipe Massena Misiec | 5 years ago BY: Luis Felipe Massena Misiec
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
13
REPLIES
5.8K
VIEWS

NDSolve for a system of second order differential equations

QUESTION FROM: Lorenzo Mereu | 5 years ago BY: Lorenzo Mereu
Algebra , Calculus , Equation Solving , Mathematics , ...
5
REPLIES
4.6K
VIEWS

How to write a matrix in a different basis?

QUESTION FROM: Matheus Soares | 5 years ago BY: Rohit Namjoshi
Algebra , Mathematics , Wolfram Language
5
REPLIES
4.4K
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

Solving system of implicit functions: solution satisfies one equation

QUESTION FROM: Guangye Cao | 5 years ago BY: Rohit Namjoshi
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
6
REPLIES
4.2K
VIEWS

Math one-liners from YouTube

QUESTION FROM: Raspi Rascal | 5 years ago BY: Marvin Ray Burns A.G.S. (cum laude)
Algebra , Equation Solving , Events & Media , Mathematics , ...
8
REPLIES
15.3K
VIEWS

How can I match the result of an equation with a previous known result

QUESTION FROM: Luis Felipe Massena Misiec | 5 years ago BY: Rohit Namjoshi
Algebra , Mathematics , Wolfram Language
3
REPLIES
3.8K
VIEWS

Solving for two variables in Manipulate[ ]

QUESTION FROM: Ma noj | 5 years ago BY: Ma noj
Algebra , Dynamic Interactivity , Equation Solving , Mathematics , ...
3
REPLIES
4.6K
VIEWS

Error solving an equation: no methods available

QUESTION FROM: Mohamed Ezzat | 5 years ago BY: Gianluca Gorni
Algebra , Equation Solving , Mathematics , Wolfram Language
1
REPLIES
2.9K
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

Type bounds of integration for absolute value of complex number in W|A

QUESTION FROM: Ness Lange | 5 years ago BY: Mariusz Iwaniuk
Algebra , Mathematics , Wolfram|Alpha
3
REPLIES
4.7K
VIEWS

How to use/ evaluate symbolic vector calculus identities?

QUESTION FROM: Alberto Silva Ariano | 5 years ago BY: Gianluca Gorni
Algebra , Calculus , Mathematics , Wolfram Language
3
REPLIES
6.9K
VIEWS

Wolfram MathWorld notebook dynamic plot not working?

QUESTION FROM: R S | 5 years ago BY: Shenghui Yang
Algebra , Dynamic Interactivity , Graphics and Visualization , ...
1
REPLIES
5.1K
VIEWS

FindRoot yielding unexpected values?

QUESTION FROM: Alex L | 5 years ago BY: Alex L
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
2
REPLIES
5.1K
VIEWS

HankelH1 real part for large values of n differs from Python result

QUESTION FROM: D D | 5 years ago BY: D D
Algebra , Astronomy , Computer Science , Data Science , Economics , ...
9
REPLIES
7.9K
VIEWS

Using CoefficientArrays to Invert simultaneous equations

QUESTION FROM: Aslam Kittur | 5 years ago BY: Aslam Kittur
Algebra , Mathematics , Wolfram Language
2
REPLIES
5.8K
VIEWS

Matrix computation over modulo N

QUESTION FROM: Gaspard Pairault | 5 years ago BY: Daniel Lichtblau
Algebra , Mathematics , Wolfram Language
1
REPLIES
3.4K
VIEWS

Slider value change on output

QUESTION FROM: Ma noj | 5 years ago BY: Gianluca Gorni
Algebra , Dynamic Interactivity , Equation Solving , ...
1
REPLIES
5.3K
VIEWS

Numerically solving non-linear algebraic equations

QUESTION FROM: Vedat Erturk | 5 years ago BY: Vedat Erturk
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
6
REPLIES
6.5K
VIEWS

Formatting a question of solving equation in Wolfram|Alpha?

QUESTION FROM: Devansh Kamra | 5 years ago BY: Rohit Namjoshi
Algebra , Equation Solving , Mathematics , Wolfram|Alpha
1
REPLIES
4.3K
VIEWS

Importing a matrix from a txt file?

QUESTION FROM: Jaime de la Mota | 5 years ago BY: Jaime de la Mota
Algebra , Import and Export , Mathematics , Wolfram Language
2
REPLIES
6.9K
VIEWS

Curious about the behaviour of KarhunenLoeveDecomposition

QUESTION FROM: Jaime de la Mota | 5 years ago
Algebra , Mathematics , Statistics and Probability , Wolfram Language
0
REPLIES
4.2K
VIEWS

Solve does not produce a result for a system of equations.

QUESTION FROM: Edward Davis | 5 years ago BY: Edward Davis
Algebra , Equation Solving , Mathematics , Wolfram Language
2
REPLIES
5.1K
VIEWS

Confused about For loop and matrix dimensions

QUESTION FROM: Jaime de la Mota | 5 years ago BY: EDITORIAL BOARD
Algebra , Mathematics , Wolfram Language
1
REPLIES
4.7K
VIEWS

Chessboard distance between matrices

QUESTION FROM: Maria Mannone | 5 years ago BY: Maria Mannone
Algebra , Mathematics , Wolfram Language
2
REPLIES
3.6K
VIEWS

Passing NIntegrate through NSolve?

QUESTION FROM: Alex L | 5 years ago
Algebra , Calculus , Equation Solving , Mathematics , ...
0
REPLIES
2.5K
VIEWS

QRDecomposiiton difference between 12.0 and 12.3

QUESTION FROM: Haolin Li | 5 years ago BY: Daniel Lichtblau
Algebra , Mathematics , Wolfram Language
3
REPLIES
4.9K
VIEWS

Sum of two equal expressions

QUESTION FROM: martina cottini | 5 years ago BY: Marvin Ray Burns A.G.S. (cum laude)
Algebra , Mathematics , Wolfram Language
1
REPLIES
7.5K
VIEWS

Plotting “Findroot” solution with very complex variables?

QUESTION FROM: qiaoke zhang | 5 years ago BY: Rohit Namjoshi
Algebra , Equation Solving , Numerical Computation , Wolfram Language
1
REPLIES
3.6K
VIEWS

Grandfathers/fathers first-order/predicate logic with FindEquationalProof

QUESTION FROM: uwe moehring | 5 years ago
Algebra , Mathematics , Wolfram Language
0
REPLIES
3.7K
VIEWS

FindRoot: why must the number of equations match the number of variables?

QUESTION FROM: Norbert Fabritius | 5 years ago BY: Norbert Fabritius
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
2
REPLIES
5.6K
VIEWS

Solving from previous results

QUESTION FROM: Ma noj | 5 years ago BY: Ma noj
Algebra , Equation Solving , Mathematics , Wolfram Language
8
REPLIES
5K
VIEWS

Runge Kutta method for a system

QUESTION FROM: Vedat Erturk | 5 years ago BY: Hans Dolhaine
Algebra , Equation Solving , Mathematics , Wolfram Language
28
REPLIES
7.9K
VIEWS

Solving system of equations works on V7 but not V12?

QUESTION FROM: James Shaw | 5 years ago BY: Gianluca Gorni
Algebra , Equation Solving , Mathematics , Wolfram Language
3
REPLIES
4K
VIEWS

How to include the origin of a dot plot ?

QUESTION FROM: Pierre-Loïc Boudry | 5 years ago BY: Pierre-Loïc Boudry
Algebra , Calculus , Graphics and Visualization , ...
2
REPLIES
5.5K
VIEWS

Unfold a tensor into a matrix to do inversion/pseudoinversion?

QUESTION FROM: Alberto Silva Ariano | 5 years ago BY: Hans Dolhaine
Algebra , Mathematics , Wolfram Language
6
REPLIES
10.4K
VIEWS

Implementing Lanczos algorithm in Mathematica

QUESTION FROM: Feras Moh | 5 years ago BY: Feras Moh
Algebra , Mathematica , Mathematics , Wolfram Language
4
REPLIES
8.5K
VIEWS

Elimination of variables with Groebner basis

QUESTION FROM: Tiku Sharma | 5 years ago BY: Tiku Sharma
Algebra , Equation Solving , Optimization , Mathematics , ...
1
REPLIES
4.3K
VIEWS

Solving symbolically a system of 3 (complicated) equations

QUESTION FROM: Olimpia Cutinelli Rendina | 5 years ago BY: Gianluca Gorni
Algebra , Equation Solving , Mathematics , Symbolic Computations , ...
12
REPLIES
6.5K
VIEWS

Solving equation in terms of certain variable.

QUESTION FROM: Kyaw Hla Chak | 5 years ago
Algebra , Equation Solving , Mathematics , Wolfram Language
0
REPLIES
2.7K
VIEWS

Solve complex eigenvalue problem?

QUESTION FROM: Alex F | 5 years ago BY: Michael Helmle
Algebra , Equation Solving , Mathematics , Wolfram Language
2
REPLIES
7.9K
VIEWS

Force Solve[ ] to obtain real expressions?

QUESTION FROM: Leslaw Bieniasz | 5 years ago BY: Hans Milton
Algebra , Equation Solving , Mathematics , Symbolic Computations , ...
14
REPLIES
6.8K
VIEWS

Solving nonlinear equations self consistently

QUESTION FROM: Tiku Sharma | 5 years ago BY: Tiku Sharma
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
3
REPLIES
4.9K
VIEWS

Value of a variable by eliminating others in system of equations?

QUESTION FROM: JEEVANPREET KAUR | 5 years ago BY: JEEVANPREET KAUR
Algebra , Equation Solving , Mathematics , Wolfram Language
2
REPLIES
3.3K
VIEWS

Calculating determinants for various values of n?

QUESTION FROM: Ser Man | 5 years ago BY: Hans Dolhaine
Algebra , Mathematics , Wolfram Language
12
REPLIES
6.1K
VIEWS

Constructed matrix gives a ragged array

QUESTION FROM: Ser Man | 5 years ago BY: Hans Dolhaine
Algebra , Mathematics , Wolfram Language
1
REPLIES
3.5K
VIEWS

Using BSplineCurve in the web public version?

QUESTION FROM: Michael Vigdorowitsch | 5 years ago
Algebra , Wolfram|Alpha
0
REPLIES
2.6K
VIEWS

Numerically calculating the largest root of a function

QUESTION FROM: Alex B | 5 years ago BY: Alex B
Algebra , Equation Solving , Mathematics , Numerical Computation , ...
3
REPLIES
6.7K
VIEWS

Custom multiplication operation between variables

QUESTION FROM: David L | 5 years ago BY: Updating Name
Algebra , Discrete Mathematics , Mathematics , Wolfram Language
4
REPLIES
5.8K
VIEWS
4
5
6
7
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