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How to add a line to scatter plot

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Hello! I created a scatter plot with maximum temperatures and daily data from the 1930s to 2020. I want to create a straight line in the 100F (for high temperature reference) in my y axis but I can't. I tried many codes from Matworks but no success.
Hope anyone can help me with this.
This is the plot I get and the code I used
figure('Name','Daily TMAX');
hold on
scatter(Date,DailyTMAX,'b','*')

Accepted Answer

Cris LaPierre
Cris LaPierre on 29 Aug 2021
Use yline.
scatter(rand(1,100),rand(1,100),'b','*')
yline(0.7)

More Answers (1)

Chunru
Chunru on 29 Aug 2021
Date = datetime([1930:2020], 1, 1);
DailyTMAX = randn(size(Date));
figure('Name','Daily TMAX');
hold on
scatter(Date,DailyTMAX,'b','*')
yline(max(DailyTMAX), 'r--')
  3 Comments
Cris LaPierre
Cris LaPierre on 29 Aug 2021
Just a comment that hold on is not necessary when using xline or yline. However, adding it has no adverse effect.
Also, it is best practice to always pair a hold on with a corresponding hold off.
Nuria Andreu
Nuria Andreu on 29 Aug 2021
Thank you Cris, I will practice more!

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