physionet_ecg_text_exporter.m

MIT心电数据库读取程序 MIT的格式不能直接在MATLAB上使用 通过此程序转换成能直接应用在MATLAB上的格式

%**************************************************************************
% James Lamberg 10May05
% EE 5821 Biomedical Modeling
% Imports a .txt file created using rdsamp -p (or rdsamp-O-Matic)
% Plots the first two signals (columns 2 and 3 of the .txt file)
% Outputs a .MAT matrix containing the first two signals.
% The matrix can then be used in the Wavelets toolbox
%**************************************************************************
clc; clear all; close all;
%**************************************************************************
% Get Data & User Inputs
%**************************************************************************
File_Name = input('ECG Data File Name = ','s'); % ECG Text File
ECG_Data = load(File_Name);                     % Load The Text File
Time = ECG_Data(:,1);                           % First Column Of File
% If the input does not contain exactly two signals, modify the next two lines
% and later references to ECG_1 and ECG_2 accordingly.
ECG_1 = ECG_Data(:,2);                          % Second Column Of File
ECG_2 = ECG_Data(:,3);                          % Third Column Of File
Time_Adjusted = Time;                           % Time In Seconds Already                 
%**************************************************************************
% Plot Data
%**************************************************************************
plot(Time_Adjusted,ECG_1,'b');
hold on;
plot(Time_Adjusted,ECG_2,'r');
%**************************************************************************
% Fix Axes & Label
%**************************************************************************
Axis_X_Min = Time_Adjusted(1);
Axis_X_Max = Time_Adjusted(length(Time_Adjusted));
Axis_Y = ylim;
Axis_Y_Min = Axis_Y(1);
Axis_Y_Max = Axis_Y(2);
axis([Axis_X_Min Axis_X_Max Axis_Y_Min Axis_Y_Max]);
Plot_Title = strcat('ECG Data From: ', File_Name);
Plot_Title = regexprep(Plot_Title, '_', '-');
title(Plot_Title);
xlabel('Time In Seconds (s)');
ylabel('ECG Amplitude In MilliVolts (mV)');
%**************************************************************************
% Output Data File Into Current Working Directory
%**************************************************************************
File_Name = regexprep(File_Name, '.txt', '');
Axis_X_Min = num2str(round(Axis_X_Min));
save(strcat(File_Name,'_',Axis_X_Min) ...
    ,'ECG_1' , 'ECG_2', 'Time_Adjusted');
%**************************************************************************
% End Of Code
%**************************************************************************