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VEX function clarification

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I have a bunch of points, & I want to run some lines on just ONE specific point's attribute & I'm lost on how to grab a single point by it's point number or grab one of it's attributes/attribute components! For Example, I want to store the N vector attribute of point number 19 in a new vector variable called foo. Or grab the N.y component of point 19's Normal attribute & store it in a float variable named bar. I'm not a programmer & the help references for these type of functions have no practical examples so it's a bit difficult to put it in context... I'd appreciate any help. Thanks!  

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vector foo = point(0, "N", 19) // if you need it as a variable

v@foo= point(0, "N", 19) // if you need it as an attribute

Edited by fuat

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