I'm unable to figure out this error ''too many input arguments"

clear all; close all;
clc;
t=[0:1:10];
x=[2:2:20];
rbw = 75e3;
FrOffset = [100e3 300e3 500e3 1e6 3e6 10e6];
PNTarget = [-130 -140 -135 -130 -140 -155];
[PNMeasure] = phaseNoiseMeasure(t,x,rbw,FrOffset,'on','Phase noise',PNTarget,'Type','Time','Histogram','off')
plot(FrOffset,PNMeasure);

[naheeda reshi]

Error using phaseNoiseMeasure

Too many input arguments.

Error in pn_meas (line 8)

[PNMeasure] = phaseNoiseMeasure(t,x,rbw,FrOffset,'on','Phase

noise',PNTarget,'Type','Time','Histogram','off')

[dpb]

t=[0:1:10];
x=[2:2:20];
whos t x

  Name      Size            Bytes  Class     Attributes

  t         1x11               88  double              
  x         1x10               80  double              

t=[1:1:10];
rbw = 75e3;
FrOffset = [100e3 300e3 500e3 1e6 3e6 10e6];
PNTarget = [-130 -140 -135 -130 -140 -155];
[PNMeasure] = phaseNoiseMeasure(t,x,rbw,FrOffset,'on','Phase noise') %  Try the shortest list given as inputs...,PNTarget,'Type','Time','Histogram','off')

Index in position 2 exceeds array bounds.

Error in phaseNoiseMeasure (line 206)
PnReal=interp1(PhaseNoisePn(:,1),PhaseNoisePn(:,2),FrOffset);

[PNMeasure] = phaseNoiseMeasure(t,x,rbw,FrOffset,'on','Phase noise',PNTarget,'Type','Time','Histogram','off')
plot(FrOffset,PNMeasure);

Get different error -- first compained that t,x weren't same length so fixed that as shown, then the above.

I have no idea what the function is trying to do so no real klew about where the interpolation issue might be coming from...

In just reading the input description, it seems to meet the syntax definition

phaseNoiseMeasure

[PNMeasure] = phaseNoiseMeasure(t,x,rbw,FrOffset,'on','Phase noise') %  Try the shortest list given as inputs...,PNTarget,'Type','Time','Histogram','off')

The first input form you gave erred trying to use griddedinterpolant internally on a dimension mismatch of needing multiple dimensions. So, I cut the input down to the minimal number of inputs given in the documentation and then it aborted as above trying to use interp1. As noted, since I've no klew what the function is trying to do, I don't hve any idea what it's trying to interpolate over, but my initial guess of your specific input problem is that the magnitude of the phase frequencies of the input signal, being just a straight line aren't commensurate with the requested values you've asked for in the otherr inputs and the function just isn't robust-enough to handling nonsensical inputs to catch the issue.

I couldn't reproduce your initial question error with the input case you provided, however...

My suggestion would be to go back to using one of the sample datasets and learn how to use the function with them and the given examples in the doc, then use real-world data (or at least some made up that will have real frequency components in it in the ranges expected by the analysis and results will likely be much better.

Answer 1

[Dinesh]

Hi Naheeda!

I tried reproducing the issue on my side. The arrays ‘t’ and ‘x’ should be of the same dimension here ‘t’ is of dimensions 1 * 11 and ‘x’ is of dimensions 1 * 10. So, that must be changed. I am not getting the too many input arguments error as the input arguments for the function phaseNoiseMeasure are correct.

Now running phaseNoiseMeasure will prompt an interpolation error and this is about not having enough sample points to perform the interpolation operation. So, increase the number of sample points. After using the following ‘x’ and ‘t’ the function will work.

x = rand (1,100,'double');
t = linspace (1,2, 100);

Please refer to the following MATLAB documentation regarding examples on phase noise profile from time domain signal.

https://www.mathworks.com/help/msblks/ref/phasenoisemeasure.html

For details about ‘linspace’ and ‘rand’ functions refer the following MATLAB documentations

https://www.mathworks.com/help/matlab/ref/linspace.html

https://www.mathworks.com/help/matlab/ref/rand.html

hope this helps,

Thank you!