Dear list,
I have a balance connected to the serial port of a windows machine ("COM1") and
I read the text
output of the balance with
scan("COM1", what="character", sep="\n", n=1)
after calling the previous line I press the print key on the balance which
triggers sending one line
of text to the serial connection and with R 2.9.2 I get something like
Read 1 item
"+ 32.004 mg"
Now with R 2.10.1 (and previously with 2.10.0) I have to press the print key on
the balance twice to
get the same result, thus apparently I have to send two lines of text to make
scan() reading only
one. But this is only when reading from the serial port, not when reading from
a text file on disk.
The same is true for 2.10.1 on Linux (I did not try 2.9.2 nor 2.10.0 on Linux).
I can't figure out from the documentation nor the NEWS whether something should
be specified
differently when calling scan since 2.10.0. Any ideas what this behaviour comes
from?
Here the sessionInfo() for the three cases I have tested:
R version 2.9.2 (2009-08-24)
i386-pc-mingw32
locale:
LC_COLLATE=German_Germany.1252;LC_CTYPE=German_Germany.1252;LC_MONETARY=German_Germany.1252;LC_NUMERIC=C;LC_TIME=German_Germany.1252
attached base packages:
[1] stats graphics grDevices utils datasets
[6] methods base
respectively:
R version 2.10.1 (2009-12-14)
i386-pc-mingw32
locale:
[1] LC_COLLATE=German_Germany.1252 LC_CTYPE=German_Germany.1252
[3] LC_MONETARY=German_Germany.1252 LC_NUMERIC=C
[5] LC_TIME=German_Germany.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
respectively:
R version 2.10.1 (2009-12-14)
x86_64-unknown-linux-gnu
locale:
[1] LC_CTYPE=de_DE.UTF-8 LC_NUMERIC=C
[3] LC_TIME=de_DE.UTF-8 LC_COLLATE=de_DE.UTF-8
[5] LC_MONETARY=C LC_MESSAGES=de_DE.UTF-8
[7] LC_PAPER=de_DE.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=de_DE.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils methods base
other attached packages:
[1] lattice_0.17-26 RODBC_1.3-1
loaded via a namespace (and not attached):
[1] grid_2.10.1
Thanks a lot!
Tom
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