12_Numerics.md

12. Numerics

12.2 Mathematical Functions

• <cmaths> has all the standard stuff
• <complex> has the equivalents for complex numbers
• Errors are written to errno

12.3 Numerical Algorithms

• <numeric> for more common algorithms
• accumulate, inner_product, partial_sum, adjacent_difference
• There are also more general functions that allow replacing the default operation (e.g. + for accumulate) with a custom function
• iota for numeric ranges

12.4 Complex Numbers

• complex is a template to make it possible to set the type of the real and imaginary components

12.5 Random Numbers

• Random number generators consist of two components:
  1. An engine that produces a sequence of random values
  2. A distribution that maps those values respectively
• E.g. uniform_int_distribution accepts an engine as an argument, such as default_random_engine
• auto dice = bind(uniform_int_distribution{1, 6}(default_random_engine{})
• Binding an engine to a distribution yields a random number generator

12.6 Vector Arithmetic

• valarray helps with multidimensional arrays
• It has support for stride access