Mistake in javascript with NaN in an array -

when execute function in javascript, nan result. seems quite ilogical beacuse arrays employed in operation numerical , shown when alert(); left code here supervision:

function calculation_errors(){           arr_error_p_t2=new array();     for(var i=0;i<arr_p_t1.length;i++){         var k=new number(arr_k_t1[i]);         var p=new number(arr_p_t1[i]);               arr_error_p_t2[i]=(math.sqrt(1+math.pow(m_t2,2)))*(math.sqrt((math.pow(1/k,2)+(math.pow(1/p,2)))));     }     alert(arr_error_p_t2.join('\n')); } 

the reason getting nan because array arr_k_t1 has length smaller array arr_p_t1.

in for loop : trying array element greater own size statement

var k= arr_k_t1[i];

it returns undefined (because have exceeded number of elements in arr_k_t1. in javascript returns undefined if try access non-existent element of array.

then doing mathematical operations on return nan (the result have got).

the solution :

function calculation_errors(){           arr_error_p_t2=new array();      //comment : assuming array "arr_k_t1" atleast of length equal      //array "arr_p_t1" in loop follows      //this wrong assumption , leading "nan" @ end !!     ...     ...     ...rest of code 

edit : haven't been able include remaining code because making post weird. problem lies in for loop accessing element not exist.