Index in position 2 exceeds array bounds

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Federico Paolucci 2022-8-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1772730-index-in-position-2-exceeds-array-bounds

评论： Walter Roberson 2022-8-2

Hi, I have this script

%%
% DEFINIZIONE PARAMETRI DINAMICI   
%DEFINIZIONE vettore frequenze
F_plot=400;               %Frequenza limite dell'analisi
df=0.1;                  
f=[0:df:F_plot];
w=2*pi*f;
%%
% COSTRUZIONE SS  
csi=0.0024;  %  smorzamento percentuale -- 0.05 è il valore nella flexsspf
FREQ_equi=load(['freq_prop.txt']);
pfdx_equi=load(['pffe.txt']);
%modi=[1:length(FREQ_equi)]';
%gamma_equi=pfdx_equi(:,2);    % matrice dei fattori di partecipazione modale 
save('PF1_equi.dat','pfdx_equi', '-ascii')     % | modo | PF1  | PF2  | ... |  PFr |
save('FREQ1_equi.dat','FREQ_equi', '-ascii')    % | modo | freq
type=1; % 1 se spostamento ( q ), 2 se accelerazione ( q** )
        
[Aq,Bq,Cq,Dq]=flexsspf('','PF1_equi.dat','freq_prop.txt',csi,type);  
sysansq_equi=ss(Aq,Bq,Cq,Dq);
%%
% vado a plottare il modulo della funzione di risposta in frequenza 
[mags,phases]=bode(sysansq_equi,w);   
[output,input,frequencies]=size(mags); 
figure (1)
semilogy(f,squeeze(mags(:,1,:)),'linewidth',1)
hold on
grid on
title('Mag FRFs uscite/ingressi')
xlabel('Frequency [Hz]')
ylabel('Mag FRF [Disp Unit/Force Unit]')
legend('q1','q2','q3','q4','q5','q6','q7','q8','q9','q10');

and this error is occurred

In untitled34 (line 43)

Index in position 2 exceeds array bounds.

Error in untitled34 (line 56)

semilogy(f,squeeze(mags(:,1,:)),'linewidth',1)

Can i solve this problem?

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Federico Paolucci 2022-8-2

More or less it is the same, the only differences are these: in flexsspf I inserted the frequency file as .txt instead of .dat, because otherwise it didn't work. Then I removed the number of modes from the input files and then commented "modi" because I don't need it. The fact is that the flexsspf function should work even without the first input which is empty in the script, because in theory only frequencies and pf (participation factors) should suffice