MATLAB Answers

Index exceeds number of array elements error

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Yoobin Lee
Yoobin Lee on 22 May 2020 at 9:43
Commented: Raunak Gupta on 27 May 2020 at 9:41
Hello there, I'm trying to get user input data and put them into existing excel data. However, when I run the code, at line 20, said error message pops up. I don't get why it happens - can anybody help me fix this problem?
close all;
clear all;
clc;
[num,txt,everything]=xlsread('filename.xlsx');
n=length(everything)+1;
while(1)
fprintf('---------------------------\n')
fprintf('1) car registration \n')
fprintf('0) close the programme \n')
fprintf('---------------------------\n')
m=input('enter the choice : ');
if m==1
fprintf(' *1) car registration \n')
fprintf('---------------------------\n')
number=input('- Vehicle information number :','s');
year=input('- starting year of registration(year) :');
period=input('- registration period(year) :');
owner=input('- owner :','s');
l=cell2mat(length(number)); %here I get the error
Anew={number(1:l-5),number(l-4),number(l-3:l),year,year+period,owner};
everything(n,1)=(Anew(1,1));
everything(n,2)=(Anew(1,2));
everything(n,3)=(Anew(1,3));
everything(n,4)=(Anew(1,4));
everything(n,5)=(Anew(1,5));
everything(n,6)=(Anew(1,6));
n=n+1;
end
if m==0
xlswrite('filename',everything);
break;
end
end

  9 Comments

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Rik
Rik on 22 May 2020 at 14:25
If you run this
clc, which length -all
you get "index exceeds the number of array elements (1)"?
Yoobin Lee
Yoobin Lee on 22 May 2020 at 14:37
Yeah..You mean when l=num2cell(length(number)) right..?
Rik
Rik on 22 May 2020 at 15:38
No, I don't. You never mentioned using num2cell, so why would I assume you did? It looks to me like you need l=length(number). You said that returns an error. What exact error are you getting for that exact line of code.
If you change the code you're running without mentioning that, it is very difficult to help you. I can't see your screen. So now the previous 4 comments don't serve any purpose.

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Answers (1)

Raunak Gupta
Raunak Gupta on 26 May 2020 at 16:43
Hi,
As suggested by Rik in comments and tried by me length of the input string must not return any error statement. So cell2mat in the code can be removed because length will return a number not a cell array. Also, from the error message I can see that the number string that has been given as input must be empty. Try checking that number is correctly entered.
A small note is you are writing some lines using fprintf but I don’t see to which text file the lines are written.

  2 Comments

Rik
Rik on 26 May 2020 at 17:25
fprintf is also often used to write to the command window. As the documentation describes it is equivalent to fid=1;.

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