How can I format a float using matplotlib's LaTeX formatter?

Question

I have a number in my python script that I want to use as part of the title of a plot in matplotlib. Is there a function that converts a float to a formatted TeX string?

Answer 1

You can do something like:

ax.set_title( "${0} \\times 10^{{{1}}}$".format('3.5','+20'))

in the old style:

ax.set_title( "$%s \\times 10^{%s}$" % ('3.5','+20'))

Answer 2

Install the num2tex package:

pip install num2tex

and format your title as:

ax.set_title('${}$'.format(num2tex(3.5e20)))

or use the _repr_latex_() method:

ax.set_title(num2tex(3.5e20)._repr_latex_())

which will give you the same thing.

num2tex inherits from str so the format function can be used as you would use it for a string:

ax.set_title('${:.2e}$'.format(num2tex(3.5e20)))

Disclaimer: I (very recently) created num2tex. It works well for my workflow and I am now trying to get feedback from others who might be interested in using it.

Answer 3

With old stype formatting:

print r'$%s \times 10^{%s}$' % tuple('3.5e+20'.split('e+'))

with new format:

print r'${} \times 10^{{{}}}$'.format(*'3.5e+20'.split('e+'))