Import block data of a text file in Matlab

Question

Suppose I have a simple text file named "test.txt" of the format below

A=-1.1,2.2,-3.3,4.4B

My intention is to extract data -1.1, 2.2, -3.3 and 4.4 in Matlab from the text file.

How could I do that?

Ps: Note that the data is between a string "A =" and "B" and is separated by a comma.

I managed to extract the first data with the code below.

buffer = fileread('test.txt');
search = 'A=';
local = strfind(buffer, search);
value = sscanf(buffer(local(1,1)+numel(search):end), '%f', 1);

However, I'm not sure how to get the other values from the list that end in the string "B"

Are you looking for a function like textscan? It is designed for handling inputs with specific formats like those. For example, you would use something like textscan(string,"%*c %*c %f %f %f %f %*c", 'delimiter', ','). — mimocha
– mimocha, Commented Aug 2, 2020 at 0:01

Ahmet · Accepted Answer · 2020-08-02 10:44:17Z

1

Well, here is my answer:

clear; clc

path = 'test.txt';
fileID = fopen(path, 'r');
A = fscanf(fileID, '%s');
splitStr = regexp(A, '[a-zA-Z]', 'split');
splitStr = regexp(splitStr, '=', 'split');
splitStr = regexp(splitStr{2}, ',', 'split');
disp(splitStr{2})
fclose(fileID);

Output:

'-1.1'    '2.2'    '-3.3'    '4.4'

answered Aug 2, 2020 at 10:44

Ahmet

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Sardar Usama Over a year ago

While this code may answer the question, providing additional context either as comments with the code or as a separate paragraph regarding how and/or why it solves the problem would improve the answer's long-term value.

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