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2016 Nov 26
0
methods:::.selectSuperClasses and byte compilation
...enableJIT(0)
system.time(replicate(100,Matrix::crossprod(someMatrix))) ## fast
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By tracing compiler::cmpfun, I found that the reason may be that
invoking Matrix::crossprod calls methods:::.selectSuperClasses which
creates and runs the following function
function (exti) {!isVirtualExt(exti) && length(exti at by) == 0 && exti at simple}
and thus that this function is byte-compiled each time Matrix::crossprod
is called.
Is there a straightforward way for users / R package writers to avoid
such problems, or shouldn't it be fixed in the R sourc...