Calculate 2-D correlation coefficient between two ndarrays.
npm install ndarray-corr2``bash`
npm install ndarray-corr2
`js
const ndarray = require("ndarray");
const getPixels = require("get-pixels");
const corr2 = require("ndarray-corr2");
// example 1
let ndarray1 = ndarray([1, 2, 3, 4, 5, 6]);
let ndarray2 = ndarray([1, 2, 3, 4, 5, 6]);
console.log(corr2(ndarray1, ndarray2));
// print "1"
// example 2
let ndarray1 = ndarray([1, 2, 3, 4, 5, 6], [2, 3]);
let ndarray2 = ndarray([6, 5, 4, 3, 2, 1], [2, 3]);
console.log(corr2(ndarray1, ndarray2));
// print "-1"
// example 3
let ndarray1 = ndarray([23, 16, 85, 58], [2, 2]);
let ndarray2 = ndarray([25, 56, 32, 41], [2, 2]);
console.log(corr2(ndarray1, ndarray2));
// print "-0.33985761679300736"
// example 4
getPixels("lena.png", function(err, pixels) {
if(!err && pixels) {
console.log(corr2(pixels, pixels));
// print "1" because the two images are similar
}
});
``