How to put marker at specific x value on line?

Hi,

I have plotted the knee joint angle during 1 gait cycle for 5 different subjects. I want to put markers that correspond to the times during the gait cycle when a specific muscle reaches its maximum activation. I determined the x-values (i.e. times during the gait cycle) when this muscle activation occurs by plotting the muscle activation during the gait cycle separately, visually inspecting the plot, and creating a vector with the x-values corresponding to the timepoints of maximum muscle activation for each subject. My problem is I want to add these markers to my knee joint angle graph, but I don't know how to get them to "fall" on the previously plotted knee joint angle line. In other words, I don't know the corresponding y value. Attached is a picture of the gait cycle graph. The x values where I want markers for are:

light blue = 94.6309

green = 95.9732

purple = 38.255

dark blue = 97.3154

yellow = 96.6443

I specified which color for which marker since I changed the color order. Any advice would be greatly appreciated, thank you!

Answer 1

[Matt J]

There seem to be a lot of threads about that lately,

https://www.mathworks.com/matlabcentral/answers/1696205-how-to-indicate-the-maximum-value-in-the-plotted-curve-in-matlab?s_tid=srchtitle

https://www.mathworks.com/matlabcentral/answers/1696320-indicating-the-maximum-value?s_tid=srchtitle