Re: [NTG-context] Metapost labeling question. Please help
Curiouslearn schrieb:
Hi,
I want the labels as (0.5,0.55,0.6,0.65,0.7,...,1)
or (0.50,0.55,0.60,0.65,0.70,...,1). Either of these two is fine.
I tried the following code for this.
\starttext
\startuseMPgraphic{labeltest}
numeric rmin,rmax;
rmin := 0.5; rmax := 1;
ux := 25cm; uy :=10cm;
% draw axes
draw (rmin,0)*ux -- (rmax+0.1,0)*ux;
draw (rmin,0)*ux -- (rmin*ux,(1.1)*uy);
for x = 0.5 step 0.05 until 1.1:
label.bot(textext(decimal(x)),(x*ux,x*uy));
you accumulate the rounding error with every step of the loop. try to
avoid such 'low value' steps if possible.
for x = 10 step 1 until 22: % 0.05*20 to get an integer loop index
tx := x/20; % correct value
label.bot(textext(decimal(tx)),(tx*ux,tx*uy));
Best wishes, Peter
endfor;
\stopuseMPgraphic
\useMPgraphic{labeltest}
\stoptext
I get (0.5,0.55, 0.6,0.65001,0.70001,0.75002,...,1.3) instead. I
don't understand why I get more than 2 digits after 0.6. Is there a
way to restrict the number of digits after the decimal point.
Thanks very much.
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Re: [NTG-context] Metapost labeling question. Please help
Mojca and Peter, thanks very much for your responses. I used Peter's
solution and it worked beautifully.
Does anyone know how I can change the size of these labels? If I try
textext(\tfa decimal(tx))
that does not work.
On Fri, Apr 3, 2009 at 6:52 AM, Peter Rolf indi...@gmx.net wrote:
Curiouslearn schrieb:
Hi,
I want the labels as (0.5,0.55,0.6,0.65,0.7,...,1) or
(0.50,0.55,0.60,0.65,0.70,...,1). Either of these two is fine.
I tried the following code for this.
\starttext
\startuseMPgraphic{labeltest}
numeric rmin,rmax;
rmin := 0.5; rmax := 1;
ux := 25cm; uy :=10cm;
% draw axes
draw (rmin,0)*ux -- (rmax+0.1,0)*ux;
draw (rmin,0)*ux -- (rmin*ux,(1.1)*uy);
for x = 0.5 step 0.05 until 1.1:
label.bot(textext(decimal(x)),(x*ux,x*uy));
you accumulate the rounding error with every step of the loop. try to avoid
such 'low value' steps if possible.
for x = 10 step 1 until 22: % 0.05*20 to get an integer loop index
tx := x/20; % correct value
label.bot(textext(decimal(tx)),(tx*ux,tx*uy));
Best wishes, Peter
endfor;
\stopuseMPgraphic
\useMPgraphic{labeltest}
\stoptext
I get (0.5,0.55, 0.6,0.65001,0.70001,0.75002,...,1.3) instead. I don't
understand why I get more than 2 digits after 0.6. Is there a way to
restrict the number of digits after the decimal point.
Thanks very much.
___
If your question is of interest to others as well, please add an entry to
the Wiki!
maillist : ntg-context@ntg.nl /
http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___
--
Es ist doch ein Trost,
das Geldgier manchmal blöd macht.
- Kottan in Kottan ermittelt, Folge 9: Die Einteilung -
___
If your question is of interest to others as well, please add an entry to
the Wiki!
maillist : ntg-context@ntg.nl /
http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___
___
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___
Re: [NTG-context] Metapost labeling question. Please help
Am 03.04.2009 um 14:47 schrieb Curiouslearn: Mojca and Peter, thanks very much for your responses. I used Peter's solution and it worked beautifully. Does anyone know how I can change the size of these labels? If I try textext(\tfa decimal(tx)) textext(\tfa decimal(tx)) Wolfgang ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Metapost labeling question. Please help
Beautiful! Thanks, Wolfgang. On Fri, Apr 3, 2009 at 9:35 AM, Wolfgang Schuster schuster.wolfg...@googlemail.com wrote: Am 03.04.2009 um 14:47 schrieb Curiouslearn: Mojca and Peter, thanks very much for your responses. I used Peter's solution and it worked beautifully. Does anyone know how I can change the size of these labels? If I try textext(\tfa decimal(tx)) textext(\tfa decimal(tx)) Wolfgang ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___ ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
[NTG-context] Metapost labeling question. Please help
Hi,
I want the labels as (0.5,0.55,0.6,0.65,0.7,...,1)
or (0.50,0.55,0.60,0.65,0.70,...,1). Either of these two is fine.
I tried the following code for this.
\starttext
\startuseMPgraphic{labeltest}
numeric rmin,rmax;
rmin := 0.5; rmax := 1;
ux := 25cm; uy :=10cm;
% draw axes
draw (rmin,0)*ux -- (rmax+0.1,0)*ux;
draw (rmin,0)*ux -- (rmin*ux,(1.1)*uy);
for x = 0.5 step 0.05 until 1.1:
label.bot(textext(decimal(x)),(x*ux,x*uy));
endfor;
\stopuseMPgraphic
\useMPgraphic{labeltest}
\stoptext
I get (0.5,0.55, 0.6,0.65001,0.70001,0.75002,...,1.3) instead. I don't
understand why I get more than 2 digits after 0.6. Is there a way to
restrict the number of digits after the decimal point.
Thanks very much.
___
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___
Re: [NTG-context] Metapost labeling question. Please help
On Fri, Apr 3, 2009 at 03:02, Curiouslearn wrote:
Hi,
I want the labels as (0.5,0.55,0.6,0.65,0.7,...,1)
or (0.50,0.55,0.60,0.65,0.70,...,1). Either of these two is fine.
I tried the following code for this.
\starttext
\startuseMPgraphic{labeltest}
numeric rmin,rmax;
rmin := 0.5; rmax := 1;
ux := 25cm; uy :=10cm;
% draw axes
draw (rmin,0)*ux -- (rmax+0.1,0)*ux;
draw (rmin,0)*ux -- (rmin*ux,(1.1)*uy);
for x = 0.5 step 0.05 until 1.1:
label.bot(textext(decimal(x)),(x*ux,x*uy));
endfor;
\stopuseMPgraphic
\useMPgraphic{labeltest}
\stoptext
I get (0.5,0.55, 0.6,0.65001,0.70001,0.75002,...,1.3) instead. I don't
understand why I get more than 2 digits after 0.6.
It's because you get exact numbers in the terms what metapost
considers exact (multiples of 2^{-something}). You have exactly the
same problem if you work with floating points with any other
programming language.
Is there a way to
restrict the number of digits after the decimal point.
Thanks very much.
See page 18 of metapost manual (speaking of metapost manual present in
TeX Live):
-
6.2 Operators
The length operator returns the number of characters in a string.
For substring construction, the ⟨of operator⟩ substring is used like this:
substring ⟨pair expression⟩ of ⟨string primary⟩
substring (2,4) of abcde is cd.
-
You can use substring (0,4) to truncate the number. 0.5 might need
special treatment, so you either need to concatenate it with 0 at the
end or you need to check the lenght of string before using substring.
Mojca
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Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
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