Failed to process string with tex because latex could not be found

[arre-ankit]

**I would like to fix this error please assign me this error **

RuntimeError: Failed to process string with tex because latex could not be found

In the code follows : https://github.com/maziarraissi/PINNs/blob/master/appendix/continuous_time_identification%20(Burgers)/Burgers.py#L224-L288

` ######################################################################
############################# Plotting ###############################
######################################################################

fig, ax = newfig(1.0, 1.4)
ax.axis('off')

####### Row 0: u(t,x) ##################    
gs0 = gridspec.GridSpec(1, 2)
gs0.update(top=1-0.06, bottom=1-1.0/3.0+0.06, left=0.15, right=0.85, wspace=0)
ax = plt.subplot(gs0[:, :])

h = ax.imshow(U_pred.T, interpolation='nearest', cmap='rainbow', 
              extent=[t.min(), t.max(), x.min(), x.max()], 
              origin='lower', aspect='auto')
divider = make_axes_locatable(ax)
cax = divider.append_axes("right", size="5%", pad=0.05)
fig.colorbar(h, cax=cax)

ax.plot(X_u_train[:,1], X_u_train[:,0], 'kx', label = 'Data (%d points)' % (u_train.shape[0]), markersize = 2, clip_on = False)

line = np.linspace(x.min(), x.max(), 2)[:,None]
ax.plot(t[25]*np.ones((2,1)), line, 'w-', linewidth = 1)
ax.plot(t[50]*np.ones((2,1)), line, 'w-', linewidth = 1)
ax.plot(t[75]*np.ones((2,1)), line, 'w-', linewidth = 1)

ax.set_xlabel('$t$')
ax.set_ylabel('$x$')
ax.legend(loc='upper center', bbox_to_anchor=(1.0, -0.125), ncol=5, frameon=False)
ax.set_title('$u(t,x)$', fontsize = 10)

####### Row 1: u(t,x) slices ##################    
gs1 = gridspec.GridSpec(1, 3)
gs1.update(top=1-1.0/3.0-0.1, bottom=1.0-2.0/3.0, left=0.1, right=0.9, wspace=0.5)

ax = plt.subplot(gs1[0, 0])
ax.plot(x,Exact[25,:], 'b-', linewidth = 2, label = 'Exact')       
ax.plot(x,U_pred[25,:], 'r--', linewidth = 2, label = 'Prediction')
ax.set_xlabel('$x$')
ax.set_ylabel('$u(t,x)$')    
ax.set_title('$t = 0.25$', fontsize = 10)
ax.axis('square')
ax.set_xlim([-1.1,1.1])
ax.set_ylim([-1.1,1.1])

ax = plt.subplot(gs1[0, 1])
ax.plot(x,Exact[50,:], 'b-', linewidth = 2, label = 'Exact')       
ax.plot(x,U_pred[50,:], 'r--', linewidth = 2, label = 'Prediction')
ax.set_xlabel('$x$')
ax.set_ylabel('$u(t,x)$')
ax.axis('square')
ax.set_xlim([-1.1,1.1])
ax.set_ylim([-1.1,1.1])
ax.set_title('$t = 0.50$', fontsize = 10)
ax.legend(loc='upper center', bbox_to_anchor=(0.5, -0.35), ncol=5, frameon=False)

ax = plt.subplot(gs1[0, 2])
ax.plot(x,Exact[75,:], 'b-', linewidth = 2, label = 'Exact')       
ax.plot(x,U_pred[75,:], 'r--', linewidth = 2, label = 'Prediction')
ax.set_xlabel('$x$')
ax.set_ylabel('$u(t,x)$')
ax.axis('square')
ax.set_xlim([-1.1,1.1])
ax.set_ylim([-1.1,1.1])    
ax.set_title('$t = 0.75$', fontsize = 10)
`

I am getting the error :

`Text(0.5, 1.0, '$t = 0.75$')

FileNotFoundError Traceback (most recent call last)
~\anaconda3\envs\xyz\lib\site-packages\matplotlib\texmanager.py in _run_checked_subprocess(self, command, tex)
276 cwd=self.texcache,
--> 277 stderr=subprocess.STDOUT)
278 except FileNotFoundError as exc:

~\anaconda3\envs\xyz\lib\subprocess.py in check_output(timeout, *popenargs, **kwargs)
355 return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
--> 356 **kwargs).stdout
357

~\anaconda3\envs\xyz\lib\subprocess.py in run(input, timeout, check, *popenargs, **kwargs)
422
--> 423 with Popen(*popenargs, **kwargs) as process:
424 try:

~\anaconda3\envs\xyz\lib\subprocess.py in init(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags, restore_signals, start_new_session, pass_fds, encoding, errors)
728 errread, errwrite,
--> 729 restore_signals, start_new_session)
730 except:

~\anaconda3\envs\xyz\lib\subprocess.py in _execute_child(self, args, executable, preexec_fn, close_fds, pass_fds, cwd, env, startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite, unused_restore_signals, unused_start_new_session)
1016 os.fspath(cwd) if cwd is not None else None,
-> 1017 startupinfo)
1018 finally:

FileNotFoundError: [WinError 2] The system cannot find the file specified

The above exception was the direct cause of the following exception:

RuntimeError Traceback (most recent call last)
~\anaconda3\envs\xyz\lib\site-packages\IPython\core\formatters.py in call(self, obj)
339 pass
340 else:
--> 341 return printer(obj)
342 # Finally look for special method names
343 method = get_real_method(obj, self.print_method)

~\anaconda3\envs\xyz\lib\site-packages\IPython\core\pylabtools.py in (fig)
246
247 if 'png' in formats:
--> 248 png_formatter.for_type(Figure, lambda fig: print_figure(fig, 'png', **kwargs))
249 if 'retina' in formats or 'png2x' in formats:
250 png_formatter.for_type(Figure, lambda fig: retina_figure(fig, **kwargs))

~\anaconda3\envs\xyz\lib\site-packages\IPython\core\pylabtools.py in print_figure(fig, fmt, bbox_inches, **kwargs)
130 FigureCanvasBase(fig)
131
--> 132 fig.canvas.print_figure(bytes_io, **kw)
133 data = bytes_io.getvalue()
134 if fmt == 'svg':

~\anaconda3\envs\xyz\lib\site-packages\matplotlib\backend_bases.py in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, bbox_inches, pad_inches, bbox_extra_artists, backend, **kwargs)
2191 else suppress())
2192 with ctx:
-> 2193 self.figure.draw(renderer)
2194
2195 bbox_inches = self.figure.get_tightbbox(

~\anaconda3\envs\xyz\lib\site-packages\matplotlib\artist.py in draw_wrapper(artist, renderer, *args, **kwargs)
39 renderer.start_filter()
40
---> 41 return draw(artist, renderer, *args, **kwargs)
42 finally:
43 if artist.get_agg_filter() is not None:

~\anaconda3\envs\xyz\lib\site-packages\matplotlib\figure.py in draw(self, renderer)
1862 self.patch.draw(renderer)
1863 mimage._draw_list_compositing_images(
-> 1864 renderer, self, artists, self.suppressComposite)
1865
1866 renderer.close_group('figure')

~\anaconda3\envs\xyz\lib\site-packages\matplotlib\image.py in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)
129 if not_composite or not has_images:
130 for a in artists:
--> 131 a.draw(renderer)
132 else:
133 # Composite any adjacent images together

~\anaconda3\envs\xyz\lib\site-packages\matplotlib\artist.py in draw_wrapper(artist, renderer, *args, **kwargs)
39 renderer.start_filter()
40
---> 41 return draw(artist, renderer, *args, **kwargs)
42 finally:
43 if artist.get_agg_filter() is not None:

~\anaconda3\envs\xyz\lib\site-packages\matplotlib\cbook\deprecation.py in wrapper(*inner_args, **inner_kwargs)
409 else deprecation_addendum,
410 **kwargs)
--> 411 return func(*inner_args, **inner_kwargs)
412
413 return wrapper

~\anaconda3\envs\xyz\lib\site-packages\matplotlib\axes_base.py in draw(self, renderer, inframe)
2705 artists.remove(spine)
2706
-> 2707 self._update_title_position(renderer)
2708
2709 if not self.axison or inframe:

~\anaconda3\envs\xyz\lib\site-packages\matplotlib\axes_base.py in _update_title_position(self, renderer)
2646 _log.debug('top of axes not in the figure, so title not moved')
2647 return
-> 2648 if title.get_window_extent(renderer).ymin < top:
2649 _, y = self.transAxes.inverted().transform((0, top))
2650 title.set_position((x, y))

~\anaconda3\envs\xyz\lib\site-packages\matplotlib\text.py in get_window_extent(self, renderer, dpi)
900
901 with cbook._setattr_cm(self.figure, dpi=dpi):
--> 902 bbox, info, descent = self._get_layout(self._renderer)
903 x, y = self.get_unitless_position()
904 x, y = self.get_transform().transform((x, y))

~\anaconda3\envs\xyz\lib\site-packages\matplotlib\text.py in _get_layout(self, renderer)
287 _, lp_h, lp_d = renderer.get_text_width_height_descent(
288 "lp", self._fontproperties,
--> 289 ismath="TeX" if self.get_usetex() else False)
290 min_dy = (lp_h - lp_d) * self._linespacing
291

~\anaconda3\envs\xyz\lib\site-packages\matplotlib\backends\backend_agg.py in get_text_width_height_descent(self, s, prop, ismath)
226 fontsize = prop.get_size_in_points()
227 w, h, d = texmanager.get_text_width_height_descent(
--> 228 s, fontsize, renderer=self)
229 return w, h, d
230

~\anaconda3\envs\xyz\lib\site-packages\matplotlib\texmanager.py in get_text_width_height_descent(self, tex, fontsize, renderer)
421 else:
422 # use dviread.
--> 423 dvifile = self.make_dvi(tex, fontsize)
424 with dviread.Dvi(dvifile, 72 * dpi_fraction) as dvi:
425 page, = dvi

~\anaconda3\envs\xyz\lib\site-packages\matplotlib\texmanager.py in make_dvi(self, tex, fontsize)
309 self._run_checked_subprocess(
310 ["latex", "-interaction=nonstopmode", "--halt-on-error",
--> 311 texfile], tex)
312 for fname in glob.glob(basefile + '*'):
313 if not fname.endswith(('dvi', 'tex')):

~\anaconda3\envs\xyz\lib\site-packages\matplotlib\texmanager.py in _run_checked_subprocess(self, command, tex)
279 raise RuntimeError(
280 'Failed to process string with tex because {} could not be '
--> 281 'found'.format(command[0])) from exc
282 except subprocess.CalledProcessError as exc:
283 raise RuntimeError(

RuntimeError: Failed to process string with tex because latex could not be found

`

This error can be fixed by changing the code of Utilities : https://github.com/maziarraissi/PINNs/tree/master/Utilities

[RoboticAutonomy]

you can modify this line in plotting.py:

"pgf.preamble": r"\usepackage[utf8x]{inputenc} \usepackage[T1]{fontenc}",