Hello Paul,
To implement the scaling and formatting requirements for your ECG data visualization, you can use the following suggestions and get the desired result:
- Axis Limits: Sets the X-axis to display from 0 to 5 seconds and the Y-axis from -1 to 1 mV, accommodating the simulated data range.
xlim([0 5]);
ylim([-1 1]);
- Y-Axis Configuration: Sets major ticks every 0.1 mV and minor ticks every 0.01 mV, with the label "Voltage (mV)".
% Configure Y-axis ticks and labels
yticks(-1:0.1:1);
ax.YAxis.MinorTick = 'on';
ax.YAxis.MinorTickValues = -1:0.01:1;
ylabel('Voltage (mV)');
- It seems like the axis labels are not displaying because the "xticklabels([])" and "yticklabels([])" commands are clearing the labels on the "X" and "Y" axes. To fix this and display the time and voltage labels on the axes, you should remove or comment out those lines.
Please refer to the documentation of "xticklabels" for more understanding: https://www.mathworks.com/help/matlab/ref/xticklabels.html#bvaeadq-1
Now, combining the above suggestions and implementing them gives the following:
(Note: Using a randomly created dataset to simulate results, please use your dataset here.)
clear
addpath(genpath('..')); % add parent directory
% load 1 lead ECG signal
data = readtable('ecg_sample.csv', 'Delimiter', ',');
set(gcf,'PaperUnits','centimeters');
set(gcf,'PaperSize',[29.7 21]);
fig = gcf;
fig.PaperUnits = 'centimeters';
fig.PaperPosition = [0 0 29.7 21];
fig.Units = 'centimeters';
% figure;
% ax1 = subplot(1,1,1);
plot(data.timesincestart(1:8000), data.leadVoltage(1:8000),'LineWidth', 2);
% Set grid and ticks grid on grid minor
xlim([0 5]);
ylim([-1 1]);
grid on
grid minor
set(gca, 'GridLineStyle', '-'); % Durchgezogene Linie
set(gca, 'GridAlpha', 0.2); % Transparenz (0 bis 1)
set(gca, 'GridColor', 'k'); % Farbe auf Schwarz setzen
% X-Achse: 1 mm = 0.04 s (25 mm/s)
% 1 small square corresponds to 1/50 of a second, which is 0.02 s.
xticks(0:0.1:5);
ax = gca;
ax.XAxis.MinorTick = 'on';
ax.XAxis.MinorTickValues = 0:0.02:5;
xlabel('Time (s)');
% Y-Achse: 1 mm = 0.1 mV (10 mm/mV)
% 10 small squares correspond to 1 mV
% 1 large square corresponds to 0.5 mV
yticks(-1:0.1:1);
ax.YAxis.MinorTick = 'on';
ax.YAxis.MinorTickValues = -1:0.01:1;
ylabel('Voltage (mV)');
% sace and open pdf
print(fig,'myFigPDF','-dpdf','-r1200');
% Uncomment the following line to get the pdf output (attached)
% winopen('myFigPDF.pdf')
I hope it helps your query!
