https://github.com/cshaa/tensors.js

Proof-of-concept tensors for math.js
https://github.com/cshaa/tensors.js

Last synced: about 2 months ago
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Proof-of-concept tensors for math.js

• Host: GitHub
• URL: https://github.com/cshaa/tensors.js
• Owner: cshaa
• License: apache-2.0
• Created: 2020-03-01T00:00:35.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2021-05-12T00:31:25.000Z (over 3 years ago)
• Last Synced: 2024-10-14T19:38:29.677Z (3 months ago)
• Language: TypeScript
• Size: 11.7 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# tensors.js

Proof-of-concept tensors for math.js

## Intended usage

```typescript

import { vectorSpace, Reals, add, mul } from 'tensorjs';

import { matrix, diag } from 'mathjs';

const V = vectorSpace(Reals, 4);

const δ = V.identity;

δ.i.i // error

δ.I.i // 4

V.setIndexBasis('a..f', V.canon);

δ.A.b // diag([1,1,1,1])

const T = V.tensor(2,0);

mul(T.I.J, δ.K.j) // T.I.K

T.A.B = matrix([

    [1, 2, 3, 4],

    [0, 1, 0, 0],

    [5, 6, 7, 8],

    [0, 0, 0,-1]

]);

const g = V.tensor(0,2);

g.a.b = diag([-1,1,1,1]);

V.metric = g;

T.A.a // 6

T.I.i // 6

```