Select/ Short rows from ASCII files
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Hello,
I work with very large ASCII file, as the below sample
STOCK DATE TIME PRICE
ETE 04/01/2010 10170000 18.54 430 Big Cap
ABC 04/01/2010 10190000 18.34 200 Big Cap
YYY 04/01/2010 10200000 18.34 100 Big Cap
which is TAB delimited and sorted by TIME as above.
How can I select rows with respect to the column 'STOCK'
for instance selecting only the rows for the stock 'ABC' ?
In case these are not then sorted by time, how can I sort them by TIME?
Many thanks in advance.
Panos
采纳的回答
Fangjun Jiang
2011-9-14
Import your ASCII file first. If you could make the data like the format below, it's straightforward to use ismember() and sort() function to achieve what you want.
Data={'ETE' '04/10/2010 10170000' 18.54 430 'Big Cap';
'ABC' '04/01/2010 10190000' 18.34 200 'Big Cap';
'YYY' '04/01/2010 10200000' 18.34 100 'Big Cap';
'ABC' '04/02/2010 10190000' 18.54 300 'Big Cap';}
Ind=ismember(Data(:,1),'ABC')
Stock_ABC=Data(Ind,:)
[Trash,Ind]=sort(datenum(Data(:,2),'mm/dd/yyyy HHMMSSFFF'));
Stock_Sorted=Data(Ind,:)
2 个评论
Pap
2011-9-14
Fangjun Jiang
2011-9-14
I don't mean to manually type into that format. You can use uiimport(),importdata(), xlsread() or textscan() to import your ASCII file and then make your data into a cell array.
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Pap
2011-9-14
0 个投票
1 个评论
Fangjun Jiang
2011-9-14
Yes. xlswrite() can write a cell array to an Excel file which I think would be better for this type of information. You can also use csvwrite(), dlmwrite() to write to an ASCII text file.
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