Not enough input arguments.

Hi, this error is occurred

Not enough input arguments.

Error in flexsspf (line 34)

PF1=strcmp(PF,'');

this is the script

 function [A,B,C,D]=flexsspf(V,PF,FREQ,CSI,type

PF1=strcmp(PF,'');
if PF1==0;
   pf=load('pffe.mat');
   pf=[pf(:,2:end)];
   fiinp=pf;
   [m,c]=size(pf);
   B2=[zeros(m,c);fiinp];
   D2=[zeros(m,c)];
end

FREQ1=strcmp(FREQ,'');
if FREQ1==0;
   freq=load('freq_prop.mat');
end

k1=exist('B1');
k2=exist('B2');

if k1==1 & k2==1 
   B=[B1 B2];
   D=[D1 D2];
else
    if k2==1
        B=B2;
        D=D2;
    else
        if k1==1
            B=B1;
            D=D1;
        end
    end
end
[Br,Bc]=size(B);
[Dr,Dc]=size(D);

omo=zeros(m,m);
for i=1:m,
    omo(i,i)=2*pi*freq(i);
end

A=[[zeros(m,m),eye(m)];[-omo.^2,-2*0.0024*omo]];
if type ==1
    C=[eye(m),zeros(m,m)];
elseif type ==2
    C=[-omo.^2,-2*0.0024*omo];
   if k1==1 & k2==1 
      D=[fiin fiinp];
   else
      if k2==1
         D=[fiinp];
      else
         if k1==1
            D=[fiin];
         end
      end
   end
end    
    
save matlab_a A -ascii
save matlab_b B -ascii
save matlab_c C -ascii
save matlab_d D -ascii

[Dyuman Joshi]

What is the full error? How are you calling your function?

[Federico Paolucci]

hi, that is the complete error

However, I'm calling the function in this way (I'm working with a state space model9

close all
clear all



%%
% 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.mat']);

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','gamma_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','FREQ1_equi.dat',csi,type);  
sysansq_equi=ss(Aq,Bq,Cq,Dq);

Answer 1

[David Hill]

function [A,B,C,D]=flexsspf(V,PF,FREQ,CSI,type)%missing ')'

PF1=isempty(PF);%recommend using isempty

[Dyuman Joshi]

I was going to comment the same but I tried some things out, strcmp does work what it is intended to

y='';
strcmp(y,'')

ans = logical
   1

z='ab';
strcmp(z,'')

ans = logical
   0

isequal(y,'')

ans = logical
   1

isempty(y)

ans = logical
   1