RE: Re: complex numbers in GRC missing documentation?

[Jim Melton]

I had a very confusing conversation with a co-worker where he was describing 
complex numbers as "j + 0.00001". I had no referent for using "j" to represent 
"sqrt(-1)". Apparently Matlab uses "j", Electrical Engineers use "j" (because 
"i" is current), and now I learn that Python supports it as well.

I like "complex(0.5,0.5)" as much less ambiguous. Of course, once you know 
about "j" it's easy to use...

---
Jim Melton

-----Original Message-----
From: Discuss-gnuradio <discuss-gnuradio-bounces+jim.melton=sncorp.com@gnu.org> 
On Behalf Of Aardric
Sent: Thursday, October 21, 2021 13:35
To: discuss-gnuradio@gnu.org
Subject: [EXTERNAL] Re: complex numbers in GRC missing documentation?

I thought and tried but for some unknown internal reason, I used "i"
rather than "j" this time. I didn't think of "complex(real,imag)").
So, this was trivial and the documentation is adequate.
Thanks.


On 2021-10-21 12:28 p.m., Marcus D. Leech wrote:
> On 2021-10-21 3:21 p.m., Aardric wrote:
>> Hail,
>>      I'm surprised that I haven't encountered this before but I am 
>> unable to enter a complex number in a GRC field for example the "Signal 
>> Source"
>> block (gr version: 3.9.3). There doesn't appear to be documentation, 
>> at least in an obvious place.
>> Entering (0.5,0.5) in the complex offset field yields:
>> Param - Offset(offset):
>>      Expression (0.5, 0.5) is invalid for type 'complex'.
>>
>> A single float value offsets I but not Q.
>>
>> I apologize if I have missed something totally obvious.
>> BTW: the documentation is improving nicely over time; my compliments 
>> to the contributors.
>>
>> Rick
>>
>>
>>
> They are necessarily Python expressions, so
>
> complex(real,imag)
>
> or
>
> 1.0+0j
>
> Etc
>
>



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