Which library do I have to include in order to use "valarray"

[Michael Thuswaldner]

Hello!

According to C++ reference literature one should use valarray instead of 
arrays or vector to represent Vectors and Matrices for Numeric 
implementations. However to include the header file valarray.h, as the 
literature suggests, does not do the trick!

Which header file should I include?

Best Regards,

Michael

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