How can I fix this code and run it? Please! Index exceeds matrix dimensions. Error in AccelerationWeek10 (line 28) s = s(1:npts/2+1); % truncate (removes complex conjugates) Published with MATLAB® R2017b

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Stephen Bell 2018-5-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/400945-how-can-i-fix-this-code-and-run-it-please-index-exceeds-matrix-dimensions-error-in-accelerationw

评论： Walter Roberson 2018-5-16

Simulink and Matlab code

close all
npts = 2^15;
sfreq = 22150;
dt = 1/sfreq;
t = (0:npts-1)'*dt;
m = 500 % mass
k = 1000000;
c= 1000;
naturalFr = sqrt(k/m)
 sim('week7')% Simulink
figure(1)
plot(Accel)
xlabel('Time [s]')
ylabel('Signal [units]')
s = fft(Accel.Data);%3
figure(2)
subplot(211)
plot(real(s))
grid on
xlabel('Index')
ylabel('Real')
subplot(212)
plot(imag(s))
grid on
xlabel('Index')
ylabel('Real')
% % folding and scaling
s = s(1:npts/2+1); % truncate (removes complex conjugates)
s = s/npts; % scale
s(2:end-1) = 2* s(2:end-1); % fold 6
df = sfreq/npts;
freq = (0:npts/2)'*df;
mag = abs(s);% 7
% mag1 = sqrt(imag(s).^2+real(s).^2);%
mag1 = atan(imag(s)/real(s));
figure(3)
plot(freq,mag)
hold on
plot(freq,mag1)
grid on
xlabel('Frequency [Hz]')
ylabel('Magnitude [units]')
m =
     500
naturalFr =
     44.7214
Warning: Cannot find an exact case-sensitive match for the model or library name
'<a href="matlab:open_system ('week7')">week7</a>'.
Using the closest case-insensitive match: '<a href="matlab:open_system
('Week7')">Week7</a>'.
Case-insensitive matching will be removed in a future release. Specify exact
case instead. 
Warning: Output port 1 of '<a href="matlab:open_and_hilite_hyperlink
('Week7/Signal Generator','error')">Week7/Signal Generator</a>' is not
connected. 
Warning: Output port 1 of '<a href="matlab:open_and_hilite_hyperlink
('Week7/Sine Wave1','error')">Week7/Sine Wave1</a>' is not connected. 
Warning: Input port 1 of '<a href="matlab:open_and_hilite_hyperlink ('Week7/To
Workspace','error')">Week7/To Workspace</a>' is not connected. 
Warning: Input port 1 of '<a href="matlab:open_and_hilite_hyperlink ('Week7/To
Workspace2','error')">Week7/To Workspace2</a>' is not connected. 
Index exceeds matrix dimensions.
Error in AccelerationWeek10 (line 28)
s = s(1:npts/2+1); % truncate (removes complex conjugates)
Published with MATLAB&reg; R2017b

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Walter Roberson 2018-5-16

This appears to be the same question as https://www.mathworks.com/matlabcentral/answers/400575-how-can-i-make-this-work-please-in-accelerationweek10-line-10-index-exceeds-matrix-dimensions

The output here shows that you are trying to call upon a Simulink model named "week7" but that no such model exists. You do, however, have a Simulink model named "Week7" with a capital W.

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