Matplotlib上的Latex未被识别为字符串

plt.subplot(1,2,1) plt.hist(t_single, bins, rwidth= 0.8, normed= True) plt.plot(supp, gaussian, 'red') plt.title(r'Single-selection Estimator ($c_y = $' + str(cy) + ', $c_d = $' + str (cd) + ', $\alpha_0 = $' + str(alpha_0) + ')', fontsize = 16) plt.legend(['Gaussian', 'Estimator'], loc = 'best', fontsize = 14) plt.ylabel('Frequency', fontsize = 14) plt.xlabel('t-statistic', fontsize = 14)

ParseException Traceback (most recent call last) ~/anaconda3/lib/python3.6/site-packages/matplotlib/mathtext.py in parse(self, s, fonts_object, fontsize, dpi) 2515 try: -> 2516 result = self._expression.parseString(s) 2517 except ParseBaseException as err: ~/anaconda3/lib/python3.6/site-packages/pyparsing.py in parseString(self, instring, parseAll) 1631 # catch and re-raise exception from here, clears out pyparsing internal stack trace -> 1632 raise exc 1633 else: ~/anaconda3/lib/python3.6/site-packages/pyparsing.py in parseString(self, instring, parseAll) 1621 try: -> 1622 loc, tokens = self._parse( instring, 0 ) 1623 if parseAll: ~/anaconda3/lib/python3.6/site-packages/pyparsing.py in _parseCache(self, instring, loc, doActions, callPreParse) 1528 try: -> 1529 value = self._parseNoCache(instring, loc, doActions, callPreParse) 1530 except ParseBaseException as pe: ~/anaconda3/lib/python3.6/site-packages/pyparsing.py in _parseNoCache(self, instring, loc, doActions, callPreParse) 1378 try: -> 1379 loc,tokens = self.parseImpl( instring, preloc, doActions ) 1380 except IndexError: ~/anaconda3/lib/python3.6/site-packages/pyparsing.py in parseImpl(self, instring, loc, doActions) 3716 if self.expr is not None: -> 3717 return self.expr._parse( instring, loc, doActions, callPreParse=False ) 3718 else: ~/anaconda3/lib/python3.6/site-packages/pyparsing.py in _parseCache(self, instring, loc, doActions, callPreParse) 1528 try: -> 1529 value = self._parseNoCache(instring, loc, doActions, callPreParse) 1530 except ParseBaseException as pe: ~/anaconda3/lib/python3.6/site-packages/pyparsing.py in _parseNoCache(self, instring, loc, doActions, callPreParse) 1378 try: -> 1379 loc,tokens = self.parseImpl( instring, preloc, doActions ) 1380 except IndexError: ~/anaconda3/lib/python3.6/site-packages/pyparsing.py in parseImpl(self, instring, loc, doActions) 3394 else: -> 3395 loc, exprtokens = e._parse( instring, loc, doActions ) 3396 if exprtokens or exprtokens.haskeys(): ~/anaconda3/lib/python3.6/site-packages/pyparsing.py in _parseCache(self, instring, loc, doActions, callPreParse) 1528 try: -> 1529 value = self._parseNoCache(instring, loc, doActions, callPreParse) 1530 except ParseBaseException as pe: ~/anaconda3/lib/python3.6/site-packages/pyparsing.py in _parseNoCache(self, instring, loc, doActions, callPreParse) 1382 else: -> 1383 loc,tokens = self.parseImpl( instring, preloc, doActions ) 1384 ~/anaconda3/lib/python3.6/site-packages/pyparsing.py in parseImpl(self, instring, loc, doActions) 3182 if loc < len(instring): -> 3183 raise ParseException(instring, loc, self.errmsg, self) 3184 elif loc == len(instring): ParseException: Expected end of text (at char 50), (line:1, col:51) During handling of the above exception, another exception occurred: ValueError Traceback (most recent call last) ~/Google Drive/Mestrado/Tese/Code/Belloni_simulations/sim_plotter.py in <module>() 59 folder = 'alpha_' + str(alpha_0) + '/' 60 figname = 'single_vs_double_cy_' + str(cy) + '_cd_' + str(cd) + '_alpha' + str(alpha_0) + '.png' ---> 61 plt.savefig(folder + figname, bbox_inches = 'tight', dpi = 300) 62 63 ~/anaconda3/lib/python3.6/site-packages/matplotlib/pyplot.py in savefig(*args, **kwargs) 699 def savefig(*args, **kwargs): 700 fig = gcf() --> 701 res = fig.savefig(*args, **kwargs) 702 fig.canvas.draw_idle() # need this if 'transparent=True' to reset colors 703 return res ~/anaconda3/lib/python3.6/site-packages/matplotlib/figure.py in savefig(self, fname, **kwargs) 1832 self.set_frameon(frameon) 1833 -> 1834 self.canvas.print_figure(fname, **kwargs) 1835 1836 if frameon: ~/anaconda3/lib/python3.6/site-packages/matplotlib/backend_bases.py in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, **kwargs) 2214 orientation=orientation, 2215 dryrun=True, -> 2216 **kwargs) 2217 renderer = self.figure._cachedRenderer 2218 bbox_inches = self.figure.get_tightbbox(renderer) ~/anaconda3/lib/python3.6/site-packages/matplotlib/backends/backend_agg.py in print_png(self, filename_or_obj, *args, **kwargs) 505 506 def print_png(self, filename_or_obj, *args, **kwargs): --> 507 FigureCanvasAgg.draw(self) 508 renderer = self.get_renderer() 509 original_dpi = renderer.dpi ~/anaconda3/lib/python3.6/site-packages/matplotlib/backends/backend_agg.py in draw(self) 428 # if toolbar: 429 # toolbar.set_cursor(cursors.WAIT) --> 430 self.figure.draw(self.renderer) 431 finally: 432 # if toolbar: ~/anaconda3/lib/python3.6/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs) 53 renderer.start_filter() 54 ---> 55 return draw(artist, renderer, *args, **kwargs) 56 finally: 57 if artist.get_agg_filter() is not None: ~/anaconda3/lib/python3.6/site-packages/matplotlib/figure.py in draw(self, renderer) 1297 1298 mimage._draw_list_compositing_images( -> 1299 renderer, self, artists, self.suppressComposite) 1300 1301 renderer.close_group('figure') ~/anaconda3/lib/python3.6/site-packages/matplotlib/image.py in _draw_list_compositing_images(renderer, parent, artists, suppress_composite) 136 if not_composite or not has_images: 137 for a in artists: --> 138 a.draw(renderer) 139 else: 140 # Composite any adjacent images together ~/anaconda3/lib/python3.6/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs) 53 renderer.start_filter() 54 ---> 55 return draw(artist, renderer, *args, **kwargs) 56 finally: 57 if artist.get_agg_filter() is not None: ~/anaconda3/lib/python3.6/site-packages/matplotlib/axes/_base.py in draw(self, renderer, inframe) 2435 renderer.stop_rasterizing() 2436 -> 2437 mimage._draw_list_compositing_images(renderer, self, artists) 2438 2439 renderer.close_group('axes') ~/anaconda3/lib/python3.6/site-packages/matplotlib/image.py in _draw_list_compositing_images(renderer, parent, artists, suppress_composite) 136 if not_composite or not has_images: 137 for a in artists: --> 138 a.draw(renderer) 139 else: 140 # Composite any adjacent images together ~/anaconda3/lib/python3.6/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs) 53 renderer.start_filter() 54 ---> 55 return draw(artist, renderer, *args, **kwargs) 56 finally: 57 if artist.get_agg_filter() is not None: ~/anaconda3/lib/python3.6/site-packages/matplotlib/text.py in draw(self, renderer) 713 714 with _wrap_text(self) as textobj: --> 715 bbox, info, descent = textobj._get_layout(renderer) 716 trans = textobj.get_transform() 717 ~/anaconda3/lib/python3.6/site-packages/matplotlib/text.py in _get_layout(self, renderer) 315 w, h, d = renderer.get_text_width_height_descent(clean_line, 316 self._fontproperties, --> 317 ismath=ismath) 318 else: 319 w, h, d = 0, 0, 0 ~/anaconda3/lib/python3.6/site-packages/matplotlib/backends/backend_agg.py in get_text_width_height_descent(self, s, prop, ismath) 229 if ismath: 230 ox, oy, width, height, descent, fonts, used_characters = \ --> 231 self.mathtext_parser.parse(s, self.dpi, prop) 232 return width, height, descent 233 ~/anaconda3/lib/python3.6/site-packages/matplotlib/mathtext.py in parse(self, s, dpi, prop) 3301 self.__class__._parser = Parser() 3302 -> 3303 box = self._parser.parse(s, font_output, fontsize, dpi) 3304 font_output.set_canvas_size(box.width, box.height, box.depth) 3305 result = font_output.get_results(box) ~/anaconda3/lib/python3.6/site-packages/matplotlib/mathtext.py in parse(self, s, fonts_object, fontsize, dpi) 2520 err.line, 2521 " " * (err.column - 1) + "^", -> 2522 six.text_type(err)])) 2523 self._state_stack = None 2524 self._em_width_cache = {} ValueError: Single-selection Estimator ($c_y = $1, $c_d = $1, $lpha_0 = $0.5) ^ Expected end of text (at char 50), (line:1, col:51)

2条回答

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1楼 · 编辑于 2024-09-29 01:29:13

\a是一个ASCII铃声。您可以只使用原始字符串，这样Python就不会以这种特殊的方式来解释它：

... + r', $\alpha_0 = $' + ...

网友

2楼 · 编辑于 2024-09-29 01:29:13

在matplotlib中连接包含latex的字符串时，仅将'r'放在第一个字符串的开头是不够的，它需要在连接的每个字符串之前（例如，包含'$c_d = $'的latex命令的字符串不需要这样做）。改变

plt.title(r'Single-selection Estimator ($c_y = $' + str(cy) + ', $c_d = $' + 
str (cd) + ', $\alpha_0 = $' + str(alpha_0) + ')', fontsize = 16)

至

plt.title(r'Single-selection Estimator ($c_y = $' + str(cy) + ', $c_d = $' + 
str (cd) + r', $\alpha_0 = $' + str(alpha_0) + ')', fontsize = 16)

这个问题应该得到解决。这是因为只有第一个字符串被解释为raw，所有连接的后续字符串都没有被解释为raw。你知道吗

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