Hello nd4js / Fil | Observable

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Oct 16, 2020

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Linear Algebra

// https://bundle.run/nd4js

nd = require(await FileAttachment("nd4js-1.3.0").url())

viewof A = pt(nd.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]))

A.shape

viewof v = pt(nd.array([[1, 2, -3]]).T)

pt(nd.la.matmul(v.T, A, v))

viewof M = pt(nd.tabulate([1000, 100], (i, j) => Math.random() - 0.5))

SVD = {

const time = performance.now();

const SVD = nd.la.svd_decomp(M);

SVD.time = (performance.now() - time) | 0;

return SVD;

}

pt(SVD[0])

pt(SVD[1])

pt(SVD[2])

viewof E = pt(

nd.tabulate([100, 100], (i, j) =>

Math.min((i + 1) / (j + 1), (j + 1) / (i + 1))

)

Ev = {

const time = performance.now();

const Ev = nd.la.eigen(E);

Ev.time = (performance.now() - time) | 0;

return Ev;

}

pt(Ev[0])

pt(Ev[1])

import { pt } from "@fil/pt"

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