numpy.loadtxt -> could not convert string to float: '-0,0118'-CodePudding

When I try to run this code:

x,y = np.genfromtxt('Diode_A_Upcd.txt', unpack = True,  delimiter = ';' )

I get this: Array Data My data: Diode_A_Upcd.txt

I would like to store each row in individual arrays in order to then plot them

CodePudding user response：

The error message is due to the string being 0,0118. Numpy needs floats to be 0.0118, decimal point not a decimal comma. np.loadtxt has an optional argument converters to allow a function to convert strings in one format to another.

import numpy as np                                                                                               

test_string = [ '0,123;5,234', '0,789;123,45']

def translate( s ): 
    s = s.replace( b',', b'.' ) 
    return s 

conv = { 0: translate, 1: translate } 
# Apply translate to both columns.
                                                                                                   
result = np.loadtxt( test_string, delimiter = ';', converters = conv )

result
#  array([[1.2300e-01, 5.2340e 00],
#         [7.8900e-01, 1.2345e 02]])