std:: valarray class in C++
C++98 introduced a special container called valarray to hold and provide mathematical operations on arrays efficiently.
- It supports element-wise mathematical operations and various forms of generalized subscript operators, slicing and indirect access.
- As compare to vectors, valarrays are efficient in certain mathematical operations than vectors also.
Public member functions in valarray class : 1. apply() :- This function applies the manipulation given in its arguments to all the valarray elements at once and returns a new valarray with manipulated values. 2. sum() :- This function returns the summation of all the elements of valarrays at once.
The new valarray with manipulated values is : 15 7 25 6 35 The sum of old valarray is : 63 The sum of new valarray is : 88
3. min() :- This function returns the smallest element of valarray. 4. max() :- This function returns the largest element of valarray.
The largest element of valarray is : 30 The smallest element of valarray is : 1
5. shift() :- This function returns the new valarray after shifting elements by the number mentioned in its argument. If the number is positive, left-shift is applied, if number is negative, right-shift is applied. 6. cshift() :- This function returns the new valarray after circularly shifting(rotating) elements by the number mentioned in its argument. If the number is positive, left-circular shift is applied, if number is negative, right-circular shift is applied.
The new valarray after shifting is : 20 1 30 0 0 The new valarray after circular shifting is : 20 1 30 10 2
7. swap() :- This function swaps one valarray with other.
The contents of 1st valarray before swapping are : 1 2 3 4 The contents of 2nd valarray before swapping are : 2 4 6 8 The contents of 1st valarray after swapping are : 2 4 6 8 The contents of 2nd valarray after swapping are : 1 2 3 4
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