forked from sheetjs/sheetjs
SheetJS
93f7749bec
- all formats accept `sheetRows` option (fixes #1062 h/t @prog666) - `table_to_*` support for `sheetRows` - demo cleanup
60 lines
1.9 KiB
JavaScript
60 lines
1.9 KiB
JavaScript
/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
|
|
/* eslint-env node */
|
|
var XLSX = require('xlsx');
|
|
var pr = require('propel');
|
|
var linest = require('./linest');
|
|
|
|
/* generate linreg.xlsx with 100 random points */
|
|
linest.generate_random_file(100);
|
|
|
|
/* get the first worksheet as an array of arrays, skip the first row */
|
|
var wb = XLSX.readFile('linreg.xlsx');
|
|
var ws = wb.Sheets[wb.SheetNames[0]];
|
|
var aoa = XLSX.utils.sheet_to_json(ws, {header:1, raw:true}).slice(1);
|
|
|
|
/* calculate the coefficients in JS */
|
|
(function(aoa) {
|
|
var x_ = 0, y_ = 0, xx = 0, xy = 0, n = aoa.length;
|
|
for(var i = 0; i < n; ++i) {
|
|
x_ += aoa[i][0] / n;
|
|
y_ += aoa[i][1] / n;
|
|
xx += aoa[i][0] * aoa[i][0];
|
|
xy += aoa[i][0] * aoa[i][1];
|
|
}
|
|
var m = Math.fround((xy - n * x_ * y_)/(xx - n * x_ * x_));
|
|
console.log(m, Math.fround(y_ - m * x_), "JS Post");
|
|
})(aoa);
|
|
|
|
/* build X and Y vectors */
|
|
var tensor = pr.tensor(aoa).transpose();
|
|
var xs = tensor.slice(0, 1);
|
|
var ys = tensor.slice(1, 1);
|
|
|
|
/* compute the coefficient */
|
|
var n = xs.size;
|
|
var x_ = Math.fround(xs.reduceMean().dataSync()[0]);
|
|
var y_ = Math.fround(ys.reduceMean().dataSync()[0]);
|
|
var xx = Math.fround(xs.dot(xs.transpose()).dataSync()[0]);
|
|
var xy = Math.fround(xs.dot(ys.transpose()).dataSync()[0]);
|
|
var m = Math.fround((xy - n * x_ * y_)/(xx - n * x_ * x_));
|
|
var b_ = Math.fround(y_ - m * x_);
|
|
console.log(m, b_, "Propel");
|
|
var yh = xs.mul(m).add(b_);
|
|
|
|
/* export data to aoa */
|
|
var prdata = pr.concat([xs, ys, yh]).transpose();
|
|
var shape = prdata.shape;
|
|
var prarr = prdata.dataSync();
|
|
var praoa = [];
|
|
for(var j = 0; j < shape[0]; ++j) {
|
|
praoa[j] = [];
|
|
for(var i = 0; i < shape[1]; ++i) praoa[j][i] = prarr[j * shape[1] + i];
|
|
}
|
|
|
|
/* add headers and export */
|
|
praoa.unshift(["x", "y", "pred"]);
|
|
var new_ws = XLSX.utils.aoa_to_sheet(praoa);
|
|
var new_wb = XLSX.utils.book_new();
|
|
XLSX.utils.book_append_sheet(new_wb, new_ws, "Sheet1");
|
|
XLSX.writeFile(new_wb, "propel.xls");
|