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Problem with function

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Paolo Della Vedova
Paolo Della Vedova 2011-9-29
关闭： MATLAB Answer Bot 2021-8-20
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
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Paolo Della Vedova
Paolo Della Vedova 2011-9-30
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
Walter Roberson 2011-9-30
What strange result does it give?
Have you tried
simple(y0)
after the solve() ?

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回答（2 个）

Ajay Kumar
Ajay Kumar 2011-9-29
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.
Walter Roberson
Walter Roberson 2011-9-29
fzero(@(x) R*cos((pi*x)/l)^2 - 50, 0)

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