Linked Questions

13
votes
4answers
1k views

How to solve this matrix equation

How to solve this matrix equation Solve[MatrixRank[( { {1, x, 3}, {2, 4, 5}, {2, 4, x} } )] == 2, x, Reals]
4
votes
3answers
432 views

Generating all 2x2 matrices with entries from 0 to 3 whose det is 1 with mod 2 arithmetic

I am trying to make a list of 2x2 matrices whose entries are all possible permutations of 0,1,2 and det=1 mod 2 arithmetic. First I tried to create a Table like this ...
0
votes
0answers
51 views

How do i transform a Matrix into a List? [duplicate]

Like the title says i want to transform a Matrix into a list so i can use LinearSolve what's the way to do it? ...
0
votes
0answers
20 views

Using Eigensystem to solve eigenvalue problem [duplicate]

I'm trying to solve an eigenvalue problem of the form: $\textbf{A}\vec{x}=\lambda \textbf{B}\vec{x}$, where A and B are square matrices, $\lambda$ are the eigenvalues and $\vec{x}$ the eigenfunctions. ...
0
votes
1answer
32 views

Subtraction of vectors subtracts whole vector with individual elements

When I'm trying to calculate the value of DP, it subtracts the PCurrent matrix from each element of PGoal. What am I doing wrong? ...
0
votes
0answers
39 views

Mathematica wrongly displays rows instead of columns [duplicate]

I want to perform some operations with certain column but when I tried to display the first column as it is shown in attached picture 1 (in some reference on web) of the table but Mathematica ...
0
votes
0answers
37 views

Matrix Vector multiplication [duplicate]

I have a rather simple question which surprisingly i could find the answer theres a matrix $U $ whith is $4*4$ and a vector $A$ which is $4*1$ and when I wand to multiply them by $U.A$ operator i get ...
0
votes
0answers
41 views

Why doesn't this evaluate further [duplicate]

The figure above shows the code as typed into Mathematica. In the fourth last line (or In[15] as you prefer) the expression is not evaluated to the fullest extent possible. Why does this occur? I ...
0
votes
3answers
78 views

Detecting errors and providing alternative results [closed]

I have the following piece of code: ...
0
votes
2answers
123 views

Looping through the internal form of a symbolic expression? [closed]

Could someone provide code for looping through the internal form for a symbolic expression? Specifically I am looking to write my own code for simplifying expressions (such as removing a common ...
1
vote
1answer
105 views

How to interchange columns of a matrix? [duplicate]

Suppose I have a matrix M={{1,2,3},{4,5,6},{7,8,9}}//MatrixForm What code do I write to interchange columns and make it into ...
2
votes
4answers
247 views

Dot product result has wrong dimension [closed]

I'm doing a small project and I've encountered a problem while using Mathematica. I should mention that I'm kinda new to this software, so maybe it's just something I haven't grasped yet. Anyway, I ...
0
votes
1answer
40 views

constructing Matrix from coefficients of solution & assigning 0 for empty Cells [closed]

i tried to construct a matrix from the coefficients of my solution, but problem that; 1; how can i get coefficients out of Solve 2; some Matrix elements are empty so i must assign 0 in those empty ...
0
votes
2answers
134 views

Constructing a special square matrix

I am trying to define an $n \times n$ matrix for even $n$ using ...
0
votes
1answer
51 views

Approximate results

I am trying to show that two matrices are the same. One matrix has random elements drawn from a distribution of ${(-0.75,-0.25,0,0.25,0.75,0.95)}$, while the other has values with imaginary parts ...

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