11 lines
247 B
Text
11 lines
247 B
Text
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fcn forwardDiff(lst){
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if(lst.len()<2)
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return(T);
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return(T(lst[1]-lst[0]).extend(forwardDiff(lst[1,*])))
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}
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fcn nthForwardDiff(n,xs){
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if(n==0)
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return(xs);
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return(nthForwardDiff(n-1,forwardDiff(xs))) // tail recursion
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}
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