CODEWITHSUNDEEP
pythonnumpymatplotlib
Badrul Hasan Tanjil
Badrul Hasan Tanjil

Reputation: 35

My code shows invalid literal for float()

This is my code in editor:

import matplotlib.pyplot as plt

import numpy as np

x,y = np.loadtxt('D:\Tanjil\Python\directory\Matplot_trial1.csv',
                 unpack=True , delimiter='\s')

plt.plot(x,y,'r',label='angle=30 Degree'),

plt.ylabel('Power Input (kW)'),

plt.xlabel('Speed(rpm)'),

plt.axis([750.0, 1400.0, 3.3,3.8])

plt.title('Power Input vs. Speed curve')

plt.legend()

plt.show()

then it shows this:

  File "<ipython-input-19-abec5f4efd27>", line 6, in <module>
    unpack=True , delimiter='\s')

  File "C:\Users\bad_tanjil\Anaconda\lib\site-packages\numpy\lib\npyio.py", line 860, in loadtxt
    items = [conv(val) for (conv, val) in zip(converters, vals)]

ValueError: invalid literal for float(): 1350,3.64

Upvotes: 0

Views: 294

Answers (2)

mata
mata

Reputation: 69022

You're trying to read a csv document with delimiter='\s', but the dcument contains 1350,3.64 somewhere, which are two numbers clearly not whitespace separated. Check your csv, the error originates from there. If it's comma separated, use delimiter=','.

Also, \s doesn't mean whitespace separated, it means separated by a literal \s, whitespace separated is the default when you don't set a delimiter.

Upvotes: 1

Chr
Chr

Reputation: 965

You should call plt.axis() with a list of integers like this :

plt.axis([750, 1400, 3, 4])

Upvotes: 1

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