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formating title using columnhead

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  formating  title using columnhead ab <ab.3942@googlemail.com> - 2013-01-31 23:13 -0800
    Re: formating  title using columnhead Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2013-02-01 20:15 +0100
      Re: formating  title using columnhead ab <ab.3942@googlemail.com> - 2013-02-03 23:46 -0800
        Re: formating  title using columnhead Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2013-02-04 16:21 +0100

#1591 — formating title using columnhead

Hi,
with gnuplot 4.6   i do 
  plot "data" u 1:5  title columnhead(5)

which works fine.  My columnhead is a real number which i want to format.

   plot "data" u 1:5  title gprintf("%5.2e",columnhead(5))
does not work, it shows a 0.0  as title.

Is this a bug or a non- implemented feature?

I can use gprintf with a string argument like:
   plot "data" u 1:5  title gprintf("%5.2e","345.345")

I can manipulate the columnhead string:
  plot "data" u 1:5  title "Title :".columnhead(5)

But the combination does not work.
Any ideas how to solve this?

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#1594

On 01.02.2013 08:13, ab wrote:
>
>     plot "data" u 1:5  title gprintf("%5.2e",columnhead(5))
> does not work, it shows a 0.0  as title.

That's not particularly surprising, what with columnhead() being a 
_string_ valued function, but you're promising to gprintf() that you'll 
be passing a number.

> Is this a bug or a non- implemented feature?
>
> I can use gprintf with a string argument like:
>     plot "data" u 1:5  title gprintf("%5.2e","345.345")

The line between string and numeric literals have become somewhat 
blurred in recent gnuplot.  Otherwise this wouldn't have worked either.

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#1598

>> 
>>     plot "data" u 1:5  title gprintf("%5.2e",columnhead(5)) 
>> does not work, it shows a 0.0  as title. 

> That's not particularly surprising, what with columnhead() being a 
> _string_ valued function, but you're promising to gprintf() that you'll 
> be passing a number. 

There is no explicit command to convert strings to numbers.
The manual states:
"A string which contains a numerical value is promoted to the corresponding
 integer or real value if used in a numerical expression."
In my opinion it is therefore allowed to use gprintf with a string. 

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#1599

On 04.02.2013 08:46, ab wrote:

> The manual states:
> "A string which contains a numerical value is promoted to the corresponding
>   integer or real value if used in a numerical expression."

That might apply if columnvalue() hat been used in a numerical 
expression here.  But using it as the argument of gprintf() doesn't 
really satisfy such a condition.

I would probably try something like

	gprintf("%5.2e", 0.0+columnhead(5) )

That is actually using columnhead(5) in a numeric expression.

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