Index exceeds matrix dimensions

Question

Killian Onwudiwe 2019-8-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/475264-index-exceeds-matrix-dimensions

评论： Walter Roberson 2019-8-8

please how do I solve the problem of "Index exceeds matrix dimensions".

it keeps return an error on this line "datStruct = importdata(fileNameArray(i).name);" showing that fileNamearray has a strcuture of 0x1 and the index i has a 1x1 structure

below is my code

% shear strain 10A_4_4_55+2_4 right cell
clc;clear;
fileNameArray = dir('*.dat');
for i = 1:50
    datStruct = importdata(fileNameArray(i).name);
    a1 (:,i)= datStruct.data(1173,:); 
    a2 (:,i)= datStruct.data(1175,:); 
    a3 (:,i)= datStruct.data(1167,:); 
    a4 (:,i)= datStruct.data(1181,:);
    a5 (:,i)= datStruct.data(1197,:);
    a6 (:,i)= datStruct.data(1213,:); 
    a7 (:,i)= datStruct.data(1250,:); 
    a8 (:,i)= datStruct.data(1309,:); 
    a9 (:,i)= datStruct.data(1369,:); 
    a10 (:,i)= datStruct.data(1425,:);
    a11 (:,i)= datStruct.data(1448,:);
    a12 (:,i)= datStruct.data(1469,:); 
    a13 (:,i)= datStruct.data(1478,:);
    a14 (:,i)= datStruct.data(1476,:);
    a15 (:,i)= datStruct.data(1474,:); 
    a16 (:,i)= datStruct.data(1445,:); 
    a17 (:,i)= datStruct.data(1410,:);
    a18 (:,i)= datStruct.data(1372,:);
    a19 (:,i)= datStruct.data(1311,:); 
    a20 (:,i)= datStruct.data(1233,:); 
    
end;
 
 
%{ 
    
 nucleus
    a1 (:,i)= datStruct.data(1275,:); 
    a2 (:,i)= datStruct.data(1277,:); 
    a3 (:,i)= datStruct.data(1281,:); 
    a4 (:,i)= datStruct.data(1285,:);
    a5 (:,i)= datStruct.data(1315,:);
    a6 (:,i)= datStruct.data(1317,:); 
    a7 (:,i)= datStruct.data(1321,:); 
    a8 (:,i)= datStruct.data(1325,:); 
    a9 (:,i)= datStruct.data(1359,:); 
    a10 (:,i)= datStruct.data(1363,:);
    a11 (:,i)= datStruct.data(1367,:);
    a12 (:,i)= datStruct.data(1398,:); 
    a13 (:,i)= datStruct.data(1402,:);
    a14 (:,i)= datStruct.data(1433,:);
    a15 (:,i)= datStruct.data(1435,:); 
    a16 (:,i)= datStruct.data(1439,:); 
%}

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Stephen23 2019-8-7

Numbering variables like that is a sign that you are doing something wrong.

Using indexing makes code simpler and more reliable.

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Answer 1

David K. 2019-8-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/475264-index-exceeds-matrix-dimensions#answer_386613

在 MATLAB Online 中打开

It appears that for some reason fileNameArray is not being populated with values in the line

fileNameArray = dir('*.dat');

Make sure that you that the .dat files you are looking for are in your working folder. If they are in a folder within the working folder you may need to try

dir('*/*.dat')

or

dir('**/*.dat')

4 个评论
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Killian Onwudiwe 2019-8-8

thank you this worked fine for me but gives me another error

Attempt to reference field of non-structure array.

Error in normalcell (line 11)

a1 (:,i)= datStruct.data(1173,:);

P.S. I am a newbie in programming and really dont have deep understanding.

Thank you for helping

Walter Roberson 2019-8-8

importdata() sometimes returns pure numeric arrays instead of a structure. I avoid using importdata(). You should consider using xlsread() or readtable(); if you have R2019a or later you might be able to use readmatrix()

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