When creating an app, how do you plot points on top of a line on a UI axis?

% We will write the following code in the button push function,
% since we want the push of this button to 1.) 
main_axes = app.UIAxes;
weekval = app.WeekDropDown.Value;
drugval = app.DrugDropDown.Value;
temp_time = app.ecg_data.DATA.(weekval).(drugval).Time;
temp_ecg = app.ecg_data.DATA.(weekval).(drugval).ECG;
[peaksx, peaksy] = findpeaks(temp_ecg);

hold(main_axes, 'on' )

%This plots the line
plot(main_axes,temp_time,temp_ecg)
hold(main_axes, 'off' )
hold(main_axes, 'on' )
%This plots the points
plot(main_axes, peaksy,peaksx, '.');
hold(main_axes, 'off' )

Answer 1

[dpb]

% We will write the following code in the button push function,
% since we want the push of this button to 1.) 
main_axes = app.UIAxes;
weekval = app.WeekDropDown.Value;
drugval = app.DrugDropDown.Value;
temp_time = app.ecg_data.DATA.(weekval).(drugval).Time;
temp_ecg = app.ecg_data.DATA.(weekval).(drugval).ECG;
[peaksx, peaksy] = findpeaks(temp_ecg);

%This plots the line
plot(main_axes,temp_time,temp_ecg)
hold(main_axes, 'on' )
%This plots the points
plot(main_axes, peaksy,peaksx, '*');

Don't reset hold until ready to draw a new figure/axes/plot...do that only at a beginning or if give user the option to clear the axes.

The above should have worked, likely just couldn't see the marker using just a '.' with no larger marker size than default.

The '*' should show up; salt to suit with color/size/marker/etc.,...

Answer 2

[Image Analyst]

Try xline or yline

% Get limits of axes
xl = xlim
yl = ylim
xine(xl(1), 'Color', 'r', 'LineWidth', 5) % Draw line along left edge of axes box.
xine(xl(2), 'Color', 'r', 'LineWidth', 5) % Draw line along right edge of axes box.
yine(yl(1), 'Color', 'r', 'LineWidth', 5) % Draw line along bottom edge of axes box.
yine(yl(2), 'Color', 'r', 'LineWidth', 5) % Draw line along top edge of axes box.