I'm learning Javascript, when I want to calculate using a formula the resulting data is NaN.
I want the resulting data to be
ar = [37, 36.63, 35.68, 38.81, 37.67, 37.64, 37.64, 39.74, 40.67, 40.61];
ma = [0.00, 0.63, 3.32, 0.81, 0.33, 0.36, 2.36, 1.26, 0.33, 1.61];
Is there something wrong with my code that is making me get this answer?
var suhu = [37, 36, 39, 38, 38, 38, 40, 41, 41, 39];
var ar = []
var ma = []
var temp = 0
// AR
for (var i = 1; i < suhu.length; i++) {
ar[0] = suhu[0]
temp = 0.99 * suhu[i - 1] + 0.06 * ma[i - 1]
ar.push(temp)
}
// MA
for (var j = 0; j < suhu.length; j++) {
suhu[j] = Math.abs(suhu[j] - ar[j]);
ma.push(suhu[j])
}
console.log(ar);
// 37, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN
console.log(ma);
// 0, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaNSo what should I do about it?
Calculating the values in ar and ma seems so dependent on each other. To calculate ar[i] you need ma[i-1] and for ma[i] you need ar[i]. This should be a single loop. You can't first compute one array and then the other.
var suhu = [37, 36, 39, 38, 38, 38, 40, 41, 41, 39];
var ar = [suhu[0]];
var ma = [0];
for (let i = 1; i < suhu.length; ++i) {
ar[i] = 0.99 * suhu[i - 1] + 0.06 * ma[i - 1];
ma[i] = Math.abs(suhu[i] - ar[i]);
}
console.log(ar);
console.log(ma);.as-console-wrapper{top:0;max-height:100%!important}The problem is that the calculation of ar[i] depends on ma[i-1] and ma[i] depends on ar[i] so you need to calculate these in the right order in a single loop.
const suhu = [37, 36, 39, 38, 38, 38, 40, 41, 41, 39];
const ar = [];
const ma = [];
// Calucate AR and MA together
ar[0] = suhu[0]
for (var i = 0; i < suhu.length; i++) {
if (i > 0)
ar.push(0.99 * suhu[i - 1] + 0.06 * ma[i - 1])
ma.push(Math.abs(suhu[i] - ar[i]));
}
console.log(ar);
// [37, 36.63, 35.6778, 38.809332, 37.66855992, 37.639886404799995,
// 37.641606815711995, 39.74150359105728, 40.66550978453656, 40.6100694129278]
console.log(ma);
// [0, 0.6300000000000026, 3.3222000000000023, 0.8093319999999977, 0.33144008000000014,
// 0.36011359520000497, 2.358393184288005, 1.2584964089427189, 0.3344902154634397, 1.6100694129277997].as-console-wrapper{top:0;max-height:100%!important}The results are accurate to more than 2 decimal places and you will need that to calculate the next values correctly. You can change the precision once all the values have been calculated though.
you havent initialized the ma[] at start and used it for initializing ar[] so it producing Nan value.