64 questions linked to/from Why does MatrixForm affect calculations?
42 views

why does mathematica not return the result of the multiplication of a symbolic matrix and a symbolic vector? [duplicate]

I am really stuck at a simple problem. Maybe, it is not totally a problem. However, I don't understand why. I am trying to take the dot product of two expressions. Here is the code: ...
71 views

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: ...
68 views

'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' ...
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? ...
49 views

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 ...
41 views

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[15] 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 ...
32 views

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 ...
25 views

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 ...
20 views

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. ...
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. ...
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: ...