help in exp function in matlab

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Mohammed EL_Kenawy

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Hey

Can you help me plz to plot the output of this equation using Matlab



the vertical axes is ...... Magnitude of the output in dB
the Horizontal axes is the angle in degrees

could I have the code of this

I really need it

help me
 
Last edited:



This is a real function.

Only three terms: m= -1,0,1 ==> Σ(...) = 1 + 2*cos(pi*cos(θ))
 

thank you Eduardo but how about theta .
I want it in degrees 0 20 40 60 .... 180 on xlabel but i have an error
I can't fix the dimensions of length
can u help me ?
 

Mohammed EL_Kenawy said:
thank you Eduardo but how about theta .
I want it in degrees 0 20 40 60 .... 180 on xlabel but i have an error
Click to expand...

Something like this ?

Code: 
t = 0:.5:180 ;                  % 0.5° step
y = 1+2*cos(pi*cos(t*pi/180));  % pi/180 adjust argument to radians
plot(t,20*log10(abs(y)))        % 20*log10(abs(...  convert to decibels
xlabel('Degrees')               % axis labels
ylabel('dB')
 
Thank you very much Eduardo

for this equation i want to plot E(indB) versus theta (in degrees)


say W =[ 0 0.2857 0.5714 0.8571 0.8571 0.5714 0.2857 0]

I want the code to see if it give the figure

plz I need the code my friend
 

It's the same, just take care with the matrix multiplication.

Code: 
beta = 1 ; d = 1 ;   % Dummy values

W =[ 0 0.2857 0.5714 0.8571 0.8571 0.5714 0.2857 0] ;
m = 1:8 ;
angle = 0:.5:180 ;   % 0.5° step
z = exp(i*beta*d*m'*cos(angle*pi/180)) ;

plot(angle,20*log10(abs(W*z)))
xlabel('Degrees')
ylabel('dB')
 
@Mohammed EL_Kenawy: Perhaps you could post your matlab code so that someone can give some hints.
 

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