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Arrays cannot be resized (though use of the System.arraycopy() method can allow for multi-step array resizing) Arrays can be resized while preserving existing values using the Array.Resize() static array method (but this may return a new array).
X a = X (); // valid given X(const X& copy_from_me) but not valid given X(X& copy_from_me) // because the second wants a non-const X& // to create a, the compiler first creates a temporary by invoking the default constructor // of X, then uses the copy constructor to initialize as a copy of that temporary.
is how one would use Fortran to create arrays from the even and odd entries of an array. Another common use of vectorized indices is a filtering operation. Consider a clipping operation of a sine wave where amplitudes larger than 0.5 are to be set to 0.5. Using S-Lang, this can be done by y = sin(x); y[where(abs(y)>0.5)] = 0.5;
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This choice precludes the implementation of array types as array data structures. That is, those languages use array-like syntax to implement a more general associative array semantics, and must therefore be implemented by a hash table or some other search data structure.
In computer programming, the stride of an array (also referred to as increment, pitch or step size) is the number of locations in memory between beginnings of successive array elements, measured in bytes or in units of the size of the array's elements.
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Copy-on-write (COW), also called implicit sharing [1] or shadowing, [2] is a resource-management technique [3] used in programming to manage shared data efficiently. Instead of copying data right away when multiple programs use it, the same data is shared between programs until one tries to modify it.