index out of bounds because numel(x)=1.

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I am trying to create a loop to call different variables at each time but I am getting this message "index out of bounds because numel(x)=1."
What am I doing wrong?
> x(1)=50;
>> x(2)=45;
>> x(3)=89;
>> x(4)=88;
>> for i=1:1:4
x=x(i);
end
??? Attempted to access x(2); index out of bounds
because numel(x)=1.
  3 Comments
Mevlüt Yalaz
Mevlüt Yalaz on 4 Jul 2016
you have to initialize first the dimension of x. Then you get what you want
Walter Roberson
Walter Roberson on 4 Jul 2016
No, that is incorrect, Mevlüt Yalaz . The problem is that one value is extracted from x and that one value is used to overwrite all of x.

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Accepted Answer

per isakson
per isakson on 17 Jun 2013
Edited: per isakson on 17 Jun 2013
This script
x(1)=50;
x(2)=45;
x(3)=89;
x(4)=88;
disp(x)
for ii=1:1:4
x=x(ii);
disp(x)
end
returns
50 45 89 88
50
Attempted to access x(2); index out of bounds because numel(x)=1.
>>
The vector x is overwritten by the first value of x

More Answers (1)

Kalyne
Kalyne on 17 Jun 2013
Edited: Walter Roberson on 4 Jul 2016
Thanks for the answer! I am asking this because I am trying to solve the problem below. But now when I try to run, it appears :
"??? Cell contents reference from a non-cell array object.
Error in ==> TESTAR at 35
problem_statement=problem_statement{i}"
the program:
clear;
run('..\psg_load_libraries');
addpath('..');
clear problem_statement;
problem_statement{1}= textread('problem_DEA_Hospital.txt','%s', 'whitespace', '');
problem_statement{2}= textread('problem_DEA_Hospital2.txt','%s', 'whitespace', '');
% read and print problem statement
for i=1:1:2
problem_statement=problem_statement{i};
problem_statement=problem_statement{i};
fprintf('Problem statement:\n%s', problem_statement);
end
  2 Comments
per isakson
per isakson on 17 Jun 2013
Your text would be easier to read if you format/markup it; use the {}Code button
clear; run('..\psg_load_libraries'); addpath('..');
clear problem_statement;
problem_statement{1}= textread('problem_DEA_Hospital.txt' ...
,'%s', 'whitespace', '');
problem_statement{2}= textread('problem_DEA_Hospital2.txt' ...
,'%s', 'whitespace', '');
for ii=1:1:2
problem_statement=problem_statement{ii};
problem_statement=problem_statement{ii};
fprintf('Problem statement:\n%s', problem_statement);
end
Based on this code, it is not possible (for me) to understand what you want to do. The code says that you want to read two files and write something. Maybe the files each contains a single line.
Walter Roberson
Walter Roberson on 4 Jul 2016
Your line
problem_statement=problem_statement{ii};
takes the ii'th element of problem_statement, and writes that over top of all of problem_statement, so afterwards problem_statement is probably going to be a string instead of a cell array of strings.

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