Least-squares function approximation: Difference between revisions

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In [[mathematics]], the idea of '''least squares''' can be applied where is interest in [[function approximation|approximating a given function]] by a weighted sum of other functions. The best approximation can be defined as that which minimises the difference between the original function and the approximation; for a least-squares approach the quality of the approximation is measured in terms of the squared differences the two.
 
====Functional analysis====