Averages/Simple moving average: Difference between revisions

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@@ Line 4,212: / Line 4,212: @@
 =={{header|zkl}}==
-<lang zkl>class [static] SMA{var P=3,ns=L();  // only one instance of this class
-   fcn init(n){
-      if(P<ns.append(n.toFloat()).len()) ns.del(0);
-      returnClass(ns.sum(0.0)/ns.len()); // return average, not Class
-   }
-   fcn reset(p){P=p;ns=L();}  // to make examples easier
-}</lang>
-<lang zkl>zkl: T(1,2,3,4,5,5,4,3,2,1).apply(SMA)
-L(1,1.5,2,3,4,4.66667,4.66667,4,3,2)
-zkl: SMA.reset(5)
-zkl: T(1,2,3,4,5,5,4,3,2,1).apply(SMA)
-L(1,1.5,2,2.5,3,3.8,4.2,4.2,3.8,3)</lang>
-Using a closure and creating a function
 <lang zkl>fcn SMA(P){
-   fcn(n,ns,P){ if(P<ns.append(n.toFloat()).len()) ns.del(0);
+   fcn(n,ns,P){
-      ns.sum(0.0)/ns.len()
+      sz:=ns.append(n.toFloat()).len();
-   }.fp1(L(),P)
+      if(P>sz) return(0);
+      if(P<sz) ns.del(0);
+      ns.sum(0.0)/P;
+   }.fp1(List.createLong(P+1),P)  // pre-allocate a list of length P+1
 }</lang>
+fp1 creates a partial application fixing the (in this case) the second and third
-<lang zkl>zkl: T(1,2,3,4,5,5,4,3,2,1).apply(SMA(3))
+parameters
-L(1,1.5,2,3,4,4.66667,4.66667,4,3,2)
+<lang zkl>T(1,2,3,4,5,5,4,3,2,1).apply(SMA(3)).println();
-zkl: T(1,2,3,4,5,5,4,3,2,1).apply(SMA(5))
+T(1,2,3,4,5,5,4,3,2,1).apply(SMA(5)).println();</lang>
+{{out}}
-L(1,1.5,2,2.5,3,3.8,4.2,4.2,3.8,3)</lang>
+<pre>
+L(0,0,2,3,4,4.66667,4.66667,4,3,2)
+L(0,0,0,0,3,3.8,4.2,4.2,3.8,3)
+</pre>