valarray log() function in C++ Last Updated : 24 Oct, 2018 Comments Improve Suggest changes Like Article Like Report 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:- CPP // C++ program to demonstrate // example of log() function. #include<bits/stdc++.h> using namespace std; int main() { // Initializing valarray valarray<double> varr = { 1, 2, 3, 4, 5 }; // Declaring new valarray valarray<double> varr1 ; // use of log() function varr1 = log(varr); // Displaying new elements value cout << "The new valarray with" << " manipulated values is : " << endl; for (double& x : varr1) { cout << x << " "; } cout << endl; return 0; } Output: The new valarray with manipulated values is : 0 0.693147 1.09861 1.38629 1.60944 Example 2:- CPP // C++ program to demonstrate // example of log() function. #include<bits/stdc++.h> using namespace std; int main() { // Initializing valarray valarray<double> varr = { -1, 6, 3, 45, 5 }; // Declaring new valarray valarray<double> varr1 ; // use of log() function varr1 = log(varr); // Displaying new elements value cout << "The new valarray with" << " manipulated values is : " << endl; for (double& x : varr1) { cout << x << " "; } cout << endl; return 0; } Output: The new valarray with manipulated values is : nan 1.79176 1.09861 3.80666 1.60944 Comment More infoAdvertise with us Next Article valarray log() function in C++ B bansal_rtk_ Follow Improve Article Tags : Misc C++ CPP-Functions cpp-valarray Practice Tags : CPPMisc Similar Reads valarray log10() function in C++ The log10() function is defined in valarray header file. This function is used to calculate common logarithm of the value of the elements in valarray. Syntax: log10(varr); Parameter: This function takes a mandatory parameter varr which represents valarray. Returns: This function returns a valarray c 2 min read valarray pow() function in C++ The pow() function is defined in valarray header file. This function returns a valarray containing the results of the power operation on all the elements, in the same order. Syntax: pow(varr, n); Parameter: varr: This represents the valarray object.n: It represents a exponent value. Returns: This fu 2 min read valarray tan() function in C++ The tan() function is defined in valarray header file. This function is used to calculate tangent of the value of each element in valarray and returns a valarray containing the tangent of all the elements. Syntax: tan(varr); Parameter: This function takes a mandatory parameter varr which represents 2 min read valarray sin() function in C++ The sin() function is defined in valarray header file. This function is used to calculate sine of the value of each element in valarray and returns a valarray containing the sines of all the elements. Syntax: sin(varr); Time Complexity: O(n)Auxiliary Space: O(n) Parameter: This function takes a mand 2 min read valarray sqrt() function in C++ The sqrt() function is defined in valarray header file. This function is used to calculate square root of the value of each element in valarray. Syntax: sqrt(varr); Parameter: This function takes a mandatory parameter varr which represents valarray. Returns: This function returns a valarray containi 2 min read Like