Extract a range of frequencies from a vector/array

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Hello,
I hope you are in good health.
I am trying to select a range of frequencies from the given data set.
load phaseNoise.mat
plot(fnew,pnew)
new_value_from_fnew = fnew(fnew = 10e+009 | fnew <= 30e+009);
Unable to use a value of type string as an index.
However, I get an error when I try to set the initial and final value saying that 'Unable to use a value of type string as an index.'. I have tried changing the data type as well but didn't work either.
Basically, I want to only select the frequencies from 10GHz to 30GHz and discard the rest of the values so I can display the graph from 10GHz to 30GHz and perform further analysis on the given range only.
Any help will be appreciated.
BR.

Accepted Answer

KSSV
KSSV on 27 Sep 2022
new_value_from_fnew = fnew(fnew == 10e+009 | fnew > 30e+009); % <--- replace = with ==
  1 Comment
khan
khan on 27 Sep 2022
@KSSV wow ...
Thank you.
Can I also ask how to access the Y values for the given range?

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