How I can code ||x||=1 with first component x1>0, x is vector

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MAK 2018-9-25

回答： Dimitris Kalogiros 2018-9-25

How I can code |x|=1 with first component x1>0, x is vector

James Tursa 2018-9-25

Please provide more detail. What problem are you solving with the code? How will this be used downstream in your code? Etc.

Dimitris Kalogiros 2018-9-25

You can use norm or vecnorm .

For example (and by usage of symbolic math toolbox):

clc;close all; clc
X=sym('X', [1, 3])
eq=norm(X)==1

You will receive:

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