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RE: Latex warnings using exams2pdf [ Reply ] By: Achim Zeileis on 2023-09-18 11:46	[forum:49768]
Ah, sorry, then my idea doesn't help... I'll wait for a bit more and when there is no follow-up I'll try posting a GitHub issue for the tinytex R package.

RE: Latex warnings using exams2pdf [ Reply ] By: Francisco Goerlich on 2023-09-18 11:40

[forum:49767]

Hi Achim, Many thanks. I am afraid that I installed TinyTeX LaTeX distribution via tinytex::install_tinytex, since in the first attempt to compile a pdf exam I got an error. In fact, > tinytex::is_tinytex() [1] TRUE and tinytex::tinytex_root() [1] "C:\\Users\\Francisco Goerlich\\AppData\\Roaming\\TinyTeX" I am under case 3 of https://www.R-exams.org/tutorials/latex/. I also think this is weird, since I not always get the warnings I mentioned before. Many thanks in any case.

RE: Latex warnings using exams2pdf [ Reply ] By: Achim Zeileis on 2023-09-18 07:36

[forum:49766]

Francisco, I think you are using your system LaTeX installation, right? (I mean: You have only installed the "tinytex" R package but not the TinyTeX LaTeX distribution via tinytex::install_tinytex.) In that case you could try setting: options(exams_tex = "tools") If after that, you don't get the warnings anymore, you could also simply de-install the "tinytex" R package. More details: https://www.R-exams.org/tutorials/latex/

RE: Latex warnings using exams2pdf [ Reply ] By: Francisco Goerlich on 2023-09-14 09:29

[forum:49764]

Hi, In cheking all my exercises I found similar warnings that are not solved by the previous solution (\usepackage[nofontenc]{Sweave} instead of \usepackage{Sweave}) Warning messages: 1: In grep("^(LaTeX|Package [[:alnum:]]+) Warning:", x) : unable to translate ' also. Si tenemos \emph{n} clases la \textbf{matriz de confusi<c3>...]) (./exercise06.tex' to a wide string 2: In grep("^(LaTeX|Package [[:alnum:]]+) Warning:", x) : input string 397 is invalid 3: In grep("^\\s*$", x) : unable to translate ' also. Si tenemos \emph{n} clases la \textbf{matriz de confusi<c3>...]) (./exercise06.tex' to a wide string 4: In grep("^\\s*$", x) : input string 397 is invalid 5: In xfun::read_utf8(log) : The file mytemplate1.log is not encoded in UTF-8. These lines contain invalid UTF-8 characters: 397 6: In grep("^(LaTeX|Package [[:alnum:]]+) Warning:", x) : unable to translate ' also. Si tenemos \emph{n} clases la \textbf{matriz de confusi<c3>...]) (./exercise06.tex' to a wide string 7: In grep("^(LaTeX|Package [[:alnum:]]+) Warning:", x) : input string 397 is invalid Probably there is a similar workaround, but I couldn't figure it out. Thanks a lot

RE: Latex warnings using exams2pdf [ Reply ] By: Francisco Goerlich on 2023-09-14 08:14

[forum:49763] Latex_2.zip (2) downloads

Hi Achim, Hyphenation works with both templates, plain.tex and myplain.tex I attach an example, and the pdf produced. Note that myplain.tex produces a pdf with much higher resolution, so it has a bigger size but can be seen better on the screen. Also with this example, that also contains accented words ("excepción") I get no warnings with plain.tex (netither with myplain.tex, off course). This is a mistery for my! Thanks for the repex on SO.

RE: Latex warnings using exams2pdf [ Reply ] By: Achim Zeileis on 2023-09-14 07:38	[forum:49762]
I have posted a minimal self-contained example on StackOverflow now: https://stackoverflow.com/questions/77102701/tinytex-warnings-due-to-t1-fontenc-and-latin1-log-file

RE: Latex warnings using exams2pdf [ Reply ] By: Achim Zeileis on 2023-09-13 19:01

[forum:49761]

Thanks for checking Francisco! I don't understand why this is needed either. I still think this is weird. Meanwhile I tried to look up what the potential downsides are from using the T1 font encoding, see: https://tex.stackexchange.com/questions/664/why-should-i-use-usepackaget1fontenc However, I couldn't find any problems with the PDFs I tried. Copy & paste of accented characters from the PDF worked correctly. Maybe you could check whether hyphenation still works?

RE: Latex warnings using exams2pdf [ Reply ] By: Francisco Goerlich on 2023-09-13 14:39	[forum:49760]
I have generated 52 test with 10 questions each and I got any warning after modifying my templates the same as you did: exchanging \usepackage{Sweave} with \usepackage[nofontenc]{Sweave}. Congratulations, even I don´t understand why this works. Many thanks,

RE: Latex warnings using exams2pdf [ Reply ] By: Francisco Goerlich on 2023-09-13 14:27	[forum:49759]
Yes, exams2pdf(file, template = "myplain") works without any warning! I don´t know why but it seems to work. I´m going to try with the full test and let you know. Thanks a lot Achim.

RE: Latex warnings using exams2pdf [ Reply ] By: Achim Zeileis on 2023-09-12 23:14

[forum:49757] myplain.tex (4) downloads

I haven't seen any cases where these errors are critical. I also still don't really understand why they are happening. It's still the overfull hbox with non-UTF-8 characters. Possibly tinytex changed the way how the .log is processed, increasing the number of warnings. Playing around a bit, I think that possibly the warnings can be avoided when omitting the T1 font encoding. So I made a copy of "plain.tex" to "myplain.tex" and exchanged the simply \usepackage{Sweave} with \usepackage[nofontenc]{Sweave}. See attached. Could you try whether exams2pdf(..., template = "myplain.tex") works for you?

Latex warnings using exams2pdf [ Reply ] By: Francisco Goerlich on 2023-09-12 21:07

[forum:49756] Latex.zip (5) downloads

Hi, Generaring pdf exams with exams2pdf() and tinytex installed I get a lot of warnings of the following type: Warning messages: 1: In grep("^(LaTeX|Package [[:alnum:]]+) Warning:", x) : unable to translate '\T1/phv/m/n/10 toma dos val-ores ar-bi-trar-ios y en con-se-cuen-cia es una \T1/phv/b/n/10 vari-able cual-i-ta-tiva di-cot<f3>mica\T1/phv/m/n/10 . ' to a wide string 2: In grep("^(LaTeX|Package [[:alnum:]]+) Warning:", x) : input string 245 is invalid 3: In xfun::read_utf8(log) : The file solution1.log is not encoded in UTF-8. These lines contain invalid UTF-8 characters: 244 4: In grep("^(LaTeX|Package [[:alnum:]]+) Warning:", x) : unable to translate '\T1/phv/m/n/10 toma dos val-ores ar-bi-trar-ios y en con-se-cuen-cia es una \T1/phv/b/n/10 vari-able cual-i-ta-tiva di-cot<f3>mica\T1/phv/m/n/10 . ' to a wide string 5: In grep("^(LaTeX|Package [[:alnum:]]+) Warning:", x) : input string 244 is invalid In addition to the known warning about "The file solution1.log is not encoded in UTF-8" (see https://r-forge.r-project.org/forum/message.php?msg_id=49126) the other ones are new this year. However the problems seem to be well generated. See an example attached. I wonder if this is something to worry about or I can savely ignored the messages. Thanks a lot.