Hello,
One way of preventing that is to use ?force.
Just put
force(l)
right after the commented out print and before you change 'u'.
Hope this helps,
Rui Barradas
Citando Matthias Gondan <matthias-gon...@gmx.de>:
Dear R developers,
sessionInfo() below
Please have a look at the following two versions of the same function:
1. Intended behavior:
Su1 = function(u=100, l=u, mu=0.53, sigma2=4.3^2)
+ {
+ print(c(u, l, mu)) # here, l is set to u’s value
+ u = u/sqrt(sigma2)
+ l = l/sqrt(sigma2)
+ mu = mu/sqrt(sigma2)
+ print(c(u, l, mu))
+ }
Su1()
[1] 100.00 100.00 0.53
[1] 23.2558140 23.2558140 0.1232558
In the first version, both u and l are correctly divided by 4.3.
2. Strange behavior:
Su2 = function(u=100, l=u, mu=0.53, sigma2=4.3^2)
+ {
+ # print(c(u, l, mu))
+ u = u/sqrt(sigma2)
+ l = l/sqrt(sigma2) # here, l is set to u’s value
+ mu = mu/sqrt(sigma2)
+ print(c(u, l, mu))
+ }
Su2()
[1] 23.2558140 5.4083288 0.1232558
In the second version, the print
function is commented out, so the variable u is
copied to l (lowercase L) at a later place, and L is divided twice by 4.3.
Is this behavior intended? It seems strange that the result depends
on a debugging message.
Best wishes,
Matthias
sessionInfo()
R version 3.4.1 (2017-06-30)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)
Matrix products: default
locale:
[1] LC_COLLATE=German_Germany.1252 LC_CTYPE=German_Germany.1252
LC_MONETARY=German_Germany.1252
[4] LC_NUMERIC=C LC_TIME=German_Germany.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_3.4.1 tools_3.4.1
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
