Read specified data from text file and plot it using Matlab

Question

I have a text file containing following data:

2n10
B127 mg/dL  01:45 pm 3 of January
E83 mg/dL  10:03 am 3 of January
H97 mg/dL  11:05 pm 2 of January
K80 mg/dL  06:00 am 3 of January
P118 mg/dL  08:15 am 3 of January
S97
S80
S118
S81
S87
S85
S89
S82
S83
S127
a

And I want to read some (specified) data from this text file and then plot it. The data that I want to read and plot is:

S97
S80
S118
S81
S87
S85
S89
S82
S83
S127

How can I do that ?

Hints:

First part of file:

2n10
B127 mg/dL  01:45 pm 3 of January
E83 mg/dL  10:03 am 3 of January
H97 mg/dL  11:05 pm 2 of January
K80 mg/dL  06:00 am 3 of January
P118 mg/dL  08:15 am 3 of January

Always consists of six rows, so the first line that I actually want to read and plot starts from the seventh row.

Second part of file (which I want to read and plot) may contain an arbitrary number of rows, but every row starts with character S and the end of file is always marked by character a.

Please help me ^_^

Thanks and best regards.

Those data to be neglected always have more than one word in those rows? — Divakar
And the valid rows (that are to be considered for plot) are always single string/word? — Divakar

lackadaisical lackadaisical · Accepted Answer · 2014-04-28T13:55:03

A solution might be this one:

fid = fopen('test.txt');

tline = fgets(fid);
while ischar(tline)
    parts = textscan(tline, 'S%d');
    if numel(parts{1}) > 0
        disp(['S' num2str(parts{1}) ])
    end
    tline = fgets(fid);
end

fclose(fid);

Basically, it opens the file and searches for lines with the format:

S< number >

For each one of these lines, it scans the number and prints the string without the newline.

Hope this helps.

Read specified data from text file and plot it using Matlab

1 Answers