[Scilab-users] printf bug?

Mon Oct 20 17:48:36 CEST 2014

Hello,
look here:

-->x = 1.2345
  x  =
     1.2345
-->msprintf("%0.1f", x)
  ans  =
  1,2
-->string(0.1 * floor(10 * x))
  ans  =
  1.2

This could cause disastrous results, e.g. when written to files ...

Regards
Stefan

On 2014-08-02 22:35, Stefan Du Rietz wrote:
> With "Scilab" here, I mean Scilab 5.5.0.
>
> On 2014-08-02 22:30, Stefan Du Rietz wrote:
>> Thank you, Leon,
>> it confirms that Scilab 5.4.1 handles it correctly.
>>
>> But when I have LC_NUMERIC="en_DK.utf8" which means decimal comma, see
>> below, Scilab is in error:
>> -->msprintf("%0.2f", %pi)
>>   ans  =
>>   3,14
>> -->msprintf("%0.2f", 3.1416)
>>   ans  =
>>   3,14
>>
>> Compare the correct handling in Python:
>>  >>> "Pi with two decimals is %0.2f" % 3.1416
>> 'Pi with two decimals is 3.14'
>>
>> Can any of the developers comment on this, or shall I report a bug?
>>
>> Regards
>> Stefan
>>
>> stefan at Asus1:~$ uname -a
>> Linux Asus1 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:12 UTC
>> 2014 i686 i686 i686 GNU/Linux
>> stefan at Asus1:~$ locale
>> LANG=en_GB.UTF-8
>> LANGUAGE=en_GB:en
>> LC_CTYPE="en_DK.utf8"
>> LC_NUMERIC="en_DK.utf8"
>> LC_TIME="en_DK.utf8"
>> LC_COLLATE="en_DK.utf8"
>> LC_MONETARY="en_DK.utf8"
>> LC_MESSAGES="en_DK.utf8"
>> LC_PAPER="en_DK.utf8"
>> LC_NAME="en_DK.utf8"
>> LC_ADDRESS="en_DK.utf8"
>> LC_TELEPHONE="en_DK.utf8"
>> LC_MEASUREMENT="en_DK.utf8"
>> LC_IDENTIFICATION="en_DK.utf8"
>> LC_ALL=en_DK.utf8
>>
>>
>> On 2014-07-30 07:25, Leon Bevc wrote:
>>> Here is output from openSuse 13.1 and Scilab 5.4.1:
>>> ---------------------------
>>> lebevc at linux-xkf0:~> uname -a
>>> Linux linux-xkf0.site 3.15.3-1.g42bf625-desktop #1 SMP PREEMPT
>>> Wed Jul 2 09:23:08 UTC 2014 (42bf625) x86_64 x86_64 x86_64 GNU/Linux
>>> ---------------------------
>>> lebevc at linux-xkf0:~> locale
>>> LANG=sl_SI.UTF-8
>>> LC_CTYPE="sl_SI.UTF-8"
>>> LC_NUMERIC="sl_SI.UTF-8"
>>> LC_TIME="sl_SI.UTF-8"
>>> LC_COLLATE="sl_SI.UTF-8"
>>> LC_MONETARY="sl_SI.UTF-8"
>>> LC_MESSAGES="sl_SI.UTF-8"
>>> LC_PAPER="sl_SI.UTF-8"
>>> LC_NAME="sl_SI.UTF-8"
>>> LC_ADDRESS="sl_SI.UTF-8"
>>> LC_TELEPHONE="sl_SI.UTF-8"
>>> LC_MEASUREMENT="sl_SI.UTF-8"
>>> LC_IDENTIFICATION="sl_SI.UTF-8"
>>> LC_ALL=
>>> ---------------------------
>>> lebevc at linux-xkf0:~>  printf "%0.2f\n" 3.1416
>>> bash: printf: 3.1416: invalid number
>>> 0,00
>>> lebevc at linux-xkf0:~> printf "%0.2f\n" 3,1416
>>> 3,14
>>>
>>> //-----Scilab---------------------
>>>
>>> -->ver
>>> Scilab Version:   5.4.1.1364497457
>>>
>>> -->x = 0.12345
>>>   x  =
>>>      0.12345
>>>
>>> -->xstr = msprintf("%0.2f", x)
>>>   xstr  =
>>>   0.12
>>>
>>>
>>> 2014-07-29 22:41 GMT+02:00 Stefan Du Rietz <sdr at durietz.se
>>> <mailto:sdr at durietz.se>>:
>>>
>>>     Leon, Can you please try it with Scilab 5.4.1 under openSUSE? And
>>>     can you show its Bash output from
>>>     $ locale
>>>
>>>     When I was running Scilab 5.4.1 under Xubuntu 12.04, printf worked
>>>     OK, but also in Bash. So the question is: Why do you now get
>>>     different results in Scilab and Bash?
>>>
>>>     And *the important point*: Why should a mathematics program handle
>>>     inputs differently from outputs?
>>>
>>>     If one should handle decimal separators differently depending on
>>>     the local language, it should be done consistently (as in Bash,
>>>     even if I don't like it)!
>>>
>>>     One could of course have special functions or arguments to present
>>>     numbers in specific local formats.
>>>
>>>     Stefan
>>>
>>>
>>>
>>>     On 2014-07-29 19:41, Leon Bevc wrote:
>>>
>>>         Strange...
>>>
>>>         In this case I got the same result as you on Xubuntu and
>>> openSUSE:
>>>
>>>         [ xUbuntu 14.04.1 - 32bit / Scilab 5.5.0 / LANG=sl_SI.UTF-8 ]
>>>         lebevc at book-PC:~$ printf "%0.2f\n" 3.1416
>>>         bash: printf: 3.1416: neveljavno število
>>>         0,00
>>>         lebevc at book-PC:~$ printf "%0.2f\n" 3,1416
>>>         3,14
>>>
>>>
>>> ------------------------------__------------------------------__----------
>>>
>>>
>>>         [ openSUSE 13.1-64bit ; Scilab 5.4.1]
>>>         lebevc at linux-xkf0:~> printf "%0.2f\n" 3.1416
>>>         bash: printf: 3.1416: invalid number
>>>         0,00
>>>         lebevc at linux-xkf0:~> printf "%0.2f\n" 3,1416
>>>         3,14
>>>
>>>         -->x = 0.6231166;
>>>         -->xstr = msprintf("%0.2f", x)
>>>            xstr  =
>>>            0.62
>>>
>>>
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