fix: fixed undefined eigenvectors

Author: yawetse

.dccache

@@ -1 +1 @@
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src/Matrix.test.ts

@@ -335,8 +335,12 @@ describe('Matrix',()=>{
         [5,2]
       ]);
       const e = await m.eigenvectors();
+      const e_rounded = await m.eigenvectors({rounded:true});
       expect(e[0].eigenvalue).toBeCloseTo(7);
-      expect(e[0].multiplicity).toBe(2);
+      expect(e[0].multiplicity).toBe(0);
+      expect(e_rounded[0].eigenvalue).toBe(7);
+      expect(e_rounded[1].eigenvalue).toBe(-4);
+      expect(e_rounded[0].multiplicity).toBe(1);
     });
     it('should round the eigenvectors of the matrix',async()=>{
       const C = new Matrix(c);

src/Matrix.ts

@@ -285,10 +285,16 @@ export class Matrix{
     return eigenvectors.map(({eigenvalue,eigenvectors}) => {
       const {vector,...vectors} = eigenvectors;
       const evs:number[][] = Object.values(vectors) as number[][];
+      const evectors = evs
+        .map((ev:number[])=>ev.length
+          ?new Vector(ev)
+          :undefined
+        )
+        .filter((ev:Vector|undefined)=>ev);
       return {
         eigenvalue,
-        eigenvectors:evs.map((ev:number[])=>new Vector(ev)),
-        multiplicity:evs.length
+        eigenvectors:evectors,
+        multiplicity:evectors.length
       }
     });
   }