Index exceeds Matrix Dimension

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Jake 2019-12-11

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https://ww2.mathworks.cn/matlabcentral/answers/496084-index-exceeds-matrix-dimension

评论： Jake 2019-12-12

I'm following a comparatively larger code and I'm stuck in this section.

T1=num2str(TTime);
if length(T1)==9
     T1=['0',T1];
end
T11=datenum([str2double(T1(1,1:4)) str2double(T1(1,5:6)) str2double(T1(1,7:8)) str2double(T1(1,9:10)) str2double(T1(1,11:12)) str2double(T1(1,13:14))]);

Here, TTime is an array of numbers that specifies a date/time. (Ex: 20140705001529. i.e. year,month,date,hour,minutes,second) But I keep getting the error "Index exceeds matrix dimensions." Initially, str2double was replaced with str2num.

I know this snippet might not be enough to figure things out but any help from you guys is appreciated! If you have any suggestions, please do let me know.

Thanks in advance.

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Adam 2019-12-11

You should be able to find out why you are getting the error trivially using the Pause on Errors option from the Run menu. It will stop the code at the line of the error. Then you can simply look at the relevant components in the workspace or on command line. How to fix it is another matter, but simply to know what the cause is should be very simple.

Jake 2019-12-12

Yes. I get the line where the error happens and the error says "Index exceeds matrix dimensions."

I couldn't figure out the reason yet. I'm still a newbie so pardon me if I'm making naive comments :(

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回答（1 个）

Stephen23 2019-12-11

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https://ww2.mathworks.cn/matlabcentral/answers/496084-index-exceeds-matrix-dimension#answer_405920

编辑：Stephen23 2019-12-11

Simpler, more robust code:

>> N = 20140705001529; % Ugh... dates should not be stored like this!
>> S = sprintf('%d',N);
>> S(end+1:14) = '0'; % ensure 14 digits
>> T = datenum(S,'yyyymmddHHMMSS')
T =
     7.357850107523148e+05

Checking:

>> datevec(T)
ans =
        2014           7           5           0          15          29

Or even better using datetime:

>> T = datetime(S,'InputFormat','yyyyMMddHHmmss')
T = 
   05-Jul-2014 00:15:29

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Stephen23 2019-12-12

编辑：Stephen23 2019-12-12

".txt file has other data as well."

I don't see why that matters: textscan, readtable, etc. let you specify the formats for imported data, including importing dates as text or datetime. You should fix your file importing.

Jake 2019-12-12

Hm. I will try the suggestions. Thank you so much for the help.

By the way, Can you please explain to me what this line does, exactly? It is taken from the part of the code that I have added earlier (OP). I have an idea, of course, but I want your opinion. Again, apologies for the rookie questions.

T11=datenum([str2double(T1(1,1:4)) str2double(T1(1,5:6)) str2double(T1(1,7:8)) str2double(T1(1,9:10)) str2double(T1(1,11:12)) str2double(T1(1,13:14))]);

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