MATLAB: Reading/writing text file while excluding header

headertext file

I'm new-ish to MATLAB, and until now I've only used it to perform Matrix Displacement Method analyses for structures classes.

I have large earthquake record files that I would like to read in. They have headers (4 lines) that I would like to omit, and 5 columns of acceleration data (the number of rows depends on the size of the earthquake record). Is there a way to read in this data and then write the array to a new text file? I've spent hours pouring over past forum topics, and I haven't had any luck with my attempts.

The closest I've come is to use importdata(), but the 'data' array returns dimensions that don't seem right (that, and I don't know how to access the elements of a structured array like 'data').

Hints would be much, much appreciated!

Best Answer

FID=fopen('test_quake.txt');
datacell = textscan(FID, '%f%f%f%f%f', 'HeaderLines', 4, 'CollectOutput', 1);
fclose(FID);
A = datacell{1};

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Think of fid as a pointer that tells textscan where to read from. It moves its way byte by byte through the file until it reaches the end. When you call textscan for Headerlin1, it's at the end of the file. Your option, then, is to either read in Headerlin1 first, and then continue with reading in the rest of the file, or use frewind to bring fid back to the beginning of the file before reading in the first line.

You can get textscan to skip the text before a number by placing that text right before the format spec: Lat:%f

Option 1

fid=fopen('aa__file002.txt');
Headerlin1 = textscan(fid,'Lat:%f Lon:%f %*[^\n]','Delimiter',','); % extra bit reads to the end of the line
A = textscan(fid,'%s %s %f','HeaderLines',5); % read file;

fclose(fid);

Option 2

fid=fopen('aa__file002.txt');
A = textscan(fid,'%s %s %f','HeaderLines',6); % read file;
frewind(fid);
Headerlin1 = textscan(fid,'Lat:%f Lon:%f','Delimiter',',');
fclose(fid);

Best Answer

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