STL中的valarray

這個貌似是用來做數值計算用的，具體實作不清楚。 下面是MSDN中的說明和例子： // valarray_abs.cpp // compile with: /EHsc #include <valarray> #include <iostream> int main( ) { using namespace std; int i; valarray<int> va1 ( 9 ), va2 ( 9 ); for ( i = 0 ; i < 4 ; i++ ) va1 [ i ] = -i; for ( i = 4 ; i < 9 ; i++ ) va1 [ i ] = i; cout << "The initial valarray is: "; for (i = 0 ; i < 9 ; i++ ) cout << va1 [ i ] << " "; cout << "." << endl; va2 = abs ( va1 ); cout << "The absolute value of the initial valarray is: "; cout << va2 [ i ] << " "; } <valarray> Members

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Updated: November 2007

Reference

Functions

abs	Operates on the elements of an input valarray, returning a valarray whose elements are equal to the absolute value of the elements of the input valarray.
acos	elements are equal to the arccosine of the elements of the input valarray.
asin	elements are equal to the arcsine of the elements of the input valarray.
atan	elements are equal to the principal value of the arctangent of the elements of the input valarray.
atan2	Returns a valarray whose elements are equal to the arctangent of the Cartesian components specified by a combination of constants and elements of valarrays.
cos	elements are equal to the cosine of the elements of the input valarray.
cosh	elements are equal to the hyperbolic cosine of the elements of the input valarray.
exp	elements are equal to the natural exponential of the elements of the input
log	elements are equal to the natural logarithm of the elements of the input
log10	elements are equal to the base 10 or common logarithm of the elements of the input valarray.
pow	Operates on the elements of input valarrays and constants, returning a valarray whose elements are equal to a base specified either by the elements of an input valarray or a constant raised to an exponent specified either by the elements of an input valarray or a constant.
sin	elements are equal to the sine of the elements of the input valarray.
sinh	elements are equal to the hyperbolic sine of the elements of the input valarray.
sqrt	elements are equal to the square root of the elements of the input valarray.
tan	elements are equal to the tangent of the elements of the input valarray.
tanh	elements are equal to the hyperbolic tangent of the elements of the input valarray.