frequency domain in matlab

[dream123]

hi everybody

i have a signal m(t)=10+4cos(2*pi*t)+8cos(2*pi*2*t)+10cos(2*pi*10*t) i need to plot the
signal in frequency domain , i know how to plot in time domain but not in frequency if any one
can help me with that also how to do the same thing but using simulink instead of matlab please i have a
homework

 

[Tanzeel_Engineer]

first u take fourier transform ov ur signal.
then u achive a single spectrum ,thn u will able to plot ur signal in frequency domain

 

[kalaianand]

hi
you just apply Laplace transformation, and using the simulink library blocks, you can run the simulation. Its very simple.
blocks such as integration, transferfunction, scope, input signal block is enough to do all these stuffs.

 

[milind.a.kulkarni]

fft(m) then you can plot using figure,plot( abs(fft(m) and figure,plot(angle(fft(m))
Good Luck

 

[gemgem]

But laplace transform is for system analysis. (anand had posted). For a signal its Fourier. Besides the sampling frequency you apply is of tremendous significance. If the sampling frequency is not an integral multiple of anyone of the individual signals you added up, then you wont get what you anticipate. The time domain signal itself will look screwed up.