Line three is an error command, if it throws an error, it is working as intended.

Doug

error(‘Right number of arguments’);
end
Np=pow2(nextpow2(fs/df));
L=Np/4;
P=pow2(nextpow2(fs/dalpha/L));
N=P*L;
if length(x)N
x=x(1:N);
end
NN=(P-1)*L+Np;
xx=x;
xx(NN)=0;
xx=xx(:);
X=zeros(Np,P);
for k=0:P-1
X(:,k+1)=xx(k*L+1:k*L+Np);
end
a =hamming(Np);
XW=diag(a)*X;
XF1=fft(XW);
XF1=fftshift(XF1);
XF1=[XF1(:,P/2+1:P) XF1(:,1:P/2)];
E=zeros(Np,P);
for k=-Np/2:Np/2-1
for m=0:P-1
E(k+Np/2+1,m+1)=exp(-1i*2*pi*k*m*L/Np);
end
end
XD=XF1.*E;
XR=zeros(Np,P*L);
for k=1:P
XR(:,(k-1)*L+1:k*L)= XD(:,k)*ones(1,L);
end
xc=ones(Np,1)*x’;
XM=XR.*xc;
XM=conj(XM’);
XF2=fft(XM);
XF2=fftshift(XF2);
XF2=[XF2(:,Np/2+1:Np) XF2(:,1:Np/2)];
M=abs(XF2);
alphao=(-1:1/N:1)*fs;
fo=(-.5:1/Np:.5)*fs;
Sx=zeros(Np+1,2*N+1);
for k1=1:N
for k2=1:Np
alpha=(k1-1)/N+(k2-1)/Np-1;
f=((k2-1)/Np-(k1-1)/N)/2;
k=1+Np*(f+.5);
l=1+N*(alpha+1);
Sx(k,l)=M(k1,k2);
end
end
Please help me, im having an error in line 3

I am not sure, but I think inf might be the problem for the upper limit on the number of arguments. Can you change it to something like 100 and see if it still fails?

I would put a breakpoint on that line and investigate the values of nargin to make sure it is what you think it is.

Doug

Can you help troubleshoot it? Thank you in advance.

options = struct(‘logp’,false); % default options
if ischar(x) && strcmpi(x,’defaults’)
f = options;
return
end

error(nargchk(2,inf,nargin))

Very often people will use structures

a.alpha = 1;
a.beta = 2;

Cells work too

a{1} = magic(3);
a{2} = ‘Doug’;

Enjoy,
Doug

For us to give you some help, you will need to show us what you tried, in code. There are many things that could have been done incorrectly. The data you have shown would plot well.

Doug

I have been able to import the data but when i try to plot the graph i seem to get line graphs which are not correct.

I have posted sample data below so i can explain better what i am trying to plot

I will go over the links you sent again.

Thanks

x-Height
y-Ergo_Index, Ergo_Index_+Sta. Dev., Ergo_Index_-Sta. Dev.
z-Distance

Height Distance Ergo_Index Eg_Index_+SDev. Erg_Index_-SDev.
1 1 8.02810 8.48252 7.57368
1 1 7.23410 7.68852 6.77968
1 1 6.77290 7.22732 6.31848
1 1 7.26650 7.72092 6.81208
1 1 7.85150 8.30592 7.39708
1 1 7.44710 7.90152 6.99268
1 2 6.85090 7.92199 5.77981
1 2 7.54950 8.62059 6.47841
1 2 8.84650 9.91759 7.77541
1 2 7.35340 8.42449 6.28231
1 2 9.51260 10.58369 8.44151
1 2 8.99790 10.06899 7.92681
1 3 7.90830 8.11751 7.69909
1 3 7.92300 8.13221 7.71379
1 3 7.99560 8.20481 7.78639
1 3 8.15680 8.36601 7.94759
1 3 7.87130 8.08051 7.66209
1 3 8.08800 8.29721 7.87879
1 3 8.34180 8.55101 8.13259
1 3 7.64370 7.85291 7.43449
2 1 9.67030 10.07334 9.26726
2 1 8.95520 9.35824 8.55216
2 1 8.68640 9.08944 8.28336
2 1 8.75610 9.15914 8.35306
2 1 8.99480 9.39784 8.59176
2 1 9.44720 9.85024 9.04416
2 1 9.73000 10.13304 9.32696
2 1 9.30680 9.70984 8.90376
2 2 7.59970 7.85001 7.34939
2 2 7.38770 7.63801 7.13739
2 2 7.45730 7.70761 7.20699
2 2 7.86410 8.11441 7.61379
2 2 7.61410 7.86441 7.36379
2 2 7.70390 7.95421 7.45359
2 2 8.15410 8.40441 7.90379
2 2 7.87890 8.12921 7.62859
3 3 7.28780 7.86754 6.70806
3 3 7.57240 8.15214 6.99266
3 3 8.52170 9.10144 7.94196
3 3 7.88650 8.46624 7.30676
3 3 7.39120 7.97094 6.81146
3 3 8.50380 9.08354 7.92406
3 3 8.30720 8.88694 7.72746
3 3 8.81800 9.39774 8.23826

There are a few steps to this process, it is not clear to me what you are having problems with.

1.) Import data from Excel.
http://blogs.mathworks.com/videos/category/excel/

2.) Doing a 3-d bar graph.
http://www.mathworks.com/matlabcentral/fileexchange/23439

3.) Adding more visualization to a standard plot type.
http://www.mathworks.com/access/helpdesk/help/techdoc/creating_plots/f7-20419.html

What have you tried, and specifically where are you stuck?

-Doug

Sorry to trouble you, I am trying to plot a 3axis(XYZ) bar graph with some data I have in excel, would attach the data here but it doesn’t seem possible to.

x-Height
y-Ergo_Index
z-Distance

I also want to plot the mean, standard deviation +/- of the Ergo_Index on the same graph.

Could you point me in the right direction, I am not too good at matlab, I have tried the gui method to do this but never seem to get a suitable graph or one in 3d either.

Thanks