Reading binary big endian files in python

Question

I'd like to use python read a large binary file in ieee big endian 64bit floating point format, but am having trouble getting the correct values. I have a working method in matlab, as below:

fid=fopen(filename,'r','ieee-be');
data=fread(fid,inf,'float64',0,'ieee-be');
fclose(fid)

I've tried the following in python:

data = np.fromfile(filename, dtype='>f', count=-1)

This method doesn't throw any errors, but the values it reads are extremely large and incorrect. Can anyone help with a way to read these files? Thanks in advance.

Can you add a link to an example of a file like this?

Yuval Pruss
– Yuval Pruss

2018-07-16 23:03:14 +00:00
Commented Jul 16, 2018 at 23:03 — Yuval Pruss
– Yuval Pruss, Commented Jul 16, 2018 at 23:03

ilmarinen · Accepted Answer · 2018-07-16 23:06:01Z

4

Using >f will give you a single-precision (32-bit) floating point value. Instead, try

data = np.fromfile(filename, dtype='>f8', count=-1)

answered Jul 16, 2018 at 23:06

ilmarinen

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