How can you determine if a vector in R3 belongs to a three dimensional region with its conditions?

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John Medina
John Medina 2018-5-20
评论： Jan 2018-5-20
For instance v=(1,2,3) satisfices x^2 + y^2 + z^2 < 1?

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回答（1 个）

Ameer Hamza
Ameer Hamza 2018-5-20
编辑：Ameer Hamza 2018-5-20
You can use this condition
sum(v.^2) < 1
It will return either true or false
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Jan
Jan 2018-5-20
@John: What you have posted is valid code already:
(x-x_0)^2 + (y-y_0)^2 + (z-z_0)^2 < 1
All you have to do is to replace "x" by "v(1)", "y" by "v(2)" and the same for "z".

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