How to skip vectors and plot the n-vector with quiver ( 2D-vecor-vector field)

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Emerson De Souza
Emerson De Souza on 19 Oct 2011
Answered: ali veli on 6 Mar 2019
I want to know how to skip some rows by plotting a two-dimensional vector-field.
For example, let U and V be the coordinates and x and y the vector components as writen below:
U=[1 2 3 4 5 6 7 8 9 10];
V=[0 0 0 0 0 0 0 0 0 0];
x=[0 0 0 0 -1 1 0 2 1 2];
y=[1 2 -1 -2 0 0 0 0 1 2];
then I use quiver to plot the vector-field as follows:
Vector=[U' V' x' y'];
quiver(Vector(:,1),Vector(:,2),Vector(:,3),Vector(:,4),0,'LineWidth',2,'MaxHeadSize',.1); axis([0 12 -3 3])
Now it would be great if someone could tell me what I need to write to plot only every second, third or n-vector (row)
I thank you in advancoe for your help
Emerson

Accepted Answer

the cyclist
the cyclist on 19 Oct 2011
Put these two lines in before the quiver() command:
plotEveryThisMany = 2;
Vector = Vector(1:plotEveryThisMany:end,:)
This will index into "Vector" at every other element. This can be generalized to choose whatever elements you want to plot.
  2 Comments
the cyclist
the cyclist on 20 Oct 2011
You could do it like this:
xToPlot = x(1:10:end);
yToPlot = y(1:10:end);
plot(xToPlot,yToPlot)

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More Answers (2)

Sachini Pathirana
Sachini Pathirana on 14 Feb 2019
Edited: Sachini Pathirana on 14 Feb 2019
How can I use the same thing to select points in a 2D matrix? I have a mtrix of 695*1028 and i want to plot selected points using quiver.

ali veli
ali veli on 6 Mar 2019
Hi. How do I get this vector graphic with quiver3grafik.png

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