# Matlab equation problem

1. Feb 1, 2008

### Wasper

Hello, I am trying to solve the following system of equations simultaneously with matlab:

0=(.3*cos(B)*cos(P)*cos(60))+(.2*sin(60))-(.3*sin(B)*sin(60))+S
0=(.3*cos(B)*sin(P))-.15
0=(.2*cos(60))-(.3*cos(B)*cos(P)*sin(60))-(.3*sin(B)*cos(60))

Unknowns are B, P, and S.

I have tried the following code which yields an answer:

syms B P S;

[B,P,S] = solve((.3*cos(B)*cos(P)*cos(pi/3))+(.2*sin(pi/3))-(.3*sin(B)*sin(pi/3))+S, (.3*cos(B)*sin(P))-.15, (.2*cos(pi/3))-(.3*cos(B)*cos(P)*sin(pi/3))-(.3*sin(B)*cos(pi/3)));

// note that the above is in one single line.
Unfortunately the answer is given to me in the form of another equation with extremely long numbers. I need matlab to give me an answer in the form of one number, how can this be done?

If all else fails I heard that this can be easily done in Maple, but I have no idea how to use it.

2. Feb 2, 2008

### Wasper

Never mind, one my friends figured it out, you just use the eval command to get a numerical answer. i.e. eval(B) to get B.

3. Feb 21, 2008

### unplebeian

Just out of curiosity, where does these equations come from? Robotics? I mean what is your system that is under investigation.

4. Mar 2, 2009

### vamsi krishna

x2/a2+y2/b2+z2/c2=1
how to plot this equation?
help me