angle() further help

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Nicholas Salce
Nicholas Salce 2017-3-22
编辑： Rik 2017-3-22
I am trying to use the angle function in order to calculate the angle of complex numbers. I have been trying to understand how the angles of complex co-ordinates in the 3rd quadrant are calculated? The example I have been using is z= -2 - 5i, the angle function (and rad2deg()) gives an answer of -111.8014. I don't understand where this figure comes from, can anyone shed some light on this?

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回答（1 个）

KSSV
KSSV 2017-3-22
angle gives you the value of inverse tan of imaginary values divided real value.
z= -2 - 5*1i ;
atan(imag(z)/real(z))
  2 个评论
Rik
Rik 2017-3-22
编辑：Rik 2017-3-22
To avoid confusion: the imaginary and real parts. In this case that would be
atan( (-5) ./ (-2) )
Thanks for spotting my mistake Adam ;)
Adam
Adam 2017-3-22
编辑：Adam 2017-3-22
Or
atan( (-5) ./ (-2) )
to avoid confusion in the clearing up of the confusion :-)

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