matlab error during signal analysis -

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i have set of data. amplitude vs time in seconds. need t6o find out frequency components in signal. time period = 1 second , sampling rate 5000 samples per second when perform fft of signal "undefined function 'fft' input arguments of type 'timeseries' " why ? please

timeseries must vector complex(real) coefficients. there error related type of timeseries, make sure it's vector (that is, has 1 row (or 1 column)).


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