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Can use unwrap with input data associated with a function?

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  Can use unwrap with input data associated with a function? Jean-Pierre Coulon <coulon@cacas.pam.obs-nice.fr> - 2018-05-25 09:15 +0200
    Re: Can use unwrap with input data associated with a function? Karl Ratzsch <mail.kfr@gmx.net> - 2018-05-25 09:46 +0200
      Re: Can use unwrap with input data associated with a function? Jean-Pierre Coulon <coulon@cacas.pam.obs-nice.fr> - 2018-05-25 10:10 +0200
        Re: Can use unwrap with input data associated with a function? Karl Ratzsch <mail.kfr@gmx.net> - 2018-05-25 11:24 +0200

#3947 — Can use unwrap with input data associated with a function?

My input file "phasedata.txt" contains:
1e3 -10
3e3 -38
1e4 -40
3e4 -78 
1e5 -80

My gnuplot file is:
reset; set log x; set nolog y; set angle degrees; set grid
set xrange [1e3:1e5]; set yrange [-180:180]; jay = {0,1}; p(x) = jay*x
other(x) = 1/((1 + p(x)/1e4)*(1 + p(x)/1e4)*(1 + p(x)/1e4))
set format y "%.0f%c\260"
set ytics 90; set mytics 2
plot "phasedata.txt" with lines title "simple input data",\
arg(other(x)) title "other function",\
"phasedata.txt" us 1:($2 +arg(other($1))) with lines title "with other 
function, as is",\
"phasedata.txt" us 1:($2 +arg(other($1))) with lines smooth unwrap title 
"unwrapped"

My 3rd plot is correct by my 4th plot is not, even in the [1000:10000] domain, 
where no unwrap job is required. Why?
-- 
Jean-Pierre Coulon

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#3948

Am 25.05.2018 um 09:15 schrieb Jean-Pierre Coulon:
> My input file "phasedata.txt" contains:
> 1e3 -10
> 3e3 -38
> 1e4 -40
> 3e4 -78 1e5 -80
> 
> My gnuplot file is:
> reset; set log x; set nolog y; set angle degrees; set grid
> set xrange [1e3:1e5]; set yrange [-180:180]; jay = {0,1}; p(x) = jay*x
> other(x) = 1/((1 + p(x)/1e4)*(1 + p(x)/1e4)*(1 + p(x)/1e4))
> set format y "%.0f%c\260"
> set ytics 90; set mytics 2
> plot "phasedata.txt" with lines title "simple input data",\
> arg(other(x)) title "other function",\
> "phasedata.txt" us 1:($2 +arg(other($1))) with lines title "with other
> function, as is",\
> "phasedata.txt" us 1:($2 +arg(other($1))) with lines  title
> "unwrapped"
> 
> My 3rd plot is correct by my 4th plot is not, even in the [1000:10000]
> domain, where no unwrap job is required. Why?


I'd say thats a bug. Looks like "smooth unwrap" does not like the "angle
degree" setting.

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#3949

On Fri, 25 May 2018, Karl Ratzsch wrote:

> I'd say thats a bug. Looks like "smooth unwrap" does not like the "angle
> degree" setting.

Thanks. It works if I remove set angle degrees and do the other necessary 
adaptations.
-- 
Jean-Pierre Coulon

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#3950

Am 25.05.2018 um 10:10 schrieb Jean-Pierre Coulon:
> On Fri, 25 May 2018, Karl Ratzsch wrote:
> 
>> I'd say thats a bug. Looks like "smooth unwrap" does not like the "angle
>> degree" setting.
> 
> Thanks. It works if I remove set angle degrees and do the other
> necessary adaptations.

Bug report: https://sourceforge.net/p/gnuplot/bugs/2049/

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