fix finding wave frequency from FFT

bareboat-necessities · Apr 22, 2024 · 1277270 · 1277270
1 parent 48fc747
commit 1277270
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/docs/bareboat-math.adoc b/docs/bareboat-math.adoc
@@ -393,7 +393,7 @@ w = fft.rfft(accZ_val)
 freqs = fft.rfftfreq(N_SAMP, 1 / SAMPLE_RATE)
 
 # Find the peak in the coefficients
-idx = np.argmax(np.abs(w))
+idx = np.argmax(np.divide(np.divide(np.abs(w), freqs), freqs))
 freq = freqs[idx]
 freq_in_hertz = abs(freq)
 period = 1 / freq_in_hertz