Solve equation without symbolic math toolbox

Hello ,

I'm trying to solve this equation :

0 = (U/r.^3)* sqrt(-2+((3*r.^3)*(Bx/U)))-B

U is a constant

Bx and B are column matrix

I would have as a result a value of r for each value of Bx and B

is it possible to do this without the Symbolic math toolbox ?

Thank you

Answer 1

[Chris C]

You can run this with two functions. The first function I have designated as myMain.m and it is written as..

r0 = rand(3,3);
fsolve(@myfun,r0)

The second function myfun.m is called by the first function by passing initial guesses of r as r0. I altered the way your equation above was written and wrote the function as...

function F = myfun(r)
Bx = rand(3,1);
B = rand(3,1);
U = rand(1);

F = (U)*sqrt(-2+((3*r.^3)*(Bx/U)))-r.^3*B;
end

Change the matrices to whatever numbers you need and it should work.

Good luck.

[Benoit]

Hello,

Thank you for reactivity, I've tried you're solution. Im new to fsolve function so maybe I am missing something but your answer gives me just one solution.

[Benoit]

Ok , i've got it.

Thank you