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Results tagged with matrix
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user 62817
Questions on the manipulation of matrices in Mathematica.
3
votes
1
answer
53
views
How can I create a large matrix without running into hangs or recursion errors?
I'm trying to create a probability matrix, starting by creating a 100,000 by 100,000 identity matrix. …
- 257
2
votes
1
answer
1k
views
How can I tell if a matrix is ill-conditioned or Singular by using the Eigensystem function(...
How high or low does the condition number have to be for us to deem the corresponding matrix ill-conditioned? … On one matrix, the condition number is $\infty$, I'm sure this is ill-conditioned, but the other numbers are something like 14.555555, and 120.4, etc. …
- 257
1
vote
1
answer
63
views
Why do I keep getting the same time from the Timing function?
The matrix for n=100000 ran for probably 20 mins and still returned 0.015625. … My process to create the matrix is basically:
A = IdentityMatrix[100000, SparseArray];
For[i = 2, i < 100000, i++,
A[[i, i]] = -1;
A[[i, i - 1]] = .5;
A[[i, i + 1]] = .5
];
The vector is created …
- 257