# How can i write the frequency vector for frequency range 5-400 hz using 50 frequncy points

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Lisa Justin on 13 Jul 2012
How can i write the frequency vector for frequency range 5-400 hz using 50 frequncy points

Wayne King on 13 Jul 2012
Hi Lisa, you cannot have 50 frequencies in 30 elements. Obviously whatever Q is here (is it a power spectral density estimate?) is an estimate at only 30 frequency points.
You can space your frequency vector to cover 5 to 400 Hz with fifty points and then select a subset of those 50 so that you can plot(f,Q)
freq = linspace(5,400,50);
% just making up some junk data to plot
Q = abs(randn(30,1));
plot(freq(1:30),Q)

Ryan on 13 Jul 2012
Edited: Ryan on 13 Jul 2012
FrequencyVector = linspace(5,400,50); %linspace(min,max,# of points)
##### 2 CommentsShowHide 1 older comment
Ryan on 13 Jul 2012
See Wayne King's answer. These type of details should be included in the original question to provide the best answer possible.

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