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annotate m-toolbox/classes/+utils/@math/getfftfreq.m @ 24:056f8e1e995e database-connection-manager

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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
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1 %
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2 % GETFFTFREQ: get frequencies for fft
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3 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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4 %
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5 % Luigi Ferraioli 04-02-2011
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6 %
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7 % % $Id: getfftfreq.m,v 1.1 2011/02/04 11:11:29 luigi Exp $
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8 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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9 function f = getfftfreq(nfft,fs,type)
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10 switch lower(type)
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11 case 'plain'
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12 f = (0:nfft-1).*fs./nfft;
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13 case 'one'
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14 f = (0:floor(nfft/2)).*fs./nfft;
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15 case 'two'
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16 if rem(nfft,2) % odd number of data
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17 f = fftshift([0:floor(nfft/2) -(floor(nfft/2)):-1].*fs./nfft);
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18 else % even number of data
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19 f = fftshift([0:floor(nfft/2)-1 -floor(nfft/2):-1].*fs./nfft);
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20 end
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21 end
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22 end