[Matplotlib-users] automatic list of r'$2$'...

[Thomas Caswell]

The 'r' prefix tells python to not try an interpret any escape sequences
(such at \t for 'tab' and '\n' for a new line) as escape sequences.  This
is part of the core python language, not Matplotlib or latex specific!

 If you did not use raw string and wanted to use θ (theta) as '$\theta$`
python would go 'Ah ha! they asked for the string "$" "<TAB> "h" "e" "t"
"a" "$" ' which is not what you wanted.  To get around this you can either
do "$\\theta$" or r"$\theta$.

Using raw strings is probably the better option as future versions of
python will fail on unknown escape sequences so _every_ \ in your latex
would have to be \\.

Tom

On Sat, Dec 23, 2017 at 4:39 PM Christophe BAL (via GMAIL) <
projetmbc at gmail.com> wrote:

> Hello.
>
>
> One question: why do you use raw strings ?
>
>
> One suggestion: with Python 3.6, you can use  *fr"${x}$"*  or simply
> *f"${x}$"*  if you don't really need raw strings.
>
> Le 23/12/2017 à 22:01, Vincent Douce Mathoscope a écrit :
>
> thanks Fabrice
> the problems seems to be :
> i get for Lrx :
> '$0', '$1', '$2'
> instead of
> r'$0', r'$1', r'$2'
> the "r" disappears
> as the r is not in the chain is seems not to be considered by python as an element to keep ?
> Vincent
>
>
> Le 13 déc. 2017 à 20:42, Fabrice Silva <silva at lma.cnrs-mrs.fr> <silva at lma.cnrs-mrs.fr> a écrit :
>
> Le mercredi 13 décembre 2017, Vincent Douce Mathoscope a écrit :
>
> hi
> i try this :
> '''
> Lx,x,Ly,y=[],xmin,[],ymin
> Lrx,Lry=[],[]
> while (x<=xmax):
>    Lx.append(x)
>    Lrx.append("$".join(["r'",str(x),"'"]))
>    x+=1
> while (y<=ymax):
>    Ly.append(y)
>    y+=1
> '''
> but it creates a Lrx list like this :
> ["r'$-2.5$'", "r'$-1.5$'", "r'$-0.5$'", "r'$0.5$'", "r'$1.5$'",
> "r'$2.5$'"]
> and i want to obtain
> [r'$-2.5$', r'$-1.5$', r'$-0.5$', r'$0.5$', r'$1.5$', r'$2.5$']
>
>
> My suggestion
>
> import numpy as np
> tmpx = [(x, r'$%s' % x) for x in np.arange(xmin, xmax, 1)]
> Lx, Lrx = zip(*tmpx)
>
> Idem for the y stuff.
> If you prefer to keep the while loop, change the Lrx line to
> Lrx.append(r"$%s$" %x)
> or
> Lrx.append(r"${}$".format(x))
> Note that you can add format specification in both solutions.
>
>
> _______________________________________________
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>
>
>         ––––––––––––––––––––––––––
>                   Vincent Douce
>                :=: Mathoscope :=:
>              http://mathoscope.xyz
>                  06°13°11°07°26
>           Bagnères de Bigorre 65200
>
>
>
>
>
> _______________________________________________
> Matplotlib-users mailing listMatplotlib-users at python.orghttps://mail.python.org/mailman/listinfo/matplotlib-users
>
>
> --
> Christophe BAL
> Enseignant Agrégé de Mathématiques
> Programmeur Python Amateur
>
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