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41 changes: 41 additions & 0 deletions
41
src/main/java/palaiologos/kamilalisp/runtime/flt64/Flt64Inv.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| package palaiologos.kamilalisp.runtime.flt64; | ||
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| import palaiologos.kamilalisp.atom.Atom; | ||
| import palaiologos.kamilalisp.atom.Environment; | ||
| import palaiologos.kamilalisp.atom.Lambda; | ||
| import palaiologos.kamilalisp.atom.PrimitiveFunction; | ||
| import palaiologos.kamilalisp.runtime.array.Rank; | ||
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| import java.util.Arrays; | ||
| import java.util.List; | ||
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| public class Flt64Inv extends PrimitiveFunction implements Lambda { | ||
| @Override | ||
| public Atom apply(Environment env, List<Atom> args) { | ||
| Atom a1 = args.get(0); | ||
| if (Rank.computeRank(a1) != 2) { | ||
| throw new RuntimeException("Expected a matrix of rank 2."); | ||
| } | ||
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| List<List<Atom>> l1 = a1.getList().stream().map(Atom::getList).toList(); | ||
| if (l1.stream().anyMatch(x -> x.size() != l1.get(0).size())) { | ||
| throw new RuntimeException("Expected a square matrix."); | ||
| } | ||
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| double[][] A = l1.stream().map(x -> x.stream().mapToDouble(Flt64Base::toFlt64).toArray()).toArray(double[][]::new); | ||
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| double invdet = 1 / Flt64Det.det(A); | ||
| for(int i = 0; i < A.length; i++) { | ||
| for(int j = 0; j < A.length; j++) { | ||
| A[i][j] *= invdet; | ||
| } | ||
| } | ||
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| return new Atom(Arrays.stream(A).map(x -> new Atom(Arrays.stream(x).mapToObj(Flt64Base::toAtom).toList())).toList()); | ||
| } | ||
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| @Override | ||
| protected String name() { | ||
| return "flt64:invert"; | ||
| } | ||
| } |
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31 changes: 31 additions & 0 deletions
31
src/main/java/palaiologos/kamilalisp/runtime/math/num/I.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| package palaiologos.kamilalisp.runtime.math.num; | ||
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| import palaiologos.kamilalisp.atom.Atom; | ||
| import palaiologos.kamilalisp.atom.Environment; | ||
| import palaiologos.kamilalisp.atom.Lambda; | ||
| import palaiologos.kamilalisp.atom.PrimitiveFunction; | ||
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| import java.math.BigInteger; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
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| public class I extends PrimitiveFunction implements Lambda { | ||
| @Override | ||
| public Atom apply(Environment env, List<Atom> args) { | ||
| assertArity(args, 1); | ||
| int size = args.get(0).getInteger().intValueExact(); | ||
| List<Atom> result = new ArrayList<>(); | ||
| for(int i = 0; i < size; i++) { | ||
| List<Atom> row = new ArrayList<>(); | ||
| for(int j = 0; j < size; j++) | ||
| row.add(new Atom(BigInteger.valueOf(i == j ? 1 : 0))); | ||
| result.add(new Atom(row)); | ||
| } | ||
| return new Atom(result); | ||
| } | ||
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| @Override | ||
| protected String name() { | ||
| return "num:I"; | ||
| } | ||
| } |
27 changes: 27 additions & 0 deletions
27
src/main/java/palaiologos/kamilalisp/runtime/math/num/Inv.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| package palaiologos.kamilalisp.runtime.math.num; | ||
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| import palaiologos.kamilalisp.atom.*; | ||
| import palaiologos.kamilalisp.runtime.array.Rank; | ||
| import palaiologos.kamilalisp.runtime.math.Slash; | ||
| import palaiologos.kamilalisp.runtime.math.Star; | ||
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| import java.util.List; | ||
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| public class Inv extends PrimitiveFunction implements Lambda { | ||
| @Override | ||
| public Atom apply(Environment env, List<Atom> args) { | ||
| Atom a1 = args.get(0); | ||
| if (Rank.computeRank(a1) != 2) { | ||
| throw new RuntimeException("Expected a matrix of rank 2."); | ||
| } | ||
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| List<List<Atom>> l1 = a1.getList().stream().map(Atom::getList).toList(); | ||
| Atom result = Det.det(env.getMathContext(), l1); | ||
| return Star.multiply2(Slash.quot1(env, result), a1); | ||
| } | ||
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| @Override | ||
| protected String name() { | ||
| return "num:invert"; | ||
| } | ||
| } |