point decimal to comma

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Krasimir Terziev
Krasimir Terziev 2020-4-22
评论： Stephen23 2020-4-23
how i can get my result in matlab editor with comma decimal ? i need just to see my result in command window with a comma :)
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darova
darova 2020-4-22
This didn't work for me
dpb
dpb 2020-4-22
Can't read the tiny images to tell what didn't work, but Rik's code works fine in the command window (or as code in function as edited and then executed).
>> n=pi;
>> strrep(sprintf('%.4f',n),'.',',')
ans =
'3,1416'
>>
But, as he says, there's no way I know of to change the behavior in MATLAB to use comma instead of decimal directly.
I thought that was what OS LOCALE settings were for and the idea is that applications were to be written to honor those settings/preferences and deal with transparently. BUT AFAIK, that ideal isn't in MATLAB (if it is in any large app of the ilk; I don't know; never had the opportunity to try/test it).

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回答（1 个）

Rik
Rik 2020-4-22
So in summary: Matlab doesn't check the operating system's locale setting to determine the decimal separator. This question seems to suggest this behavior did actually happen in some situations, but it was (also?) a bug. There is even a doc page that suggests Mathworks will never change this behavior.
As a fallback you can convert a value to a char representation and use strrep on the result:
strrep(sprintf('%.4f',n),'.',',')
%or let Matlab determine an appropriate FormatSpec:
%strrep(num2str(n),'.',',')
The reason for these choices has probably to with code portability: now Matlab doesn't have to worry about the OS settings to interpret a plain text .m file. They could potentially allow it in live scripts, since those aren't plain text. I doubt you will convince them, so you might have to buy Mathworks or otherwise offer unreasonable amounts of money to have this implemented.
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dpb
dpb 2020-4-23
编辑：dpb 2020-4-23
The only concession TMW has made so far is the new(ish) readXXX routines... readmatrix and readvars are the two I can think of now that have name-value pairs of 'Decimal|ThousandsSeparator' to define the behavior for text files.
I'm sure it's a nightmare to try to support their code base that began before anybody in US cared there was such a thing as Europe as a potential market for software; what more try to adapt to them furriners' ways...
I'd be much more pleased if they would just bring complex variables up to full-fledged citizen status. For a scientific-oriented package with a Fortran start, would think 30 years would have been long enough.
Stephen23
Stephen23 2020-4-23
Changing to a decimal comma would then require redefining the comma-separated list separator (otherwise how to interpret max(1,2) ?). If we follow MS Excel's lead the list separator could be the semi-colon, in which case the semi-colon for matrix construction also needs to be redefined.. .to what? There might be other required changes too... it certainly would not be a trivial change to the language.

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