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Add method for constructing diffops to multistage approach of computing the residual viscosity. Differentiate between constructDiffOpsMultiGrid and constructDiffOpsMultiStage
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Fri, 28 Jun 2019 13:12:29 +0200
parents f6ada1719420
children
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function u = ifour(u_hat)
    u_hat = ifftshift(u_hat);
    u = ifft(u_hat);
end