venny/bin/fmin/blas1.js

Declarative Venn diagrams

// Code adapted from https://github.com/benfred/fmin
// need some basic operations on vectors, rather than adding a dependency,
// just define here
export function zeros(x) {
    const r = new Array(x);
    for (let i = 0; i < x; ++i) {
        r[i] = 0;
    }
    return r;
}
export function zerosM(x, y) {
    return zeros(x).map(function () { return zeros(y); });
}
export function dot(a, b) {
    let ret = 0;
    for (let i = 0; i < a.length; ++i) {
        ret += a[i] * b[i];
    }
    return ret;
}
export function norm2(a) {
    return Math.sqrt(dot(a, a));
}
export function scale(ret, value, c) {
    for (let i = 0; i < value.length; ++i) {
        ret[i] = value[i] * c;
    }
}
export function weightedSum(ret, w1, v1, w2, v2) {
    for (let j = 0; j < ret.length; ++j) {
        ret[j] = w1 * v1[j] + w2 * v2[j];
    }
}