Re: [Discuss-gnuradio] Cumsum block on GRC

[mehmet kabasakal]

Hi Nick,

I made the change you suggested and it worked, thanks a lot.

Mehmet.

2011/5/7, Nick Foster <address@hidden>:
> On Sat, 2011-05-07 at 15:53 +0100, Tom Rondeau wrote:
>> On Sat, May 7, 2011 at 3:44 PM, mehmet kabasakal
>> <address@hidden> wrote:
>>         Hi List,
>>
>>         I am trying to write a block, that finds the cumulative sum of
>>         the points.
>>         But when i run the block on GRC, the output of the block
>>         becomes as in
>>         the attached figure. It wraps for a period of time. I expect
>>         it to go
>>         negatively downwards. Because i am accumulating negative
>>         values. I
>>         couldn't understand the reason. Is there something missing in
>>         the
>>         code. The c++ code of the block is attached also.
>>
>>         Thanks for the help!
>>         Mehmet.
>>
>>
>>
>> Mehmet,
>> It looks like it's because you are setting out[0] = 0 before entering
>> the for loop in your work function. This will then reset the counter
>> every time you enter work.
>
> I'm pretty sure it won't work even if you remove that call. You can't
> count on out[0] having any sort of reasonable value when invoking the
> work call. Try saving the cumulative sum in a private member variable of
> your class, initialize it to 0 in your constructor, and setting out[0]
> to that saved value when starting each work function call.
>
> --n
>
>>
>>
>> Tom
>>
>>
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> address@hidden
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
>