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Here is a further reduced example (see below). Now it is a function to count NaNs in a vector, and it shows the same behaviour. Code is also available at https://github.com/jwkruisselbrink/rcpp-timings/tree/master/minimal. Regarding...
Moving the call outside the main loop would be effective for some scenarios (i.e, the scenarios where the data objects do not contain NaNs). However, once they do we still want to compute a distance based on the values...
> Take care to distinguish the R-core ISNAN macro, the R_IsNaN function, > and the Rcpp::isNaN template function. Asides from sugar-stuff, all > the examples discussed here so far address the performance of R-core > ISNAN, given doubles that...
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