Hi Joseph,

did StackExchange accept it as a bug or did Wolfram Research also acknowledge a bug? (I understand that you contacted them?)

Best wishes,

Marco

Dear Joseph

,I think that I did not explain that well enough. The post I linked to says that there was a known issue with the way import read CSV files. Let's assume that also Export did not fully conform to the CSV standard.

Apparently, this has been fixed in version 11.2.; that comes at a little cost. The fiscal files before MMA 11.2 show that issue and therefore are not being read directly in MMA 11.2.

That means that you are probably just seeing the consequences of the fix and not a (new) bug. This is consistent with the observation that you can export and then read the data in MMA 11.2.

The post that I linked to above shows that there was an issue with the return "\r" in the older versions. ( I only found that post after I had the solution, because I knew what to look for.) What you see is only a consequence. But I agree that other users could be hit by the same issue.

If I am right, it is. it that Wolfram will have to fix this: they just have!

Best wishes,

Marco

Hi Marco, Thanks for replying. Please see the link at the top of this posting for the original posting, with code available. I've been using downloads of 100,000 row WolfRam StarData for a while now, with the same set of CSV Import and Export statements, across a number of different release of Mathematica without issue, until Mathematica 11.2. For 11 CSV files, of 10,000 rows each, at 1 MB per file, the import times were around 2 seconds per file. Without any change of the Import statements, the file Imports under Mathematica 11.2 now take over 250 seconds per file. And, unless you were looking for it with a Length function, rows were truncated on the imports, by many thousands, on each Import. A Mathematica support blog recommended trying the "TextDelimiters"->"" parameter on Imports under Mathematica 11.2 to fix the truncation issues. That worked. But as the image at top of the page image shows, the Import under Mathematica 11.2 with the "TextDelimiters"->"" parameter ran in 250 seconds, while the same file imported under Mathematica 11.1 ran in 2 seconds. I've opened a bug report with WolfRam on this. This should of never occurred. Other users without realizing it, may be impacted by the truncation issue. And CSV import times of 250 seconds on a 1 MB file are unheard of. It needs to be fixed by WolfRam, before it impacts other users of Mathematica. Thanks again!!!

Hi, I' m on 11.2 with Windows 10. When I Import the file (standard Import) the data seems ragged. One column was missing data here and there. Import went fast (0.5 sec). I opened the file with Excel and saw some "strange" field like carbon‐oxygen white dwarf I saved the file in MSDOS CSV and reimported. Now the file seemed to read in: Still don't know if it's like expected.