How to plot a 2D vector-field and exclude zero-vectors (dots) in the graph?

I plotted a vector field as written below:

quiver(T(:,1),T(:,2),T(:,3),T(:,4))

where the variables

T(:,1) and T(:,2) are the x and y coordinates and

T(:,3) and T(:,4) are the x and y components.

However, many vectors have x and y components equal zero.

Thus, when I plot the field, many dots represents

the zero-vectors and disturb the visualization of

the field.

So I want to write some command lines

to exclude the plotting of the dots (zero-vectors).

I wonder if someone could help me with this

Thank you

Emerson

Answer 1

[Wolfgang Schwanghart]

How about:

I = ~(T(:,3)==0 & T(:,4)==0);
quiver(T(I,1),T(I,2),T(I,3),T(I,4));

cheers, Wolfgang

[Emerson De Souza]

Vielen Dank Wolfgang,

es hat genau funktioniert,

wie ich gewuenscht habe.

Gruesse,

Emerson