what dose z represent in this graph?

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Aisha Mohamed 2022-8-26

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https://ww2.mathworks.cn/matlabcentral/answers/1787660-what-dose-z-represent-in-this-graph

评论： Torsten 2022-8-26

I am studying these graphs , and I really confused in some points here.

1- when we take arbitrary point in this figure for example as we can see in the first figure (x= -0.465, y=0.325, z=0.0084), we see that z>0 (greter than 0)

but when we calculate (cos(angle(-0.465+0.325i))) , we got it = -.8196 <0 (les than zero )

)

it is clear from this figure z does not equal the value of the function (cos(angle(-0.465+0.325i))), and

if z indicate to the sign of this function , why we got z>0 whereas the value of this function <o?

My questions are,

Is z in this figure indiacet to the value of (cos(angle(-0.465+0.325i))) or only tells us where (cos(angle(-0.465+0.325i))) positinve and negative? and why we find this contrast?

I will appreciate any help.