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Importing data from txt or Excel file in Matlab

Posted on 2009-07-12
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Last Modified: 2016-02-10
Hi,
I am trying to import data into Matlab. There are five columns: Date, Time, Open, High, Low, Last Price. I am trying to do this through "uiimport" (import wizard) or "xlsread" command. The problem is that Matlab reads the Date and Time column as "Textdata" even though the data is in Date/Time format. How can I convert the data into Date/Time within Matlab? I have attached a sample txt file. Please advise. Thanks in advance
gbp-samp.txt
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Question by:bose3
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10 Comments
 
LVL 9

Expert Comment

by:masheik
ID: 24838473
hi bose,
%read and display excel data
[data, textString] = xlsread('gbp-samp.xls');

here data represents only numeric data,and textString represents only strings in cell array

make sure that  the data is on  correct sheet number .If it is not please mention the sheet number like this,
[data, textString] = xlsread('gbp-samp.xls','sheetName');

for more information on xlsread refer here,

http://www.sgr.nada.kth.se/unix/software/matlab/Release_14.1/techdoc/ref/xlsread.html
0
 

Author Comment

by:bose3
ID: 24838629
The data is in a correct tab since there is only one tab in the whole spreadsheet. I have attached  the Excel file sample aslo.
gbp-samp.xlsx
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LVL 9

Expert Comment

by:masheik
ID: 24838750
i dont have matlab to check . can you show the output?
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Author Comment

by:bose3
ID: 24838819
I have posted two pics, one for the text data and the other is for numeric data. see attachment

numeric-data.PNG
text-data.PNG
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LVL 9

Expert Comment

by:masheik
ID: 24838834
this link can help you,
go to remarks and Handling Excel date values
http://matlab.izmiran.ru/help/techdoc/ref/xlsread.html
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Author Comment

by:bose3
ID: 24843477
I tried using ths script but no luck yet
[num, txt]=xlsread(GBP.xls);
tday1=txt(2:end, 1);
datestr(datenum(tday1, mm/dd/yyyy), mm/dd/yy);
tday1=str2double(cellstr(tday1));
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LVL 9

Expert Comment

by:masheik
ID: 24846587
as i already mentioned, i do not have matlab to check
can you check this out,
[xlsDates] = xlsread('test.xls','A2:A21');
mDates = datenum('30-Dec-1899') + xlsDates;
datestr(mDates,2)
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Author Comment

by:bose3
ID: 24851798
No luck with your script but I managed to find this http://www.mathworks.com/matlabcentral/fileexchange/18430. It seperates MM DD YYYY in seperate columns and keep them as numeric. Is there a way to join the columns after a split?
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LVL 15

Accepted Solution

by:
yuk99 earned 50 total points
ID: 24853137
Try the code below and check D structure.
D=importdata('gbp-samp.txt');
D.date = datenum(cell2mat([D.textdata(2:end,1) repmat({' '},size(D.data,1),1) D.textdata(2:end,2)]));
D.datestr = datestr(D.date,0);
D = rmfield(D,'textdata');

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Author Closing Comment

by:bose3
ID: 31602589
Awesome. Good work
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