How can I add markers into my plot?

Hallo everyone,

I would like to ask you how to add some kind of marker to hightlight an area I want to emphasize. I´m trying to plot a signal in frequency domain via below and I would like to add some thin line (or something like that) on...lets say 49,4 Hz and on about 20 other frequency values. There´s probably a way to draw it line by line, but I´m looking for some easier way, because I´m about to do the same on about 10 other plots.

Thanks in advance,

Patrik

[Birdman]

Can you share your data in a mat file?

[Patrik Soukup]

I definitely can, but I´m not sure what exactly do you want me to share. This plot is a part of fft transformed from 9M current instantaneous values. So what exactly do you need sir? :)

[Birdman]

I need the transformed data.

[Patrik Soukup]

https://www.dropbox.com/s/95a69s87p06coyg/matlab2.mat?dl=0

Answer 1

[Walter Roberson]

If you have the stats toolbox then perhaps use refline()

You could also consider using fill() and setting the AlphaData of the returned patch to make it semi-transparent.

[Patrik Soukup]

Thanks for your answer sir, but unfortunately I´m kind of new to Matlab and I don´t know what stats toolbox is. In fact, I would highly appreciate some code (example) to start with other those from help.