RuntimeError: LaTeX was not able to process the following string: 'z=$\\\\mathregular{{}^{}_{\\\\}}$' in matplotlib

I have been trying to generate `Latex` style plots for publication by  

```
from __future__ import unicode_literals
import matplotlib
import matplotlib.pyplot as plt
import matplotlib.colors as mplcol
import matplotlib.cm as cmx
import numpy as np
plt.switch_backend('PS') 
matplotlib.use('PS')
matplotlib.style.use('ggplot')
matplotlib.rcParams['axes.edgecolor']='black'
matplotlib.rcParams['axes.facecolor']= 'white'
matplotlib.rcParams['axes.grid']= False
matplotlib.rcParams['ytick.major.size']= 2
matplotlib.rcParams['ytick.minor.pad']= 0.05
matplotlib.rcParams['xtick.major.size']= 2
matplotlib.rcParams['xtick.minor.pad']= 0.25
matplotlib.rcParams['legend.frameon'] = False
matplotlib.rcParams['text.usetex']=True
matplotlib.rcParams['text.latex.unicode']=True
matplotlib.rcParams['ps.usedistiller']='xpdf'
matplotlib.rcParams['ps.distiller.res']= 9000
matplotlib.rcParams['savefig.dpi']= 500
value = "{" + str(round(r.value, 2)) + "}"
upper = "{+" + str(round(r.upper_error, 2)) + "}"
lower = "{\,-" + str(round(r.lower_error, 2)) + "}"
# format this in a format LaTeX can parse. Use mathregular so that the
# font is the same as all the other fonts on the plot.
ext = r"z=$\mathregular{{{value}^{upper}_{lower}}}$".format(
        value=value, upper=upper, lower=lower)
save_as_one_pdf(figures, params["plot_directory"] +
                    self.name+'.pdf' )
```

where I want to plot different figures in multiple pages with this function:

```
def save_as_one_pdf(figs, filename):
    """
    Save the figures into one long PDF file

    :param figs: list of figures to be saved as PDFs
    :param filename: place where the PDFs will be saved
    :return: none
    """

    # Save the pdfs as one file
    pp = PdfPages(filename)
    for fig in figs:
        pp.savefig(fig)
    pp.close()
    for fig in figs:
        plt.close(fig)
```

But when I ran my script I've got the following errors:

```
 File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/backends/backend_pdf.py", line 2431, in savefig
    figure.savefig(self, format='pdf', **kwargs)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/figure.py", line 1476, in savefig
    self.canvas.print_figure(*args, **kwargs)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/backend_bases.py", line 2211, in print_figure
    **kwargs)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/backends/backend_pdf.py", line 2485, in print_pdf
    self.figure.draw(renderer)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/figure.py", line 1085, in draw
    func(*args)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/axes/_base.py", line 2110, in draw
    a.draw(renderer)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/text.py", line 595, in draw
    bbox, info, descent = self._get_layout(renderer)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/text.py", line 320, in _get_layout
    ismath=ismath)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/backends/backend_pdf.py", line 2044, in get_text_width_height_descent
    renderer=self)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/texmanager.py", line 670, in get_text_width_height_descent
    dvifile = self.make_dvi(tex, fontsize)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/texmanager.py", line 417, in make_dvi
    report))
RuntimeError: LaTeX was not able to process the following string:
'z=$\\\\mathregular{{0.27}^{+0.01}_{\\\\,-0.01}}$'
Here is the full report generated by LaTeX: 

This is pdfTeX, Version 3.1415926-2.5-1.40.14 (TeX Live 2013/Debian)
 restricted \write18 enabled.
entering extended mode
(./384610b05118db25834f6dd15bc90717.tex
LaTeX2e <2011/06/27>
Babel <3.9h> and hyphenation patterns for 62 languages loaded.
(/usr/share/texlive/texmf-dist/tex/latex/base/article.cls
Document Class: article 2007/10/19 v1.4h Standard LaTeX document class
(/usr/share/texlive/texmf-dist/tex/latex/base/size10.clo))
(/usr/share/texlive/texmf-dist/tex/latex/type1cm/type1cm.sty)
(/usr/share/texlive/texmf-dist/tex/latex/psnfss/helvet.sty
(/usr/share/texlive/texmf-dist/tex/latex/graphics/keyval.sty))
(/usr/share/texlive/texmf-dist/tex/latex/psnfss/courier.sty)
(/usr/share/texlive/texmf-dist/tex/latex/base/textcomp.sty
(/usr/share/texlive/texmf-dist/tex/latex/base/ts1enc.def))
(/usr/share/texlive/texmf-dist/tex/latex/ucs/ucs.sty
(/usr/share/texlive/texmf-dist/tex/latex/ucs/data/uni-global.def))
(/usr/share/texlive/texmf-dist/tex/latex/base/inputenc.sty
(/usr/share/texlive/texmf-dist/tex/latex/ucs/utf8x.def))
(/usr/share/texlive/texmf-dist/tex/latex/geometry/geometry.sty
(/usr/share/texlive/texmf-dist/tex/generic/oberdiek/ifpdf.sty)
(/usr/share/texlive/texmf-dist/tex/generic/oberdiek/ifvtex.sty)
(/usr/share/texlive/texmf-dist/tex/generic/ifxetex/ifxetex.sty)

Package geometry Warning: Over-specification in `h'-direction.
    `width' (5058.9pt) is ignored.


Package geometry Warning: Over-specification in `v'-direction.
    `height' (5058.9pt) is ignored.

)
No file 384610b05118db25834f6dd15bc90717.aux.
(/usr/share/texlive/texmf-dist/tex/latex/base/ts1cmr.fd)
(/usr/share/texlive/texmf-dist/tex/latex/psnfss/ot1pnc.fd)
(/usr/share/texlive/texmf-dist/tex/latex/ucs/ucsencs.def)
*geometry* driver: auto-detecting
*geometry* detected driver: dvips
(/usr/share/texlive/texmf-dist/tex/latex/psnfss/ot1phv.fd)
! Undefined control sequence.
<recently read> \mathregular 

l.13 ...0000}{12.500000}{\sffamily z=$\mathregular
                                                  {{0.27}^{+0.01}_{\,-0.01}}$}
[1] (./384610b05118db25834f6dd15bc90717.aux) )
(see the transcript file for additional information)
```

even after I changed the text to
    text = r"z=${value}^{upper}_{lower}$".format(
            value=value, upper=upper, lower=lower)

I've got the following error:

```
 File "cluster.py", line 762, in save_as_one_pdf
    pp.savefig(fig)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/backends/backend_pdf.py", line 2431, in savefig
    figure.savefig(self, format='pdf', **kwargs)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/figure.py", line 1476, in savefig
    self.canvas.print_figure(*args, **kwargs)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/backend_bases.py", line 2211, in     print_figure
**kwargs)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/backends/backend_pdf.py", line 2485, in print_pdf
    self.figure.draw(renderer)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/artist.py", line 59, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/figure.py", line 1085, in draw
func(*args)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/axes/_base.py", line 2110, in draw
a.draw(renderer)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/axis.py", line 1116, in draw
renderer)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/axis.py", line 1065, in _get_tick_bboxes
extent = tick.label1.get_window_extent(renderer)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/text.py", line 798, in get_window_extent
    bbox, info, descent = self._get_layout(self._renderer)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/text.py", line 311, in _get_layout
ismath=False)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/backends/backend_pdf.py", line 2044, in get_text_width_height_descent
renderer=self)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/texmanager.py", line 670, in get_text_width_height_descent
dvifile = self.make_dvi(tex, fontsize)
  File "/vol/anaconda/lib/python2.7/site-packages/matplotlib/texmanager.py", line 417, in make_dvi
report))
RuntimeError: LaTeX was not able to process the following string:
'lp'
Here is the full report generated by LaTeX: 

! Package unicode-math Error: Cannot be run with pdfLaTeX!
(unicode-math)                Use XeLaTeX or LuaLaTeX instead..

See the unicode-math package documentation for explanation.
Type  H <return>  for immediate help.
```

How can I make this all work or avoid this error?


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RuntimeError: LaTeX was not able to process the following string: 'z=$\\\\mathregular{{}^{}_{\\\\}}$' in matplotlib #5076

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RuntimeError: LaTeX was not able to process the following string: 'z=$\\\\mathregular{{}^{}_{\\\\}}$' in matplotlib #5076

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