Any idea on how to build this function?

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Alessandro Longo
Alessandro Longo 2017-11-24
评论： Alessandro Longo 2017-11-24
Hello forum, I should build a MATLAB function that will plot the red function:
In particular, I know the f0 frequency so: - the first period is T0=1/f0, and I want that from 0 to T0 the frequency is fixed at level f0; - than the frequency passes to f1=f0+k*T0 (k is a known constant) and the period is T1=1/f1 and so on.
Do you have any idea on how to build it?

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回答（2 个）

M
M 2017-11-24
basic idea, to adapt to your specific case :
t=20:-1:1;
stairs(1./t)
which gives
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Alessandro Longo
Alessandro Longo 2017-11-24
Unfortunately this is not a good solution because I should implement the code in a Matlab-fcn block for a Simulink model (so I need something like a for/while cycle that will generate this function with time increasing)

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Andrei Bobrov
Andrei Bobrov 2017-11-24
Let T - your T0,T2 and etc. (T = [T0,T1,...,TN]);
f - your f0,f1 and etc. (f = [f0,f1,...fN]).
function F = yourfreq(t,T,f)
ii = discretize(t,[0, T]);
F = f(ii);
end
  1 个评论
Alessandro Longo
Alessandro Longo 2017-11-24
This function requires as input three parameters, while I have only the frequency f0

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