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what is function of [ ] in this code

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moonman
moonman 2011-10-21
Here is the code
h1336=[];
L=50;
fs=8000;
fb=1336;
h1336 = (2/L)*cos(2*pi*fb*(0:L-1)/fs);
[H,F] = freqz(h1336,1,[],fs);
What does this bracket [ ] do in freqz command

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采纳的回答

Wayne King
Wayne King 2011-10-21
It says "use the default value for the input N, the number of frequency points".
in freqz() that is 512.
So
[H,F] = freqz(h1336,1,[],fs);
is the same as:
[H,F] = freqz(h1336,1,512,fs);

更多回答（1 个）

Walter Roberson
Walter Roberson 2011-10-21
http://www.mathworks.com/help/toolbox/signal/ref/freqz.html
If you do not specify the integer n, or you specify it as the empty vector [], the frequency response is calculated using the default value of 512 samples.

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