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valarray log() function in C++

Last Updated : 24 Oct, 2018
The log() function is defined in valarray header file. This function is used to calculate natural logarithm of the value of the elements in valarray. Syntax:
log(varr);
Parameter: This function takes a mandatory parameter varr which represents valarray. Returns: This function returns a valarray containing the natural logarithm of all the elements. Below programs illustrate the above function: Example 1:-
Output:
The new valarray with manipulated values is : 
0 0.693147 1.09861 1.38629 1.60944
Example 2:-
Output:
The new valarray with manipulated values is : 
nan 1.79176 1.09861 3.80666 1.60944
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