Problem with function

HI Guys,

i have to solve the following equation with matlab (numerically) but i don´t get any solution...could you help me out??

50 = R*cos^2((pi*x)/l)

I have all the parameter and i just need to solve it for x...

Thanks

[Wayne King]

Please show the MATLAB code you have written to attempt to solve for x.

[Paolo Della Vedova]

Hi, the code is the following:

syms x

equ = 50 - Rpiu*(cos((pi*x)/l)*cos((pi*x)/l));

y0 = solve (equ,x)

and it gives a strange result...

[Walter Roberson]

What strange result does it give?

Have you tried

simple(y0)

after the solve() ?

Answer 1

[Ajay Kumar]

Matlab would not return the value of X if you do the following:

50=R*cos^2((pi*X)/I)

You can probably try:

%Assign values

R = 1; % Replace these values with desired value

I = 1;

X= (I/pi)*acos(sqrt(50/R))

This makes sure that the result you want is on the Left hand Side and all the variables on the right hand side are already initialized.

Answer 2

[Walter Roberson]

fzero(@(x) R*cos((pi*x)/l)^2 - 50, 0)