D3.js | d3.deviation() function
Last Updated :
26 Jun, 2019
The d3.deviation() function in D3.js is used to return the standard deviation of the given array’s elements. If the array is having less than two elements then it returns undefined.
Syntax:
d3.deviation(Array)
Parameters: This function accepts a parameters Array which is an array of elements whose standard deviation are to be calculated. Here elements should be integers not string otherwise it returns undefined.
Return Value: It returns the standard deviation of the given array’s element.
Below programs illustrate the d3.deviation() function in D3.js.
Example 1:
<html>
<head>
<title>
Getting standard deviation of
the elements of given array
</title>
</head>
<body>
</script>
<script>
var Array1 = [10, 20, 30, 40, 50, 60];
var Array2 = [1, 2];
var Array3 = [0, 1.5, 6.8];
var Array4 = [.8, .08, .008];
A = d3.deviation(Array1);
B = d3.deviation(Array2);
C = d3.deviation(Array3);
D = d3.deviation(Array4);
document.write(A + "<br>");
document.write(B + "<br>");
document.write(C + "<br>");
document.write(D + "<br>");
</script>
</body>
</html>
|
Output:
18.708286933869708
0.7071067811865476
3.572580766523457
0.4379589021814719
Example 2:
<html>
<head>
<title>
Getting standard deviation
of the elements of given array
</title>
</head>
<body>
</script>
<script>
var Array1 = [1];
var Array2 = ["a", "b", "c"];
var Array3 = [1, 2, "B", "C"];
var Array4 = ["Geek", "Geeks", 2, 3, "GeeksforGeeks"];
A = d3.deviation(Array1);
B = d3.deviation(Array2);
C = d3.deviation(Array3);
D = d3.deviation(Array4);
document.write(A + "<br>");
document.write(B + "<br>");
document.write(C + "<br>");
document.write(D + "<br>");
</script>
</body>
</html>
|
Output:
undefined
undefined
0.7071067811865476
0.7071067811865476
Note: In the above output, if the parameter is having less than one elements or strings then it returns undefined and if the parameter is having string including some integers value then the standard deviation of the integer’s value is returned.
Ref: https://devdocs.io/d3~4/d3-array#deviation
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