Confused about atan versus angle- Not getting the same result!

Hi,

So I am creating a GUI to show some admittance data. I have the data in two columns real and imaginary by using the angle command. However, when I attempt to check my data, atan does not give me the same result as angle. I can't figure out why. For instance at the peak of one of the plots, I have real= .003453, imag = .001354.

Then, atan((.001354/.003453))=.38, atand((.001354/.003453))=21.4113. BUT angle((.001354/.003453))=0. Why?

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Here's the code I used in my GUI.

%This selects the proper plot to plot according to slider value (from 1-220).

handles.admdatatocompare = handles.celldata1{1,handles.slidervar};

guidata(hObject,handles);

admtocompare_full=handles.admdatatocompare(:,2)+(1i.*handles.admdatatocompare(:,3));

admchannel=m1(:,2)+(1i.*m1(:,3));

admphasechannel = angle(admchannel);

admphasetocompare = angle(admtocompare_full);

Answer 1

[Stephan]

Hi,

angle works correctly on complex numbers:

atan((.001354/.003453))
atand((.001354/.003453))
angle((.001354i+.003453))
% This is what you did:
angle(.001354/.003453)+0i

Best regards

Stephan

[Sarah Crimi]

Great. Thanks! That makes sense.