Re: fread using bit8

[Ben Abbott]

On Aug 11, 2011, at 8:00 PM, Hoffman, Christopher S wrote:
>> 
>> -----Original Message-----
>> From: Ben Abbott [mailto:address@hidden 
>> Sent: Thursday, August 11, 2011 12:01 PM
>> To: Hoffman, Christopher S
>> Cc: address@hidden
>> Subject: Re: fread using bit8
>> 
>> 
>> On Aug 11, 2011, at 12:33 PM, Hoffman, Christopher S wrote:
>> 
>>> -----Original Message-----
>>> From: Ben Abbott [mailto:address@hidden 
>>> Sent: Thursday, August 11, 2011 5:29 AM
>>> To: Hoffman, Christopher S
>>> Cc: address@hidden
>>> Subject: Re: fread using bit8
>>> 
>>>> On Aug 10, 2011, at 10:10 PM, Hoffman, Christopher S wrote:
>>>> 
>>>>> -----Original Message-----
>>>>> From: Ben Abbott [mailto:address@hidden
>>>>> Sent: Wednesday, August 10, 2011 6:04 PM
>>>>> To: Hoffman, Christopher S
>>>>> Cc: address@hidden
>>>>> Subject: Re: fread using bit8
>>>>> 
>>>>>> On Aug 10, 2011, at 8:12 PM, Hoffman, Christopher S wrote:
>>>>>> 
>>>>>>> I am trying to use the fread command on bit8 binary data. Octave does 
>>>>>>> not support that, is there a workaround?
>>>>>> 
>>>>>> I haven't tried to do this before, but if you can provide a complete 
>>>>>> example for me I (or someone else) can try to debug it, or find a work 
>>>>>> around.
>>>>>> 
>>>>>> Also please tell us what version of Octave you are running.
>>>>>> 
>>>>>> Ben
>>>>> 
>>>>> Thanks Ben: I will work on an example for you. I am using version 3.2.4.
>>>>> 
>>>>> Chris
>>>> 
>>>> Chris, I tried a short example that works for me.
>>>> 
>>>> fid = fopen ('fubar.bin', 'wb');
>>>> fwrite (fid, magic (5), 'int8');
>>>> fclose (fid);
>>>> fid = fopen ('fubar.bin','rb');
>>>> a = fread (fid, [5,5], 'int8')
>>>> fclose (fid);
>>>> 
>>>> a =
>>>> 
>>>> 17   24    1    8   15
>>>> 23    5    7   14   16
>>>>  4    6   13   20   22
>>>> 10   12   19   21    3
>>>> 11   18   25    2    9
>>>> 
>>>> Ben
>>> 
>>> Cool, so looks like int8 and uint8 can work the same as bit8 and ubit8? 
>>> I'll give it a shot 
>>> 
>> 
>> I've submitted a bug report due to the missing "bitN" format.
>> 
>> https://savannah.gnu.org/bugs/index.php?33991
>> 
>> Ben
>> 
> 
> Ben: I tried using int8 and uint4 for bit8 and ubit4 respectively but octave 
> doesn't like uint4. Tried uint8 and the results are not good. Here is an 
> example, the last few lines in the .m code show what it should be. If you can 
> get this working that would be awesome. Let me know how it goes, and thanks
> 
> Chris


Off the top of my head, I don't have any additional suggestions. 

Ben