josdejong/mathjs
Better documentation of usolve limitations, or possibly error message when input is not upper triangular?
Offen
#2.333 geöffnet am 06.10.2021
documentationfeaturehelp wanted
Repository-Metriken
- Stars
- (15.065 Sterne)
- PR-Merge-Metriken
- (PR-Metriken ausstehend)
Beschreibung
Minimal code:
window.onload = function() {
const U = math.matrix([[0.10452846326765346,-120],[-0.9945218953682733,-0]])
const b = math.matrix([-22.163070207475485, -59.419761706007094])
result = math.usolve(U,b)
console.log(result)
}
The error I get: Uncaught Error: Linear system cannot be solved since matrix is singular.
I entered the very same equation into GNU Octave which was able to solve it: it is no unsolvable system. When switching the lines, it even becomes an upper triangular matrix with nonzero values on the diagonal line. So its determinant is not zero, which implicates that the matrix is not even singular!