如何将十次方的字符串绘制为指数？

Question

I want to plot a scientific title or legend label which is e^(x*10**b).

Here's an example:

import matplotlib.pyplot as plt

data = 5.55e10

plt.title('e$^{%.2e}$'%(data))

And, the actual output is:

The preferred output is:

Answer 1

Split the formatted string and format them again:

>>> val = 5.55e10
>>> base, power = f'{val:.2e}'.split('e')
>>> f'e$^{{{base}*10^{{{power}}}}}$'
'e$^{5.55*10^{+10}}$'

Output in matplotlib:

Answer 2

Using a regex:

import matplotlib.pyplot as plt
import re

data = 5.55e10

s = re.sub(r'e([+-]\d+)', r'\\cdot{}10^{\1}', f'e$^{{{data:.2e}}}$')

plt.title(s)

output:

Answer 3

you can do that by extracting the base and exp:

import matplotlib.pyplot as plt
from math import log10, floor



def find_exp_base(number):
    exp = floor(log10(abs(number)))
    return round(number/10**exp, 2), exp 

    
data = 5.55e10
base, exp = find_exp_base(data)

plt.title('e$^{' + str(base) + '*10^{'+ str(exp) + '}}$')
plt.show()

output :