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

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.
the cyclist
the cyclist on 20 Oct 2011
You could do it like this:
xToPlot = x(1:10:end);
yToPlot = y(1:10:end);

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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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