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var mat1 = math.ones(1000, 2);
var mat2 = math.ones(2, 1000);
var mat3 = math.ones(1000, 2);
var mat4 = math.ones(2,10000);
var mat5 = math.ones(10000,10000);
var matOut;
var i;

console.time('someFunction');
for (i = 0; i < 4;++i){
    var h1 = math.multiply(mat1,mat2); 
    var h2 = math.multiply(mat3,mat4); 
    var h3 = math.multiply(h1,h2);
    matOut = math.multiply(h3,mat5); 
}

console.timeEnd('someFunction');