My scatter plot points aren't showing up on my main line plot.

I am attempting to callout the peak on both line plots by plotting the data, then using the (max) function to callout the max values of both the x and y values for each line.

How should I call the "t value" that is at the same point as the "max s" value for s2 and s3? I think max(t) is what is throwing off my scatter plots. t, s2, and s3 are all single cloumn matricies of different lengths.

%finding max values for t & s

tmax = max(t);

s2max = max(s2);

s3max = max(s3);

scatter(tmax,s2max,'o','r','LineWidth',1.5)

scatter(tmax,s3max,'o','r','LineWidth',1.5)

Answer 1

[Star Strider]

Perhaps something like this —

[s2max,s2idx] = max(s2);

[s3max,s3idx] = max(s3);

figure

hold on

scatter(t(s2idx),s2max,'o','r','LineWidth',1.5)

scatter(t(s3idx),s3max,'o','r','LineWidth',1.5)

hold off

.

[Dr. Doom]

That did the trick, thanks Star!

[Dr. Doom]

Any chance you know how I could also callout what the corresponding max (t) value is for each of those points so I can label it? I got s2max and s3max from removing the semicolon but not the "t values"

[Star Strider]

As always, my pleasure!

The ‘t’ values corresponding to those points are ‘t(s2idx)’ and ‘t(s3idx)’ respectively, so if you want to label them on the plot, perhaps something like this would work —

text(t(s2idx), s2max, sprintf('\\leftarrow s2_{max} = %.1f, t = %.1f', s2max, t(s2idx)), 'Horiz','left', 'Vert','middle')

text(t(s3idx), s3max, sprintf('\\leftarrow s3_{max} = %.1f, t = %.1f', s3max, t(s3idx)), 'Horiz','left', 'Vert','middle')

I didn’t test those, however they should work. Change those to print out what you want. (If there are problems with them or if you want them to do something else or use the LaTeX interpreter, I will change them appropriately.)

.

[Dr. Doom]

Thank you! (x2)

[Star Strider]

As always, my pleasure!

[Dr. Doom]

Hey Star,

So on my second plot I ran into the same issue I originally had. Maybe since the "max t" value is in a different place? Here is my plot and the code I used from above. Thanks for any feedback you have.

[Dr. Doom]

Nevermind I figured it out... (D'oh!)

I used t_3 instead of just t as my varialbe.

[Star Strider]

No worries!