Re: [Discuss-gnuradio] How to use the read_float_binary.m function

[Josh Blum]

On 10/27/2011 07:09 PM, hasanimam wrote:
> 
> Well, I have been able to run the program somehow. The following code is what
> I used.
> 
> import numpy
> 
> numpy.fromfile("observed_data", dtype=float, count=-1, sep='')
> 

See my previous email about the data type. I do not think you want to
parse the data as a float64/double. Right?

> Now, the problem is that the file I am getting does not show anything. I
> mean the characters in the file are still unreadable.
> 
> I want numpy to convert the binary file to a readable one.
> 
> Any idea?
> 
> hasanimam wrote:
>>
>> Hello Josh,
>>
>> Thank you. In fact I am a very newcomer to use gnuradio.
>> I tried to follow your advice.
>> I wrote the code in python like,
>> numpy.fromfile(observed_data, dtype=float, count=-1, sep='')
>>
>> Here, observed_data is the file which is created using the gr_file_sink
>> command.
>> However, it gives an error called "NameError: global name 'numpy' is not
>> defined".
>>
>> Do you have any idea about it?
>>
>> Thanks
>>
>> On Fri, Oct 28, 2011 at 10:16 AM, Josh Blum <address@hidden> wrote:
>>
>>>
>>>
>>> On 10/27/2011 06:14 PM, hasanimam wrote:
>>>>
>>>> Hello Marcus,
>>>>
>>>> I really appreciate your help.
>>>>> Those files (read_float_binary.m and read_complex_binary.m) are MATLAB
>>>> macros, intended to be used directly by MatLab.
>>>>
>>>> Did you mean that, the binary file which will be created by the
>>>> gr_file_sink, is needed Matlab to open?
>>>> Ok, then I will take the file to another PC where Matlab is installed
>>> and
>>>> will try to open it.
>>>> However, I was looking for some way to directly convert the file into
>>> .txt
>>>> or any other readable format using the python program.
>>>
>>> see numpy.fromfile, use the type numpy.complex64
>>>
>>> The data stored to file is just an array of std::complex<float> or
>>> std::complex<int16>
>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Marcus D. Leech wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> I am in deep deep trouble. And it would be really great if somebody
>>> come
>>>>>> up
>>>>>> with any sort of help.
>>>>>>
>>>>>> I am trying to collect the raw data using USRP2. I used the
>>>>>> gr_file_sink(itemsize, "filename") for this. The "filename" is a
>>> binary
>>>>>> file
>>>>>> and so it cant be seen/open. I googled in the internet to find a way
>>> of
>>>>>> converting the binary file to something else. I found that there is
>>> one
>>>>>> thing named read_float_binary.m and read_complex_binary.m to convert
>>> the
>>>>>> data into a matlab file. This function is written in C++. I realized
>>> that
>>>>>> I
>>>>>> have to use this function but dont know how to do it. Should I use
>>> this
>>>>>> function directly to the python program or in the gr_file_sink.cc
>>>>>> program.
>>>>>>
>>>>>> It would be really helpful if somebody writes the exact command for
>>> this.
>>>>>>
>>>>>> This is really urgent and I will appreciate it very much if somebody
>>>>>> comes
>>>>>> forward.
>>>>>>
>>>>>> Thank you
>>>>> Those files (read_float_binary.m and read_complex_binary.m) are MATLAB
>>>>> macros, intended to
>>>>>    be used directly by MatLab.  If you don't know how to use MatLab,
>>>>> this is likely the wrong list
>>>>>    to get high-quality help in that direction.  Just sayin'
>>>>>
>>>>> --
>>>>> Marcus Leech
>>>>> Principal Investigator
>>>>> Shirleys Bay Radio Astronomy Consortium
>>>>> http://www.sbrac.org
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Discuss-gnuradio mailing list
>>>>> address@hidden
>>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>>>>
>>>>>
>>>>
>>>
>>> _______________________________________________
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>>>
>>
>>
>>
>> -- 
>> Hasan Rajib Imam
>> University of Electro-Communication, Japan
>> 1st year Masters Student
>> Email: address@hidden
>> Contact No: (+81)80-5004-5931
>>
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