Asked by lakshmi dwaraka
on 18 Jan 2019

i have got 4 .txt files which represents the data at 4 different times in a day, which iam attaching below. And i have to write a program such that it start reading from 17th line(after the heading pressure) in all the 4 files simulatenously. The secondlast column in all the file specifies the height and i have to find its median. so what i finally get should be the median of the height(second last colmn in each file) These 4 files should be calculated together. (For example : when these 4 files are placed sidebyside, we get 4 height data on the 17th line itself. find the median of these 4 data ..like that)

This process has to be repeated for the entire lines of the file.So finally we get about more than 500 median value. Can u pls help me write a code for this task? Iam new to matlab and have very little programming skill. ANY HELP WOULD BE MUCH APPRECIATED.PLS

Answer by Rik Wisselink
on 18 Jan 2019

Accepted Answer

This code should do the trick:

fnames={'1OCT3AM.txt','1OCT6AM.txt','1OCT9AM.txt','1OCT12AM.txt'};

lastcol=zeros(1,numel(fnames));

n_lines_skip=16;

FormatSpec='%d %d %d %d %d %d %d %d %f %f %f %f %f';

for n_file=1:numel(fnames)

fid=fopen(fnames{n_file},'r');

c=textscan(fid,FormatSpec,'HeaderLines',n_lines_skip);

lastcol(1:numel(c{end}),n_file)=c{end};

fclose(fid);

end

median_values=median(lastcol,2);

Rik Wisselink
on 18 Jan 2019

lakshmi dwaraka
on 18 Jan 2019

The loop i gave seems to overwrite the median_values. so only the last iteration value is getting as output.

Thanks for the help!

Rik Wisselink
on 18 Jan 2019

Glad to be of help. If my answer solved your question, please click the 'accept answer' button.

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