@bluemath/linalg/lib/lapack/gesdd.js

Bluemath Linear Algebra library

"use strict";
/*

Copyright (C) 2017 Jayesh Salvi, Blue Math Software Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

*/
Object.defineProperty(exports, "__esModule", { value: true });
var lapacklite = require("../../ext/lapacklite");
var em = lapacklite.Module;
var common_1 = require("./common");
/**
 * @hidden
 */
function gesdd_internal(mA, m, n, mU, mS, mVT, job, numtype) {
    var fn = (numtype === 'f32') ? common_1.sgesdd_wrap : common_1.dgesdd_wrap;
    var pjobz = common_1.defineEmVariable('i8', job.charCodeAt(0));
    var pm = common_1.defineEmVariable('i32', m);
    var pn = common_1.defineEmVariable('i32', n);
    var plda = common_1.defineEmVariable('i32', Math.max(m, 1));
    var pldu = common_1.defineEmVariable('i32', Math.max(m, 1));
    var pldvt = common_1.defineEmVariable('i32', n);
    var plwork = common_1.defineEmVariable('i32', -1);
    var _a = common_1.defineEmArrayVariable(numtype, m * n, mA), pA = _a[0], A = _a[1];
    var _b = common_1.defineEmArrayVariable(numtype, Math.min(m, n)), pS = _b[0], S = _b[1];
    var _c = common_1.defineEmArrayVariable(numtype, m * n), pU = _c[0], U = _c[1];
    var _d = common_1.defineEmArrayVariable(numtype, n * n), pVT = _d[0], VT = _d[1];
    var piwork = common_1.defineEmArrayVariable('i32', 8 * Math.min(m, n))[0];
    var pwork = common_1.defineEmArrayVariable(numtype, 1)[0];
    var pinfo = common_1.defineEmVariable('i32');
    // work size query
    fn(pjobz, pm, pn, pA, plda, pS, pU, pldu, pVT, pldvt, pwork, plwork, piwork, pinfo);
    var worksize = em.getValue(pwork, numtype === 'f32' ? 'float' : 'double');
    pwork = common_1.defineEmArrayVariable(numtype, worksize)[0];
    em.setValue(plwork, worksize, 'i32');
    fn(pjobz, pm, pn, pA, plda, pS, pU, pldu, pVT, pldvt, pwork, plwork, piwork, pinfo);
    var info = em.getValue(pinfo, 'i32');
    if (info < 0) {
        throw new Error('Invalid argument (' + (-info) + ')');
    }
    if (info > 0) {
        throw new Error('DBDSDC did not converge (' + info + ')');
    }
    mA.set(A);
    mS.set(S);
    if (job !== 'N') {
        mU.set(U);
        mVT.set(VT);
    }
}
/**
 * @hidden
 */
function gesdd(mA, m, n, mU, mS, mVT, job) {
    if (mA instanceof Float64Array ||
        mU instanceof Float64Array ||
        mVT instanceof Float64Array) {
        return gesdd_internal(mA, m, n, mU, mS, mVT, job, 'f64');
    }
    else {
        return gesdd_internal(mA, m, n, mU, mS, mVT, job, 'f32');
    }
}
exports.gesdd = gesdd;