how do I introduce vector and differentiate it?

Question:how do I introduce vector and differentiate it?

Posted: m_magooda 20 Product: Maple

April 09 2018

Hello

I was trying to introduce vector r_vec that has 3 components in x,y,z

I've attached my file, I've 2 questions here

first, why isn't the vector shown in as r_vec = () ei + () ej + () ek instead appears as a column vector

second, why doesn't it accept differentating

thank you

r := sqrt(VectorCalculus:-`+`(x^2, VectorCalculus:-`+`(y, VectorCalculus:-`-`(VectorCalculus:-`*`(z, 1/VectorCalculus:-`*`(tan, alpha))))^2))

(x^2+(y-z/(tan*alpha))^2)^(1/2)

(1)

(2)

(3)

$Matrix(3, 1, {(1, 1) = sqrt(x^2+(y-z/(tan*alpha))^2)*`cosθ`, (2, 1) = sqrt(x^2+(y-z/(tan*alpha))^2)*sin*arctan((y-z)/x)+z*cos/sin, (3, 1) = z})$

(4)

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