63 questions linked to/from Why does MatrixForm affect calculations?
2k views

### Symbolic determinant is not computing [duplicate]

I'm trying to compute the determinant of a symbolic matrix made with the following code: ...
2k views

### Display problem multiplying matrix [duplicate]

I'm multiplying matrices and I don't get answer I want I just get matrix M times matrix N, there is no result. What to do and ...
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### Mathematica won't multiply a numeric matrix by a symbolic matrix [duplicate]

If I1 = {{1,0},{1,-1}} and Acl = {{A , -B*K},{C*L, A-B*K-C*L}} where A, B, C, and D are not defined in the notebook. ...
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### How to calculate $(X^tX)^{-1}X^tY$? [duplicate]

This is MatrixForm[ {{1., 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, {1, 1.5, 1.5, 1.5, 2, 2, 2.2, 2.4, 2.5, 2.5, 2.8, 2.8, 3, 3, 3.2, 3.3}}] $X^t$ ...
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### How can I force Mathematica to take the dot product here? [duplicate]

The code: vec1 = {{-1}, {0}, {1}} // MatrixForm vec2 = {{-1}, {1}, {0}} // MatrixForm p[v2_, v1_] := v1 (v1.v2)/Sqrt[(v1.v1) (v2.v2)]; u2 = vec2 - p[vec2, vec1] ...
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### Unexpected behavior from NumberForm of a matix [duplicate]

If I calculate the dimension of the matrix after NumberForm directly, then there will be something wrong ...
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### Matrix multiplication involving MatrixForm [duplicate]

Possible Duplicate: Why does MatrixForm affect calculations? I am doing a matrix multiplication, but not getting the desired output. I am doing the matrix multiplication of $A^{-1}B$ from the ...
261 views

### solving singular matrix [duplicate]

Hello I have a matrix that is singular, and i wanted to use linear solve to solve it but that doesn't work with mathematica. The matrix given as a list looks like this: ...
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### Suggest how to do this matrix multiplication [duplicate]

Have a look at the Mathematica calculation ...
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### Problem with List Dimension Outer Map [duplicate]

I am currently handling a big list which has the following dimension: {6, 3, 4, 2, 2, 1, 8} where the last number 8 represent a ...
129 views

### Why does Eigenvalues[matrix I defined] not work? [duplicate]

This is the code I have in my mathematica notebook. I want to find the eigenvalues of the matrix I created called Hmatrix as defined below. However when I type Eigenvalues[Hmatrix] I get the Hmatrix ...
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### 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 ...
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### The ArrayFlatten seems to have no effect for some reason [duplicate]

I am a new Mathematica user, I am attempting to use ArrayFlatten but it seems not to work in this case. My codes are below, ...
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### Unexpected behavior of ScientificForm when applied to a list [duplicate]

Consider a = Table[1, 100] la = Length[a] b = ScientificForm[a] lb = Length[b] la = 100 and ...
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### 'MatrixForm' problem [duplicate]

I prefer to use 'MatrixForm' because the form looks better in matrix manipulation. But my current problem is that after the use of 'MatrixForm', subsequent matrix calculations like 'Det' or 'Inverse' ...
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### Inverting a matrix [duplicate]

Possible Duplicate: Why does MatrixForm affect calculations? I am facing a strange behaviour from Mathematica when asking it to invert the following matrix: ...
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### 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? ...
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### Difference between matrix rapresentation [duplicate]

I've noticed different behaviour in Mathematica between matrix representation: The matrix a={{1,2},{3,4}} is different from b=a // MatrixForm Why i obtain ...
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### Why isn't the matrix product computed? [duplicate]

Possible Duplicate: Why does MatrixForm affect calculations? I have the following input: http://wstaw.org/m/2012/11/15/geogebra4.png Why is the matrix not computed, giving me a $2 \times 2$ ...
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### Why doesn't this evaluate further [duplicate]

The figure above shows the code as typed into Mathematica. In the fourth last line (or In as you prefer) the expression is not evaluated to the fullest extent possible. Why does this occur? I ...
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### 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 ...
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 ...
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### Adding two matrices together results in a weird result [duplicate]

I want to add two 10 by 10 matrices (same dimension) together but get a weird result. This is the screenshot of it: The matrices are defined in this manner: ...
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### Using functions as input for a function - won't simplify [duplicate]

I've defined a function P[k_] := 1/[Sqrt]2 (R[k] + L[k]) where R and L generate matrices. However the output of this function never full simplifies (even when I use the Simplify[%] functions). It ...
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### Matrices multiplification [duplicate]

I have to multiplty 2 matrices in Mathematica, but I have no idea how to force simplification. I create matrices by A={{a,1,b,},... and multiply using C=Dot=[A,B]//MatrixForm My problem is that ...
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### Why do I have to index my covariance matrix as if it has 3 dimensions [duplicate]

The language reference for getting parts of a matrix seems to make sense. I'm wondering why my covariance matrix behaves differently. ...
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### 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. ...
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### Problem subtracting matrices [duplicate]

I am trying to study eigenvalues and eigenvectors using Mathematica. I am trying to compute $A-\lambda I$, so I created a matrix A and a matrix with $\lambda$ in the diagonal: ...
18 views

### Matrix multiplication Q.W not working - Result=matrix Q . matrix W [duplicate]

When I write the code to do the dot product between two matrices, Mathematica does not compute it: How can I get the right matrix? EDIT Thank you for your willingness.
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### Rank of symbolic matrix [duplicate]

I can't figure out why Mathematica can't calculate rank of a symbolic matrix. Please take a look at the attached screenshot below. If you need the full source code then you can find it in the "...
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### Creating 3x3 Matrix using Table Function and then accessing an element [duplicate]

I use the table function to create a 3x3 matrix in index notation. I assume that I can access the element in first row and first column using A[[1,1]] but instead ...
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### 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]
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### Head of a MatrixForm expression?

An example in http://www-zeuthen.desy.de/theory/capp2005/Course/hahn/mathematica.pdf amounts to the following ...
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### How to make Mathematica show matrices and vectors nicely

It shows me like {{0}, {1}, {0}, {-1}} . Is it possible to make it look like a vector, always?
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### 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 ...
157 views

### Revert FullForm back to “normal”

I am trying to find the function that converts the result of FullForm back into a standard pretty looking output. Here is what I mean: ...