find values between constants in vector

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Leor Greenberger
Leor Greenberger 2011-9-21
I have a vector freq_n where I want to find the indices corresponding to values between a and b.
freq_in-10*delta_f <= freq_n <= freq_in+10*delta_f
How would I go about doing this? The find() function seems to only allow one relational operator, unless I am doing something wrong? thanks!

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采纳的回答

Sean de Wolski
Sean de Wolski 2011-9-21
idx = X >= a & X <= b;
where X is your vector, a is the lower bound, b is the upper bound. This will be their logical values. If you want numerical indices:
find(idx)

更多回答（2 个）

Wayne King
Wayne King 2011-9-21
freq = 0:1:500;
[~,indices] = find(freq>20 & freq < 250);
freq(indices)
Leor Greenberger
Leor Greenberger 2011-9-21
ah. I think I got it:
find(freq_n <= freq_in+10*delta_f & freq_n >= freq_in-10*delta_f)
I was initially using && and that wasn't working.

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