[Scilab-users] printf bug?

Stéphane Mottelet stephane.mottelet at utc.fr
Mon Oct 20 21:04:40 CEST 2014 

In the help page of "string"  it is said that its output depends on 
display parameters which are defined with the format macro, i.e. you get 
the same output
with

-->string(%pi)

and

-->disp(%pi)

So it is just a feature, not a bug :-D

S.

Le 20/10/2014 19:49, Stefan Du Rietz a écrit :
> But why the difference between msprintf() and string()?
>
> Stefan
>
> On 2014-10-20 18:19, Stéphane Mottelet wrote:
>> Hello,
>>
>> I think that the decimal separator is controlled by the LC_NUMERIC or
>> the LANG environment variable. With my local install
>> (LANG=fr_FR.UTF-8) I get
>>
>> -->msprintf("%0.1f",1.2345)
>>   ans  =
>>
>>   1.2
>>
>> S.
>>
>> Le 20/10/2014 17:48, Stefan Du Rietz a écrit :
>>> 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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