What is happening here is that the compiler makes a legitimate
optimization, but that runs into a long-standing issue, not related to
compilation, with certain assignment expressions in arguments. The
general issue will take some time to address; hopefully it will be
resolved in time for the next
Thanks.
Here is a simplified version:
library(compiler)
zero <- 0
one <- 1
expr <- quote((z <- zero + one) + (z <- z + 1))
eval(compiler::compile(expr))
Sill fix shortly.
Best,
luke
On Thu, 24 Aug 2017, Lukas Stadler wrote:
Hi!
We’ve seen a problem with the compiler in specific cases of m
Hi!
We’ve seen a problem with the compiler in specific cases of matrix updates:
> { m <- matrix(1:4, 2) ; z <- 0; for(i in 1) { m[z <- z + 1,z <- z + 1] <- 99;
> } ; m }
[,1] [,2]
[1,]13
[2,]2 99
Here, it modifies element [2,2], which is unexpected.
It behaves correct without
