Error using "plot" : Data must be numeric, datetime, duration or an array convertible to double??
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Hi everyone. I wrote the following code but I get this error:
"error using plot: Data must be numeric, datetime, duration or an array convertible to double."
Kindly resolve this issue.
clear all
close all
clc
s=tf('s');
H = 1/(12*s+1);
Gp = 70/(50*s+1);
Gv=0.02/(4*s+1);
Gc = 0.0799;
Tsp = 1/s;
D = -0.01/s;
% Open loop transfer function:
GsHs = Gp*Gv*H;
sys = feedback(Gc*Gp*Gv,H);
stepinfo(sys)
t = 0:0.1:15;
[y,t] = step(sys);
e = 1-y; %this is E(s) due to Tsp(s) and D(s)
figure(1)
plot(t,e,'linewidth',2)
xlim([0,t(end)])
grid
title('error')
figure(2)
[y,t] = step(sys);
U = e.*Gc;
subplot(4,1,1);
plot(t,U,'linewidth',2);
grid
title('U(s)')
[y,t] = step(sys);
U0 = U.*Gv;
subplot(4,1,2);
step(U0);
grid
title('U0(s)')
[y,t] = step(sys);
T = (U0+D).*Gp;
subplot(4,1,3);
plot(t,T,'linewidth',2);
grid
title('T(s)')
[y,t] = step(sys);
Tm = T.*H;
subplot(4,1,4);
plot(t,Tm,'linewidth',2);
grid
title('Tm(s)')
2 件のコメント
Mathieu NOE
2020 年 12 月 31 日
hi
multiple errors because you attempt to plot a transfer function structure like here
Error in tmp (line 39)
plot(t,T,'linewidth',2);
what did you intend to plot from transfer function T ?
採用された回答
Star Strider
2021 年 1 月 1 日
Apparently, the error is that subplot attempts to plot a transfer function step response without evaluating it.
Try this instead:
[y,t] = step(sys);
T = (U0+D).*Gp;
[y1,t1] = step(T);
subplot(4,1,3);
plot(t1,y1,'linewidth',2);
grid
title('T(s)')
[y,t] = step(sys);
[y2,t2] = step(T.*H);
subplot(4,1,4);
plot(t2,y2,'linewidth',2);
grid
title('Tm(s)')
That ran without error.
You need to determine if it does what you want.
4 件のコメント
Star Strider
2021 年 1 月 9 日
That is because both ‘U0.Numerator’ and ‘U0.Denominator’ are both (127x1) cell arrays.
Taking a closer look at the first 5:
U0Num = U0.Numerator;
U0N_Detail = cell2mat(U0Num(1:5));
are:
U0N_Detail =
0 0.001598000000000
0 0.001596545200156
0 0.001593037273404
0 0.001588374882729
0 0.001583104870235
and:
U0Den = U0.Denominator;
U0D_Detail = cell2mat(U0Den(1:5));
are:
U0D_Detail =
4 1
4 1
4 1
4 1
4 1
There are 127 of these transfer functions total, and so all 127 are plotted.
If you want different results, you will need to change your code to produce the results you want.
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