``` use tsfrs::TSF; use tacommon::traits::Indicator; let mut tsf = TSF::new(5); asserteq!(tsf.next(81.59), None); asserteq!(tsf.next(81.06), None); asserteq!(tsf.next(82.87), None); asserteq!(tsf.next(83.00), None); asserteq!(tsf.next(83.61), Some(84.22)); asserteq!(tsf.next(83.15), Some(84.21399999999998)); asserteq!(tsf.next(82.84), Some(83.12099999999998)); asserteq!(tsf.next(83.99), Some(83.68099999999998)); asserteq!(tsf.next(84.55), Some(84.44399999999997)); asserteq!(tsf.next(84.36), Some(85.017)); asserteq!(tsf.next(85.53), Some(85.97899999999998)); asserteq!(tsf.next(86.54), Some(86.81799999999997)); asserteq!(tsf.next(86.89), Some(87.63199999999998)); asserteq!(tsf.next(87.77), Some(88.67199999999997)); assert_eq!(tsf.next(87.29), Some(88.22899999999996));
```