Quiver does not show any arrows

Hello all of you,

Iam trying to use a quiver plot for the first time.

I have a matrix uv(2x251x251) with an uv vector associated to x and y coordinates.

when i try to use

quiver(uv(1,:,:),uv(2,:,:))

i dont see anything. No points or Arrows.

When i try to plot just one vector for just one point with

quiver(uv(1,1,1),uv(2,1,1))

the Arrow shows up and i can see it.

my u and v values range from -1 to 1.

Iam realy new to Matlab and i dont get why i can see something when i plot one vector but not when i try to plot all of them.

Hope you can help me.

Answer 1

[Mischa Kim]

You need to use

quiver(squeeze(uv(1,:,:)),squeeze(uv(2,:,:)))

to turn the 1x251x251 object uv(1,:,:) into a 251x251 matrix.

[Marcel]

Thank you, that solved the problem.

[Mischa Kim]

As a side note, when using

quiver(uv(1,1,1),uv(2,1,1))

you create 1x1 matrices from uv by completely specifying the vector elements. That's why you see the arrow in this case.