I tried to obtain properties from scipy.signal.find_peaks, but it returns an empty dictionary {}. Can anyone help to fix it?
line={'x':[3405.024, 3405.312, 3406.176, 3406.464, 3406.752, 3407.04, 3407.328, 3408.192, 3408.48, 3408.768, 3409.056, 3409.344, 3410.208, 3410.496, 3410.784, 3411.072, 3411.36, 3412.224, 3412.512, 3412.8, 3413.088, 3413.376, 3414.24, 3414.528, 3414.816, 3415.104, 3415.392, 3416.256, 3416.544, 3416.832, 3417.12, 3417.408, 3418.272, 3418.56, 3418.848, 3419.136, 3419.424, 3420.288, 3420.576, 3420.864, 3421.152, 3421.44, 3422.304, 3422.592, 3422.88, 3423.168, 3423.456, 3424.32, 3424.608, 3424.896, 3425.184, 3425.472, 3426.336, 3426.624, 3426.912, 3427.2, 3427.488, 3428.352, 3428.64, 3428.928, 3429.216, 3429.504, 3430.368, 3430.656, 3430.944, 3431.232, 3431.52, 3432.384, 3432.672, 3432.96, 3433.248, 3433.536, 3434.4, 3434.688, 3434.976, 3435.264, 3435.552, 3436.416, 3436.704, 3436.992, 3437.28, 3437.568, 3438.432, 3438.72, 3439.008, 3439.296, 3439.584, 3440.448, 3440.736, 3441.024, 3441.312, 3441.6, 3442.464, 3442.752, 3443.04, 3443.328, 3443.616, 3446.784, 3447.072, 3447.36, 3447.648, 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2.9161729891245227, 2.911935999891451, 2.896417726428179, 2.898940273843373, 2.8951579879203897, 2.886189355260204, 2.9091151063692093, 2.8992706703011177, 2.895453863515079, 2.8788995783497784, 2.8789845854022316, 2.89047933320601, 2.8979224192980593, 2.8881360937889298, 2.896751710195652, 2.8790824784924367, 2.8969734235605875, 2.898082683905878, 2.909342251831121, 2.9070673254146855, 2.8872077101208267, 2.891123474503871, 2.888572314334519, 2.8817986291265023, 2.8753337226251725, 2.8737598581078565, 2.8783575789921154, 2.867808253209416, 2.8497945212357005, 2.8392950365274237, 2.8153576260700426, 2.8185456929134998, 2.8253019924080207, 2.8288712405608827, 2.8221710322062323, 2.8100183794152946, 2.7681498575125953, 2.742390211943808, 2.792849100488907, 2.790026871755891, 2.792735260255324, 2.7746751189360492, 2.7928607427598386, 2.778956818305892, 2.774587510597919, 2.7629222212014386, 2.7385934473474234, 2.745969768703785, 2.7503317074577964, 2.7649130418783114, 2.767732897488769, 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from scipy.signal import find_peaks
max_index, properties = find_peaks(line['y'],prominence=None)
max_x = [line['x'][i] for i in max_index]
max_y = [line['y'][i] for i in max_index]
peak = {'x':max_x,'y':max_y}
print(properties)
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Answer
The problem is that you are passing None to prominence. None is already the default value, and is used to signal that no value for the argument was given.
Pass a numeric value as below:
max_index, properties = find_peaks(line['y'], prominence=0.1)
max_x = [line['x'][i] for i in max_index]
max_y = [line['y'][i] for i in max_index]
peak = {'x': max_x, 'y': max_y}
print(properties)
Output
{'prominences': array([0.27416504, 0.10761815]), 'left_bases': array([ 14, 132]), 'right_bases': array([158, 158])}