Skip to main content

bugs - How to workaround failures with Unicode filepaths?


(Cross-posted on the Wolfram Community, reported to the support as [CASE:3965891].)


The Mathematica's Kernel and FrontEnd currently work well with Unicode file/directory paths, but some other components of the system contain long-standing bugs which are source of troubles for the users, especially for the users from non-English-speaking countries.


The most recent version of Mathematica 12.0 still fails to Import a PDF file when its path contains non-ASCII characters: under Windows Import returns $Failed, under OSX it returns empty list. This is due to a long-standing bug in the component "PDF.exe" which is responsible for importing of PDF files:


Export["Тест.pdf", ""]
Import[%]


"Тест.pdf"    
$Failed


The same is true for Importing Mathematica's native NB files as "Plaintext" due to a similar long-standing bug in "NBImport.exe":


Export["Тест.nb", ""]
Import[%, {"NB", "Plaintext"}]


"Тест.nb"
$Failed

The new in version 11 HTTPRequest/URLRead functionality also suffer from this bug. Here is an attempt to upload an image with non-ASCII filename to imgur.com using the method from this answer:



Export["Тест.png", Plot[Sin[x], {x, 0, Pi}]]

URLRead[HTTPRequest[
  "http://stackoverflow.com/upload/image", <|
   "Body" -> {"image" -> <|"Content" -> File[%], "MIMEType" -> "image/png"|>}|>]]

screenshot


And undoubtedly there are other components suffering from this bug because reports about problems with Unicode filepaths keep appearing on this site.


Hence it is worth to have a dedicated thread with a collection of general techniques allowing to workaround such problems. This thread is intended exactly for this purpose. Some guidelines:




  • When posting an OS-specific workaround, please include information about OS.

  • If a workaround is limited to local file paths and doesn't work for network paths, please mention this.

  • Each answer should contain elaborated description of only one general method along with its limitations.



Related questions:





Comments

Post a Comment

Popular posts from this blog

front end - keyboard shortcut to invoke Insert new matrix

I frequently need to type in some matrices, and the menu command Insert > Table/Matrix > New... allows matrices with lines drawn between columns and rows, which is very helpful. I would like to make a keyboard shortcut for it, but cannot find the relevant frontend token command (4209405) for it. Since the FullForm[] and InputForm[] of matrices with lines drawn between rows and columns is the same as those without lines, it's hard to do this via 3rd party system-wide text expanders (e.g. autohotkey or atext on mac). How does one assign a keyboard shortcut for the menu item Insert > Table/Matrix > New... , preferably using only mathematica? Thanks! Answer In the MenuSetup.tr (for linux located in the $InstallationDirectory/SystemFiles/FrontEnd/TextResources/X/ directory), I changed the line MenuItem["&New...", "CreateGridBoxDialog"] to read MenuItem["&New...", "CreateGridBoxDialog", MenuKey["m", Modifiers-...
Post a Comment
Read more

How to thread a list

I have data in format data = {{a1, a2}, {b1, b2}, {c1, c2}, {d1, d2}} Tableform: I want to thread it to : tdata = {{{a1, b1}, {a2, b2}}, {{a1, c1}, {a2, c2}}, {{a1, d1}, {a2, d2}}} Tableform: And I would like to do better then pseudofunction[n_] := Transpose[{data2[[1]], data2[[n]]}]; SetAttributes[pseudofunction, Listable]; Range[2, 4] // pseudofunction Here is my benchmark data, where data3 is normal sample of real data. data3 = Drop[ExcelWorkBook[[Column1 ;; Column4]], None, 1]; data2 = {a #, b #, c #, d #} & /@ Range[1, 10^5]; data = RandomReal[{0, 1}, {10^6, 4}]; Here is my benchmark code kptnw[list_] := Transpose[{Table[First@#, {Length@# - 1}], Rest@#}, {3, 1, 2}] &@list kptnw2[list_] := Transpose[{ConstantArray[First@#, Length@# - 1], Rest@#}, {3, 1, 2}] &@list OleksandrR[list_] := Flatten[Outer[List, List@First[list], Rest[list], 1], {{2}, {1, 4}}] paradox2[list_] := Partition[Riffle[list[[1]], #], 2] & /@ Drop[list, 1] RM[list_] := FoldList[Transpose[{First@li...
Post a Comment
Read more

mathematical optimization - Minimizing using indices, error: Part::pkspec1: The expression cannot be used as a part specification

I want to use Minimize where the variables to minimize are indices pointing into an array. Here a MWE that hopefully shows what my problem is. vars = u@# & /@ Range[3]; cons = Flatten@ { Table[(u[j] != #) & /@ vars[[j + 1 ;; -1]], {j, 1, 3 - 1}], 1 vec1 = {1, 2, 3}; vec2 = {1, 2, 3}; Minimize[{Total@((vec1[[#]] - vec2[[u[#]]])^2 & /@ Range[1, 3]), cons}, vars, Integers] The error I get: Part::pkspec1: The expression u[1] cannot be used as a part specification. >> Answer Ok, it seems that one can get around Mathematica trying to evaluate vec2[[u[1]]] too early by using the function Indexed[vec2,u[1]] . The working MWE would then look like the following: vars = u@# & /@ Range[3]; cons = Flatten@{ Table[(u[j] != #) & /@ vars[[j + 1 ;; -1]], {j, 1, 3 - 1}], 1 vec1 = {1, 2, 3}; vec2 = {1, 2, 3}; NMinimize[ {Total@((vec1[[#]] - Indexed[vec2, u[#]])^2 & /@ R...
Post a Comment
Read more