dataset

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Chiara Modenese
Chiara Modenese 2011-4-12
Hello,
would you please give me an example of use of dataset? I am used to structures now, but I think that dataset could be easier to handle for my purposes. Say that I would like to see how dataset works having to import a simple txt data like:
a b c
1 2 3
4 5 6
7 8 9
Thanks for your example. Chiara

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回答（3 个）

Matt Tearle
Matt Tearle 2011-4-12
x = dataset('file','simple.txt','delimiter',' ')
x.Properties.VarNames
x.a
plot(x.a,x.b,'o-')
the cyclist
the cyclist 2011-4-12
Have you read the example in the documentation?
>> doc dataset
Chiara Modenese
Chiara Modenese 2011-4-12
Thanks. Could you tell if it is also possible to create an array of dataset arrays? Having several files to deal with, I need to be able to write loops easily.
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Chiara Modenese
Chiara Modenese 2011-4-13
Ok. I see the point, and in the end it turns out to be not so different from the use I do of structures. I was trying to make some comparisons between dataset and structures, to see pros and cons. In my case, I have data files with also different formatting so I may have different variables. Your suggestion is good though, thanks.
Oleg Komarov
Oleg Komarov 2011-4-13
In general a DBMS is much better than MATLAB at managing data (dataset arrays try to emulate the functionalities of a database). In the long run I would invest time to learn SQL to manage data and interface it with MATLAB whenever computational complexity arises.
In my experience I started using only MATLAB and ended up executing 80% of descriptive statistical analysis with SQL Server!

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