How to put 2 vectors when the inner product is available

(x,y) = 2x1y1-3x1y2-3x2y1+5x2y2-x2y3-x3y2+4x3y3

with u =(1; 1;2), v=(2;1;-1)

for me, i know that making a doc product with doc(u,v), however this problem have inner product availably.

[James Tursa]

Your question is not clear. Are you trying to rewrite the given expression in terms of dot products? Or ...?

[Cuong Ho Chí]

i mean how to calculate an product of u and v when it doesn't have standard product

[Cuong Ho Chí]

how to express it in matlab

Answer 1

[Cuong Ho Chí]

i mean how to calculate product of u,v when it doesn't have an standard product

Answer 2

[James Tursa]

I'm not at all sure what you mean. Maybe this is what you want:

result = 2*u(1)*v(1) - 3*u(1)*v(2) - 3*u(2)*v(1) + 5*u(2)*v(2) - u(2)*v(3) - u(3)*v(2) + 4*u(3)*v(3);

[Cuong Ho Chí]

thank you so much

Answer 3

[Cuong Ho Chí]

thank you so much