# automatic list of r'$2$'...

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 hii try this :'''Lx,x,Ly,y=[],xmin,[],yminLrx,Lry=[],[]while (x<=xmax):    Lx.append(x)    Lrx.append("$".join(["r'",str(x),"'"])) x+=1while (y<=ymax): Ly.append(y) y+=1'''but it creates a Lrx list like this :["r'$-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'$2.5$']i guess that r is an operator to deal with the$..$expressions but not understand how to fix my definitionthanks for your helpVincent –––––––––––––––––––––––––– Vincent Douce :=: Mathoscope :=: 06°13°11°07°26 Bagnères de Bigorre 65200 _______________________________________________ Matplotlib-users mailing list [hidden email] https://mail.python.org/mailman/listinfo/matplotlib-users –––––––––––––––––––––––––– Vincent Douce :=: Mathoscope :=: http://mathoscope.xyz 06°13°11°07°26 Bagnères de Bigorre 65200 Reply | Threaded Open this post in threaded view | ## Re: automatic list of r'$2$'...  Well, isn't  Lx = np.arange(xmin, xmax + 1) Lrx = [r"${}$".format(val) for val in Lx] # aka 'list comprehension'  producing what you are looking for? Adrien PS: in the long term, another (more global) approach might be to leverage Matplotlib's formatting capabilities like the ones introduced here: http://matplotlib.org/gallery/ticks_and_spines/tick-formatters.htmlor https://matplotlib.org/tutorials/text/usetex.htmland then simply define the ticks (meaning their value) that you want. On 12/13/2017 10:52 AM, Vincent Douce Mathoscope wrote: > 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'$2.5$'] > > i guess that r is an operator to deal with the $..$ expressions but not > understand how to fix my definition > > thanks for your help > > Vincent > >          –––––––––––––––––––––––––– >                    Vincent Douce >                 :=: Mathoscope :=: > http://mathoscope.xyz>                   06°13°11°07°26 >            Bagnères de Bigorre 65200 > > > > > > > _______________________________________________ > Matplotlib-users mailing list > [hidden email] > https://mail.python.org/mailman/listinfo/matplotlib-users> _______________________________________________ Matplotlib-users mailing list [hidden email] https://mail.python.org/mailman/listinfo/matplotlib-users
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## Re: automatic list of r'$2$'...

 In reply to this post by vincent_mathoscope 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. _______________________________________________ Matplotlib-users mailing list [hidden email] https://mail.python.org/mailman/listinfo/matplotlib-users
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## Re: automatic list of r'$2$'...

 thanks Fabrice the problems seems to be : i get for Lrx : '$0', '$1', '$2' instead of r'$0', r'$1', r'$2' the "r" disappears as the r is not in the chain is seems not to be considered by python as an element to keep ? Vincent > Le 13 déc. 2017 à 20:42, Fabrice Silva <[hidden email]> a écrit : > > Le mercredi 13 décembre 2017, Vincent Douce Mathoscope a écrit : >> hi >> i try this : >> ''' >> Lx,x,Ly,y=[],xmin,[],ymin >> Lrx,Lry=[],[] >> while (x<=xmax): >>    Lx.append(x) >>    Lrx.append("$".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. > > > _______________________________________________ > Matplotlib-users mailing list > [hidden email] > https://mail.python.org/mailman/listinfo/matplotlib-users        ––––––––––––––––––––––––––                   Vincent Douce                :=: Mathoscope :=:              http://mathoscope.xyz                 06°13°11°07°26           Bagnères de Bigorre 65200 _______________________________________________ Matplotlib-users mailing list [hidden email] https://mail.python.org/mailman/listinfo/matplotlib-users         ––––––––––––––––––––––––––                   Vincent Douce                :=: Mathoscope :=:              http://mathoscope.xyz                 06°13°11°07°26           Bagnères de Bigorre 65200
## Re: automatic list of r'$2$'...
 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'$2' the "r" disappears as the r is not in the chain is seems not to be considered by python as an element to keep ? Vincent  Le 13 déc. 2017 à 20:42, Fabrice Silva [hidden email] a écrit : Le mercredi 13 décembre 2017, Vincent Douce Mathoscope a écrit :  hi i try this : ''' Lx,x,Ly,y=[],xmin,[],ymin Lrx,Lry=[],[] while (x<=xmax): Lx.append(x) Lrx.append("$".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. _______________________________________________ Matplotlib-users mailing list [hidden email] https://mail.python.org/mailman/listinfo/matplotlib-users   –––––––––––––––––––––––––– Vincent Douce :=: Mathoscope :=: http://mathoscope.xyz 06°13°11°07°26 Bagnères de Bigorre 65200 _______________________________________________ Matplotlib-users mailing list [hidden email] https://mail.python.org/mailman/listinfo/matplotlib-users  -- Christophe BAL Enseignant Agrégé de Mathématiques Programmeur Python Amateur _______________________________________________ Matplotlib-users mailing list [hidden email] https://mail.python.org/mailman/listinfo/matplotlib-users
## Re: automatic list of r'$2$'...
 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 "$" " "h" "e" "t" "a" "$" ' 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) <[hidden email]> 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'$2' the "r" disappears as the r is not in the chain is seems not to be considered by python as an element to keep ? Vincent  Le 13 déc. 2017 à 20:42, Fabrice Silva [hidden email] a écrit : Le mercredi 13 décembre 2017, Vincent Douce Mathoscope a écrit :  hi i try this : ''' Lx,x,Ly,y=[],xmin,[],ymin Lrx,Lry=[],[] while (x<=xmax): Lx.append(x) Lrx.append("$".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. _______________________________________________ Matplotlib-users mailing list [hidden email] https://mail.python.org/mailman/listinfo/matplotlib-users   –––––––––––––––––––––––––– Vincent Douce :=: Mathoscope :=: http://mathoscope.xyz 06°13°11°07°26 Bagnères de Bigorre 65200 _______________________________________________ Matplotlib-users mailing list [hidden email] https://mail.python.org/mailman/listinfo/matplotlib-users  -- Christophe BAL Enseignant Agrégé de Mathématiques Programmeur Python Amateur` _______________________________________________ Matplotlib-users mailing list [hidden email] https://mail.python.org/mailman/listinfo/matplotlib-users _______________________________________________ Matplotlib-users mailing list [hidden email] https://mail.python.org/mailman/listinfo/matplotlib-users