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dpb
Posts:
6,677
Registered:
6/7/07
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Re: ploting in db
Posted:
Mar 19, 2013 6:49 PM
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On 3/19/2013 4:25 PM, Steven_Lord wrote:
>
>
> "dpb" <none@non.net> wrote in message
> news:kiaaa6$s4e$1@speranza.aioe.org...
>> On 3/19/2013 12:05 PM, Steven_Lord wrote:
>>>
>>>
>>> "Yousef " <yayatoure@hotmail.com> wrote in message
>>> news:kia1ui$9hl$1@newscl01ah.mathworks.com...
>>>> Hi Guys,
>>>>
>>>> Can anybody help me to change my y-axis to (db) logarithmic scale..
>>>> part of my code looks like:
>>>>
>>>>
>>>> c=sqrt(abs(data(:,2)).^2 + abs(data(:,3)).^2);
>> ...
>>
>> Steven answered the axis question,
>
> Yes, I did focus on that piece and didn't look at the code.
>
>> I'll simply note that the above can be written more succinctly as
>>
>> c=abs(complex(data(:,2),data(:,3)));
>>
>> The abs() in your expression are purely superfluous since squaring a
>> value makes it positive.
>
> Even more succinctly, you can probably just replace this with a call to
> HYPOT.
>
> http://www.mathworks.com/help/matlab/ref/hypot.html
If have recent-enough version, yes...
>> help hypot
hypot.m not found.
>>
I've not yet learned all the new functions and generally don't use the
gratis new release owing to it overwhelming my old machine, unfortunately...
--
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