Quiver plotting arrow length

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Giorgos Papakonstantinou
I want to plot a quiver plot of one arrow.
x=1;
y=1;
u=3;
v=4;
quiver(x,y,v,u)
I would expect that the arrow would start at point (1,1) and the length in the x direction would 3 while the length on the y direction would be 4.So the magnitude of the vector would be 5.
But this isn't the case. Can you explain me why? Thank you.

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the cyclist
the cyclist 2013-4-6
编辑：the cyclist 2013-4-6
Two things:
(1) It looks like you swapped the u and v arguments compared to how you actually want them, so I think you actually want
quiver(x,y,u,v)
(2) There is an automatic scaling that occurs to the arrow (which is described in the documentation). You can turn off that scaling:
quiver(x,y,u,v,0)
I believe that will result in the plot you expect.
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Giorgos Papakonstantinou
Giorgos Papakonstantinou 2013-4-6
Indeed I had swapped u and v values but if it wasn't your second comment I wouldn't know the answer. Thank you

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