how can I read .dat file

I want to read data from .dat file, I use code:

A=fopen('gsmap_rnl.20010101.0.1d.daily.00Z-23Z.v6.5133.0.dat');
tline=fgetl(A)

but the result I receive like that

tline =

    'š^Â=öð=Pñç=ʸ“=”Q=.$>    ëê>jy‘>r.>•S->]\>Kï*>Êu5>Ʊ/>7>àÌ€>þ;¥>íë=>ëúS>û¡>¸

I think the data is encrypted.

I also try with

A=importdata('gsmap_rnl.20010101.0.1d.daily.00Z-23Z.v6.5133.0.dat');
A.data

but the ans is 5.

How can I read the file?

Thanks.

Answer 1

[Bjorn Gustavsson]

What is the data format? Do you have a file? Is it reasonably sized? Could you share it?

If you type:

more gsmap_rnl.20010101.0.1d.daily.00Z-23Z.v6.5133.0.dat

at the prompt in your standard shell what does the file look like? Does the file have some sort of header/meta-data? Do you have the format specification?

Does it work to simply use load:

>> load gsmap_rnl.20010101.0.1d.daily.00Z-23Z.v6.5133.0.dat

So many questions!

[Phan Duong]

https://drive.google.com/open?id=1nIZ3rGkXIBWHwpDaH-i9f1Y8e4IDifkh

This is the link to download file, The file heavy than 5mb so I can not attached here.

When I use load

Error using load
Unknown text on line number 1 of ASCII file
gsmap_rnl.20010101.0.1d.daily.00Z-23Z.v6.5133.0.dat
"š^Â=öð=Pñç=ʸ“=”Q=.$>".

For "more",

Error using more
Unknown command option.

[Bjorn Gustavsson]

more is a unix-command for looking at files.

Apparently your file is in some sort of binary format. For reading such files you need to know the format, or have a function that reads said format. The easiest way to get such a function or information about the file-format is from the people/organization from which you got the file. It might be possible to reverse-engineer the file-format (I'm doubtful about that). But I don't think you will not find anyone here that can do it "just like that" and for free.

HTH