Anyway to plot one point

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nas illmatic
nas illmatic on 17 Mar 2019
Is there anyway in Matlab to plot one point?
For example: plot(1,2) returns simply a blank plot
  1 Comment
per isakson
per isakson on 17 Mar 2019
Try
plot(1,2,'d')

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Accepted Answer

Nicholas Ayres
Nicholas Ayres on 20 Aug 2020
I'm a bit late to the party, BUT...
The issue this person is having is that the default plot type is just a "line" which connects points together. If there is only one point, it has nothing to connect it to. You need to add a marker.
Using any of the following characters after your x,y coordinates will produce these markers on your plot:
'o','+','*','.','x','s','d','^','v','>','<','p',h'
E.g.
plot(1,2,'.')
will just plot a dot at (1,2). You can combine this with line styles and colors to get a lot of variety in your plots. (my favourite is '.-', which puts dots at all the points and connects them together)
Specifically the section on "LineSpec" if you're short on time. It's worth the read as this provides a very simple way to pretty up your graphs a bit (and explains what the character inputs I listed above represent. This is the most common plotting method you're going to use and the syntax for the "LineSpec" works with a myraid of other plotting types, so it's worthwhile to know what's going on.

More Answers (3)

Sajeer Modavan
Sajeer Modavan on 19 Mar 2019
scatter(1,2)

MathWorks Support Team
MathWorks Support Team on 27 Sep 2022
By default, “plot” displays a line between two or more points with no markers. When there is only one point, nothing displays unless you specify a marker. To display a marker at one point, call the “plot” function and specify the marker using the “LineSpec” argument. For example, display the point (1,2) using a circular marker:
x = 1;
y = 2;
plot(x,y,"o")
You can select from a variety of different markers. For a full list, see the "Marker" property of the “Line” object.
Alternatively, call the “scatter” function, which displays a circular marker at the specified location by default:
scatter(x,y)

MathWorks Support Team
MathWorks Support Team on 27 Sep 2022
By default, “plot” displays a line between two or more points with no markers. When there is only one point, nothing displays unless you specify a marker. To display a marker at one point, call the “plot” function and specify the marker using the “LineSpec” argument. For example, display the point (1,2) using a circular marker:
x = 1;
y = 2;
plot(x,y,"o")
You can select from a variety of different markers. For a full list, see the "Marker" property of the “Line” object.
Alternatively, call the “scatter” function, which displays a circular marker at the specified location by default:
scatter(x,y)

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