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Formal power series: Difference between revisions
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=={{header|zkl}}==
zkl iterators (aka Walkers) are more versatile than the run-of-the-mill iterator and can be used to represent infinite sequences (eg a finite set can be padded forever or cycled over), which works well here. The Walker tweak method is used to modify iterator behavior (ie how to filter the sequence, what to do if the sequence ends, etc). The Haskell like zipWith Walker method knows how to deal with infinite sequences.
<lang zkl>class IPS{
var [protected] w; // the coefficients of the infinite series
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self
}
fcn __opSub(ipf){ w=w.zipWith('-,ipf.w); self } // IPS -
fcn __opMul(ipf){ } // stub
fcn __opDiv(x){ w.next().toFloat()/x } // *IPS/x, for integtate()
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