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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: space between sign and digit
Date: Thu, 12 Jul 2018 20:42:26 +0200
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Am 12.07.2018 um 07:36 schrieb Jörg Buchholz:
> On 11.07.2018 15:16, Karl Ratzsch wrote:
>> Am 11.07.2018 um 14:16 schrieb Jörg Buchholz:
>>> On 11.07.2018 10:00, Karl Ratzsch wrote:
>>>> plot f11(x) lt 2 lw 4 dt 4 t \
>>>>   sprintf("f11(x) =%.2f·x %s %.2f",a,b11<0?"-":"+",abs(b11))
>>>>
>>>
>>> Interesting solution. On more complex functions the code is a bit long.
>>
>> You're welcome. ;-) This looks a bit nicer
>>
>>   nstr(x) = sprintf("%s %.2f",x<0?"-":"+",abs(x)) # return string with a
>> space between sign and number
>>
>>   plot f11(x) title sprintf("f11(x) =%.2f·x %s",a,nstr(b11))
>>
>> or you can even outsource the whole sprintf() call into a function
>>
>>   tstr(n,a,b) = sprintf("%s = %.2f·x %s %.2f",n,a,b<0?"-":"+",abs(b))
>>
>>   plot f11(x) title tstr("f11(x)",a,b11)
>>
>> so your plot command stays readable.
> 
> It is the right direction, something like a "newcommand" in LaTex that
> makes the daily work easier.
> 
> But I need the %.2f variable, cause sometimes there are numbers which
> needs more or less digits after the floating point.

That's something missing in sprintf(), a way to give the overall
number of significant digits for fp output. You can of course use
exponential notation.

Or write a function that uses sprintf() to construct a customised
format string for another sprintf() function call.

  #syntax tstr(fnamstr,a,b,b_ndecimals)
  tstr(n,a,b,bs) = sprintf("%s = %.2f·x %s
%.".sprintf("%.f",bs)."f",n,a,b<0?"-":"+",abs(b))

 ;-)