Python or matplotlib limitation error

Question

I wrote an algorithm using python and matplotlib that generates histograms from some text input data. When the number of data input is approx. greater than 15000, I get in the (append) line of my code:

mydata = []

for i in range(len(data)):
   mydata.append(string.atof(data[i]))

the error:

Traceback (most recent call last):
  File "get_histogram_picture.py", line 25, in <module>
    mydata.append(string.atof(data[i]))
  File "/usr/lib/python2.6/string.py", line 388, in atof
    return _float(s)
ValueError: invalid literal for float(): -a

can it be an error in python ? What is the solution ?

Thanks

Looks like something invalid in your data.

phkahler
– phkahler

2010-03-17 18:32:33 +00:00
Commented Mar 17, 2010 at 18:32 — phkahler
– phkahler, Commented Mar 17, 2010 at 18:32
exactly, sorry, I got it, Drin less coffee :-P

Open the way
– Open the way

2010-03-17 18:38:44 +00:00
Commented Mar 17, 2010 at 18:38 — Open the way
– Open the way, Commented Mar 17, 2010 at 18:38

Mark · Accepted Answer · 2010-03-17 18:39:14Z

1

That's a data parsing error:

>>> float("-a")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: invalid literal for float(): -a

Python data structure size if only limited by the available memory.

answered Mar 17, 2010 at 18:39

Mark

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