npeaks(18, 6) # 3
npeaks(38, 105) # 38
npeaks(36, 9) # 4
npeaks(12, 9) # 4
npeaks(9, 12) # 3
npeaks(-5, 12) # NA - only integer numbers > 0 allowed
npeaks(3, 0) # NA - only integer numbers > 0 allowed
npeaks(3.2, 12) # NA - only integer numbers > 0 allowed
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