Why does the QUIVER command in MATLAB display the wrong vector length?

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MathWorks Support Team
编辑： MathWorks Support Team 2021-11-17
When I execute the following code in MATLAB:
quiver(0,0,3,0);
the resulting plot does not display an arrow from (0,0) to (3,0).

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MathWorks Support Team
编辑：MathWorks Support Team 2021-11-17
This enhancement has been incorporated in Release 2006a (R2006a). For previous product releases, read below for any possible workarounds:
The QUIVER function in MATLAB autoscales vectors it draws, as described in the documentation.
https://www.mathworks.com/help/matlab/ref/quiver.html
As this indicates, you can obtain correct lengths by using a fifth argument, a scaling parameter. The following code displays the expected arrow from (0,0) to (3,0):
quiver(0,0,3,0,0);
quiver(0,0,3,0,'AutoScale','off')
Alternatively, one of the following three commands will work:
quiver(0,0,3,0,1);
quiver(0,0,3,0,'AutoScaleFactor',1)
The latter 2 are autoscaled and a scaling factor of 1 is applied.

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