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Topic: ploting in db
Replies: 5   Last Post: Mar 19, 2013 6:49 PM

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Steven Lord

Posts: 17,944
Registered: 12/7/04
Re: ploting in db
Posted: Mar 19, 2013 5:25 PM
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"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

--
Steve Lord
slord@mathworks.com
To contact Technical Support use the Contact Us link on
http://www.mathworks.com




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