Dahua Lin wrote:
> With the latest Julia, you can do this by
> sumabs2(x)
>
> Dahua
>
>
> On Wednesday, July 16, 2014 9:57:54 AM UTC-5, Neal Becker wrote:
>>
>> As a first exercise, I wanted to code magnitude squared of a complex
>> 1-d array. Here is what I did:
>>
>> mag_sqr{T} (x::Array{Complex{T},1}) =
>> sum(real(x).*real(x)+imag(x).*imag(x))
>>
>> Is this a "good" approach? I'm wondering if it's not very efficient,
>> since I
>> expect it would compute matrixes of element-wise products first, rather
>> than
>> doing the sum as a running summation (like a loop in c++).
>>
>> Can you suggest something "better"?
>>
>>
Not exactly answering my question, as I was looking for a learning opportunity.
But this raises another question:
In [2]:
help(sumabs2)
INFO: Loading help data...
sumabs2 (generic function with 2 methods)
Why is the help data not being shown? (this is ipython notebook interface)
