matrix index is out of range for deletion

sorry for posting again.I have very large number of text files( each text file is n rows by 4 column and the first column is string) in the directory and i want to export each one by one and excute. For this i write the following code:

   d=dir('*.txt');
    n=length(d);
     x=cell(1,n);
     E=cell(1,n);
for k=1:n;
fid=fopen(d(k).name,'rt');
x{k}= textscan(fid, '%s%f%f%f');
fclose(fid);
A=x{1,k}{1};
E{k}=[x{1,k}{2} x{1,k}{3} x{1,k}(4)];
end
st={'bp','mo','ag','sh'};
 for j=1:length(st)
     E(strncmp(A,st(j),2),:)=[];
     A(strncmp(A,st(j),2),:)=[]; 
       E(abs(E(:,3))>30,:)=[];    
 end

For a single text file the code works. But for multiple file it gives the error message matrix index is out of range for deletion.Any solution Ps. Thanks!

Answer 1

[Walter Roberson]

E{k}=[x{1,k}{2} x{1,k}{3} x{1,k}(4)]; is creating a cell array, but afterwards in the "for" loop you are treating E as a numeric array.