MATLAB VECTOR FIELDS j COMPONENT

Hi everbody , I am trying to create a function tthat take a vector fforce field from user and seperate its i j k components.

ı am thinking to take the input as symfun and subs ,for example (i=1,j=0,k=0) for i component but as you can see matlab reads j as i (input was xi+yj+kz and the output of force_field variable xi+yi+zk) how can ı fix it ?

Answer 1

[VBBV]

syms x y z i j k t r
f = dot([x y z],[i j k])

f = 

ff =  symfun(f,[x y z i j k])

ff(x, y, z, i, j, k) = 

subs(ff,{x y z},{1 0 0})

ans(x, y, z, i, j, k) = 

i

[VBBV]

use dot product function instead

[Talha Yagli]

thank you , but how can ı get the f as an input form the user

[VBBV]

When the user enters inputs in form of

[x y z i j k]

It is read into say X , then do

f = dot(X(1:3),X(4:6))