Drexel dragonThe Math ForumDonate to the Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.matlab

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

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Steven Lord

Posts: 17,945
Registered: 12/7/04
Re: ploting in db
Posted: Mar 19, 2013 5:25 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

"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


Steve Lord
To contact Technical Support use the Contact Us link on

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum 1994-2015. All Rights Reserved.