Reading large gz files without unzip

I need to go into a very large dataset that is made of many large .gz files (each of 1GB). In the UNIX shell it is possible to explore them without unzipping using the command:

gzcat

Is there something equivalent for Matlab?

Answer 1

[Jan]

What about

system('gzcat ...')

?

[Davide]

Yes, this is a possibility, nevertheless the "system" command does not generate a stream that Matlab can manage.

[Jan]

You want to "explore" the files. So why do you need to create a "stream"?

[Davide]

Sorry, probably I did not explain very well what I have to do. It deals with financial data, each gz file has the structure (I am attaching only the first two lines)

#RIC,Date[G],Time[G],GMT Offset,Type,Price,Volume,Bid Price,Ask Price,Exch Time

A.N,18-FEB-2014,14:31:00.610,-5,Trade,55.47,48939,,,14:31:00.565

A.N,18-FEB-2014,14:31:00.610,-5,Quote,,,55.43,55.47,

and I want to, for example, interpolate the column "Price" on a fixed time grid, using previous tick interpolation. So I need to use for loops to operate on the file.

Answer 2

[Walter Roberson]

You may wish to adapt the code in http://uk.mathworks.com/matlabcentral/fileexchange/32089-listzipcontents

[Davide]

I'll try, thank you very much.

[Sivakandan Mani]

Hi Davide,

could you processes your data in matlab,

I have similar kind of problem. If you dont mind could you help me?

With regards,

Siva