How can I make this work? Invalid data type. First argument must be double, single, int8, uint8, int16, uint16, int32, uint32, or logical. Error in AccelerationWeek10 (line 15)16. s = fft(Accel);%3

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Stephen Bell 2018-5-12

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回答： Stephen Bell 2018-5-13

1.close all 2.npts = 2^15; 3.sfreq = 22150; 4. dt = 1/sfreq; 5. t = (0:npts-1)'*dt; 6. m = 500 % mass 7. k = 1000000; 8. c= 1000; 9. naturalFr = sqrt(k/m) 10. sim('week7')% Simulink 11. figure(1) 13.plot(Accel) 14. xlabel('Time [s]') 15. ylabel('Signal [units]') 16. s = fft(Accel);%3

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Jan 2018-5-12

编辑：Jan 2018-5-12

Remove the numeration of the lines, but select the code with the mouse and press the "{} Code" button. Afterwards your code is readable.

What is Accel? According to the error message it does not contain numerical data. But it should.

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Answer 1

Ameer Hamza 2018-5-12

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It seems that Accel is produced by To Workspace block in your Simulink model 'week7'. In this case Accel will have the class timeseries, and therefore you are getting the error. You need to use Data property of Accel for fft(). So try

s = fft(Accel.Data);