Extracting vector containing the elements of the main diagonal of a matrix
95387
Mathematical expression to form a vector from diagonal elements
71605
Chopping matrix elements, real or imaginary
97668
Determining an unknown vector from its cross and dot product with known vector
47450
Mathematica program for PLUR decomposition of a symbolic matrix using full pivoting
149981
Find the eigenvalues and eigenvectors with zeroes on the diagonal and ones everywhere else.
149292
Inverse of a diagonal matrix plus a constant
70397
Building matrices by attaching vectors (columns) and matrices
127025
Diagonalization of a projection
134244
Determinant of a matrix will all off-diagonal elements equal
52260
Diagonalization and eigenvalues
21758
Rank of the $n \times n$ matrix with ones on the main diagonal and $a$ off the main diagonal
10793
How to compute the determinant of a tridiagonal matrix with constant diagonals?
6603
"Indexing" a vector
72578
Determinant value of a square matrix whose each entry is the g.c.d. of row and column position
96231
Get all the diagonals in a matrix/list of lists in Python
81227
Matrix equation (esp. row vectors)
121769
How to find the matrix representation of a linear tranformation