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| Problem with Singular output for Maple 8 and later https://www.singular.uni-kl.de/forum/viewtopic.php?f=10&t=1482 |
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| Author: | Ablamowicz [ Sat Dec 10, 2005 11:44 pm ] |
| Post subject: | Problem with Singular output for Maple 8 and later |
I am trying to call Singular 3-0-1 from Maple 8 and return result back to Maple 8. Problem is that when Singular writes to a text file that later will be read into Maple, it ends its output with a symbol that looks like [] in Notepad. Then, when using Maple's read command, Maple returns on line 1, unexpected end of input Error, while reading `C:/Maple8/Out.txt` If I open my Out.txt file manually and replace that symbol with ; then Maple has no problem reading the file. I have written my version of SINGULARlink in maple 8 programming language based on a procedure from pages 546-547 in "A Singular Introduction to Commutative Algebra" Does anyone have any suggestions how to get Singular to write ; instead of [] in its output file? I know very little how Singular works and would appreciate some suggestions how to modify its output. Thanks. Rafal Ablamowicz rablamowicz@tntech.edu |
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| Author: | hannes [ Mon Dec 19, 2005 11:26 am ] |
| Post subject: | Re: Problem with Singular output for Maple |
This is probably a problem with line endings on Windows: Windows uses control-m control-j (rn) as end of line. Singular writes file in Unix mode: control-j (n) as end of line (it uses binary mode for opening files). An explanation is given at: http://cygwin.com/faq/faq.api.html#faq.api.cr-lf |
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| Author: | wienand [ Mon Dec 19, 2005 11:58 am ] |
| Post subject: | |
You can use the tools dos2unix and unix2dos to change the line endings of files between the Windows and Unix ways. |
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| Author: | hannes [ Mon Dec 19, 2005 12:02 pm ] |
| Post subject: | fopen mode on windows |
Singular uses ftell/fseek, so binary mode (unix line endings) are needed for input files. But for output files, we will change the mode to DOS-compatible in the next release. |
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| Author: | Guest [ Mon Dec 19, 2005 4:40 pm ] |
| Post subject: | A well working fix to this problem for Maple 8, 9, and 10 |
Thank you to all for replying and suggesting a fix. I have found my own fix too: while Maple 8's "read" command produces the error I have described, Maple 8's "readline" command doesn't. So I am reading in output file Out.txt produced by Singular (both, 2-3-1 and 3-1-0) into Maple 8 without any problems now. It is read line by line and then put together. I have now a very well working procedure that produces a link between Maple 8 - it also works in Maple 9, 9.5, and 10 - and either version of Singular for the purpose of computing Groebner basis in Singular and bringing it back into Maple. It is based somewhat on a similar procedure for connecting with Maple V in the "SINGULAR..." book. If anyone would be interested to try it, I would be glad to emila it or post it here, if it would be of interest to this group. Thanks. Rafal Ablamowicz |
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