Python 2 bytes binary array conversion to interger or float

Question

I read a binary array from a digital scope, but then I can't do anything with the binary array. in Matlab this is a simple job: Data is the Array ( 2 bytes per sample, binary format) it can be converted to 16bit integer with this instruction

 Data = typecast(uint8(Data),'int16'); %convert data to int16

and then to float using

 Data = double(Data); %covert data to double to be able to perform math

In Python i have the same array called dataIn , read from an instrument. I cannot find a way to convert the binary array into a 16 bit array of integers, and then to a vector of real values.

If anyone has solved this issue I would appreciate some help. Thanks

mgilson · Accepted Answer · 2023-09-27 20:44:47Z

3

If you're using numpy, this is pretty easy:

data = numpy.frombuffer(bytes_data, dtype=numpy.uint16)
data = numpy.array(data, dtype=float)

edited Sep 27, 2023 at 20:44

answered Sep 22, 2014 at 15:42

mgilson

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4 Comments

Maurizio Mastrofini Over a year ago

never mind...I have seen the solution posted while i was writing. Thank you so much, it works just as expected. I was looking in the wrong section (struc and array conversion). I will now read the numpy related documentation.

Maurizio Mastrofini Over a year ago

in Python 3.7 I was getting an error, and had to modify the command

mgilson Over a year ago

In the modern world, I think the numpy API has changed to push people to use np.frombuffer instead of np.fromstring -- I've updated the answer to reflect that.

Maurizio Mastrofini Over a year ago

Yes, this is the case....Numpy update

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