Hi, I need a simple function written in MATLAB that: 1. asks the user for a .txt

Question

Hi, I need a simple function written in MATLAB that:

1. asks the user for a .txt file input that accepts the file name as a string.

2. Loads the data. The function needs to store the time step (as shown below) in a variable (output it), and needs to store the subsequent values (lines 2 to the end) in a vector called ecg_values that can be used in later calculations and plotting.

Lead Number 1 Time Step .001 Data Points 6001 3.1000000e-03 7.7000000e-03 1.2400000e-02 1.7500000e-02 2. 2800000?-02 2.8500000e-02 3.4500000e-02 4.0900000e-02 4. 7600000?-02 5.4600000e-02 6.1900000e-02 6. 9500000?-02 7.7400000e-02 8.5500000e-02 9. 3900000?-02

Explanation / Answer

Assuming that the number of data points following to the first line are the last numerical value in first line i.e. for the given case total points following the first line will be 6001

Hence, the required script is as the following:

Please be extremely careful while copying/re-writing the code.

%========================================

clear all;
clc;
% File name as string input
filename=input('Please provide the filename: ','s');

% File open
fid = fopen(filename);

% Header scan for storing time step
value = textscan(fid,'Lead Number %d Time Step %f Data Points %d');

% Extracting time step and total count of numbers
time_step=value{2};
total_val=value{3};

fprintf(' The time step values provided in the file is: %f ',time_step);
clear value;

% Scanning the file for the numeric values following the header
value = textscan(fid,'%f','Delimiter',' ');

% Creating the ecg_values variable as per the requirement
ecg_values=value{1};

%======================================================

Sample output:

Please provide the filename: a.txt

The time step values provided in the file is: 0.010000

Hope this helps!

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