Difference between revisions of "Remncomm.m"
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{{DISPLAYTITLE:remncomm.m}} __NOTOC__ | {{DISPLAYTITLE:remncomm.m}} __NOTOC__ | ||
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Removes from the Hermitian operator A the part that does not commute with the Hermitian operator B. | Removes from the Hermitian operator A the part that does not commute with the Hermitian operator B. | ||
==Syntax== | ==Syntax== | ||
| − | + | A=remncomm(A,EvB) | |
==Arguments== | ==Arguments== | ||
| − | + | A - a square matrix | |
EvB - a square matrix containing eigenvectors | EvB - a square matrix containing eigenvectors | ||
| Line 15: | Line 16: | ||
==Outputs== | ==Outputs== | ||
| − | + | C - a square matrix | |
==Notes== | ==Notes== | ||
| + | |||
When the matrix B is diagonal, the part of A that commutes with it is the diagonal part, so just use diag(diag(A)). | When the matrix B is diagonal, the part of A that commutes with it is the diagonal part, so just use diag(diag(A)). | ||
==See also== | ==See also== | ||
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[[Kernel_utilities#Numerical_infrastructure|Numerical infrastructure]] | [[Kernel_utilities#Numerical_infrastructure|Numerical infrastructure]] | ||
''Version 2.5, authors: [[Ilya Kuprov]]'' | ''Version 2.5, authors: [[Ilya Kuprov]]'' | ||
Revision as of 15:04, 5 April 2026
Removes from the Hermitian operator A the part that does not commute with the Hermitian operator B.
Syntax
A=remncomm(A,EvB)
Arguments
A - a square matrix
EvB - a square matrix containing eigenvectors
of B in columns
Outputs
C - a square matrix
Notes
When the matrix B is diagonal, the part of A that commutes with it is the diagonal part, so just use diag(diag(A)).
See also
Version 2.5, authors: Ilya Kuprov
