/* The following code example is taken from the book * "The C++ Standard Library - A Tutorial and Reference" * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */ #include <iostream> #include <valarray> using namespace std; // print valarray line-by-line template<class T> void printValarray (const valarray<T>& va, int num) { for (int i=0; i<va.size()/num; ++i) { for (int j=0; j<num; ++j) { cout << va[i*num+j] << ' '; } cout << endl; } cout << endl; } int main() { /* valarray with 12 elements * - four rows * - three columns */ valarray<double> va(12); // fill valarray with values for (int i=0; i<12; i++) { va[i] = i; } printValarray (va, 3); // assign 77 to all values that are less than 5 va[va<5.0] = 77.0; // add 100 to all values that are greater than 5 and less than 9 va[va>5.0 && va<9.0] = valarray<double>(va[va>5.0 && va<9.0]) + 100.0; printValarray (va, 3); } /* 0 1 2 3 4 5 6 7 8 9 10 11 77 77 77 77 77 5 106 107 108 9 10 11 */
valarray with double value inside
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