how to import asc.gz into matlab

New to matlab and in need of some very basic/remedial help (it is beyond me). Trying to import asc.gz data into matlab. I have 5 folders (grid points), each folder contains 11 files (months) worth of hourly data (~8000 hours per grid point). This is the current file name for one month of one grid point 'C:\Users\osoli\Desktop\GF-EC_Spec_Opr_201307_GP007203.asc'

Below is an screenshot of the data in one hour. Any help is greatly appreciated.

Answer 1

[Abderrahim. B]

For .gz file, you can use gunzip

Some examples can be found in this documentation page:

https://www.mathworks.com/help/matlab/ref/gunzip.html

For .asc files there is no function to that directly, but you can use fopen with fclose.

Example

fid = fopen('YouFileName.asc', 'rt');
C = textscan(fid, '%s%s%f%f', 'Delimiter',',', 'HeaderLines', 1);
fclose(fid);

Maybe you can use fgetl() as an alternative but in this case you will need to read line by line.

Hope this helps

[Walter Roberson]

If you read the first line of the .asc using fgetl() then you can parse out the Num Freqs and Num Direncs

Skip the next 5 lines.

Construct a format that is Num Freqs copies of '%f' .

Construct a format that is '%*s' followed by the above format, followed by another %*s

textscan() with that format with a count of 1. The two skipped strings (%*s) will be 'freq' and 'anSpec' . The numeric values will be... I am not sure what they mean? But there will be (26) of them.

Construct a format that is %f followed by the 26 %f followed by %f . textscan() with that format and a repeat count that is the same as Num Direncs .

Likewise you can read in the last two lines, if you need them. It is not obvious to me what they mean or how many entries per line there are.