How to plot pzmap, nyquist plot and bode plot in App Designer

I have this GUI that accepts values for K,a,b,c,d and n to change the transfer function. My step response plot works fine but my pzmap, nyquist plot and bode plot wont work. The error message says : Error using plot

Data cannot have more than 2 dimensions.

Kvalue=app.EntervalueforKEditField.Value;

avalue=app.EntervalueforaEditField.Value;

bvalue=app.EntervalueforbEditField.Value;

cvalue=app.EntervalueforcEditField.Value;

dvalue=app.EntervaluefordEditField.Value;

nvalue=app.EntervaluefornEditField.Value;

sexplaststring = "";

i=5;

while i>0

if(nvalue>0)

sexpstring = " 0";

sexplaststring= sexpstring + sexpstring;

nvalue = nvalue -1;

end

i = i -1;

end

nvalue = app.EntervaluefornEditField.Value;

if(nvalue==0)

strdenom = "1 " + int2str(cvalue + dvalue) +" "+ int2str(cvalue*dvalue);

end

if(nvalue==1)

strdenom = "1 " + int2str(cvalue + dvalue) + " " + int2str(cvalue*dvalue) +" 0";

else

strdenom = "1 " + int2str(cvalue + dvalue) + " " + int2str(cvalue*dvalue) + sexplaststring;

end

gs=tf([Kvalue*avalue Kvalue*bvalue], [str2num(strdenom)]);

[Gm,Pm,Wcg,Wcp]=margin(gs);

app.Gmvalpz.Text = num2str(Gm);

app.Pmvalpz.Text = num2str(Pm);

app.Wcgvalpz.Text = num2str(Wcg);

app.Wcpvalpz.Text = num2str(Wcp);

[z,p,k]=tf2zp([Kvalue*avalue Kvalue*bvalue],[str2num(strdenom)]);

[y,t]=pzmap(p,z);

plot(app.UIAxes,t,y);

Answer 1

[Shiva Kalyan Diwakaruni]

Hi,

You are receiving this error message because the data that you are plotting is an array, which has 3 dimensions. You can only plot data with two dimensions or less (e.g., a vector or a matrix).

Remove the extra singleton dimension in your data with the SQUEEZE function. For example The SQUEEZE function turns the 1x1x50 array into a 50x1 array that you can then plot.

refer to the below link

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

Hope it helps