Unrecognized function or variable 'RESB'.

Hi, this errors are occurred:

Warning: Function input has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential name conflict.

reader_pf

21 for i=1:length(a)

Unrecognized function or variable 'RESB'.

Error in reader_pf (line 35)

for i=1:length(RESB)

this is the script of the function reader_pf

function [RES]=reader_pf(~);

% pulisce il file ANSYS dei fattori di partecipazione
%
% INPUT		
% file			nome del file ANSYS
% cleaned_file		nome del file pulito
%
% OUTPUT
% RES			matrice dei fattori di partecipazione

fid1=fopen("pffe.mat");
C = textscan(fid1,'%s');
fclose(fid1);
a=C{1};
%A=[a{1}];
%b=strcmp(A,'NOTE');
%C=strcmp(A,'NO.');
%k=0;
%kk=k;
for i=1:length(a)
      A=[a{i}];
      B=strcmp(A,'NOTE');
      C=strcmp(A,'NO.');
      if B==1
        k1=k+1;
        RESB(k1)=i;
      end
      if C==1
        kk1=kk+1;
        RESC(kk1)=i;
      end
end

for i=1:length(RESB)
    BB{i}=a(RESC(i)+10:RESB(i)-2);
end

for i=1:k
    a=BB{z};
    la=length(a);
    for j=1:la-4
        A=[a{j+4}];
        X(j,i)=str2num(A);
    end
end

RES=[X(1:2:end,1) X(2:2:end,:)];
save(cleaned_file, 'RES', '-ascii')

Answer 1

[Walter Roberson]

fid1=fopen("pffe.mat");
C = textscan(fid1,'%s');

You are opening a .mat file, and trying to read a string from the beginning of the file. What happens if the .mat file has no string there? Then C{1} will be empty, and length(a) will be 0.

You need to have pretty good reasons to use fopen() with a .mat file, as .mat files are binary files, not text files. You would need to have studied the documentation on the internal structure of .mat files before you can meaningfully read data from a .mat file.