How to skip vectors and plot the n-vector with quiver ( 2D-vecor-vector field)
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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
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채택된 답변
the cyclist
2011년 10월 19일
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.
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the cyclist
2011년 10월 20일
You could do it like this:
xToPlot = x(1:10:end);
yToPlot = y(1:10:end);
plot(xToPlot,yToPlot)
추가 답변 (2개)
Sachini Pathirana
2019년 2월 14일
편집: Sachini Pathirana
2019년 2월 14일
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.
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