Given a function ##\psi## having ##N## components, how would you (as fast as possible) construct ##\psi'## also having ##N## components? I thought about taking a forward finite difference approach on the first ##N-1## components of ##\psi## to generate ##\psi'## and then a backward finite difference approach to generate the last (##Nth##) component of ##\psi'##.(adsbygoogle = window.adsbygoogle || []).push({});

Any faster ideas or better ways? Thanks!

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# A Better way to find Finite Difference

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