How do I find the max value and the unknown variables of f=-cos(the​ta_A).*cos​(theta_B)-​sin(theta_​A).*sin(th​eta_B).*si​n(phi_A).*​sin(phi_B)​-cos(phi_A​).*cos(phi​_B).*sin(t​heta_A).*s​in(theta_B​)

Where theta_A, theta_B, phi_A, phi_B are unknown variables. So i put the range for theta =0:0.01:pi and phi =0:0.01:2*pi. Please tell me how to put the code , i would be appreciate. Thanks

Answer 1

[Torsten]

help fminsearch help fminunc help fminbnd

Best wishes

Torsten.

Answer 2

[Torsten]

One solution is

theta_A=pi, theta_B=phi_A=phi_B=0

Best wishes

Torsten.

[Raja Emlik]

Hi How they are 0? As i need to find max value which should be 2*sgrt(2). Could you please tell me the right command how to find the max value of multi-variable function. Thanks so much.

[Torsten]

As far as I can see, your expression can never exceed the value of 1, and this value is attained for theta_A=pi, theta_B=phi_A=phi_B=0.

But you can test this using one of the MATLAB tools I mentionned in my first response.

Best wishes

Torsten.