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

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Kalyne 2013-6-17

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评论： Walter Roberson 2016-7-4

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.

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Mevlüt Yalaz 2016-7-4

you have to initialize first the dimension of x. Then you get what you want

Walter Roberson 2016-7-4

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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Answer 1

per isakson 2013-6-17

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https://ww2.mathworks.cn/matlabcentral/answers/79314-index-out-of-bounds-because-numel-x-1#answer_89038

编辑：per isakson 2013-6-17

在 MATLAB Online 中打开

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

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Answer 2

Kalyne 2013-6-17

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https://ww2.mathworks.cn/matlabcentral/answers/79314-index-out-of-bounds-because-numel-x-1#answer_89039

编辑：Walter Roberson 2016-7-4

在 MATLAB Online 中打开

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

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per isakson 2013-6-17

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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 2016-7-4

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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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