Data update

Task/Display-a-linear-combination/JavaScript/display-a-linear-combination.js

@@ -0,0 +1,28 @@
+function basisify(a) {
+  let terms = [];
+  for (let i = 0; i < a.length; i++) {
+    if (a[i] !== 0) {
+      terms.push(`${a[i]}*e(${i+1})`);
+    }
+  }
+  if (terms.length === 0) {
+    return "0";
+  }
+  terms = terms.map(s => s.replace("1*", ""));
+  return terms.join(" + ").replace("+ -", "- ");
+}
+
+const test_vectors = [[1, 2, 3],
+                     [0, 1, 2, 3],
+                     [1, 0, 3, 4],
+                     [1, 2, 0],
+                     [0, 0, 0],
+                     [0],
+                     [1, 1, 1],
+                     [-1, -1, -1],
+                     [-1, -2, 0, -3],
+                     [-1]];
+
+for (const s of test_vectors.map(basisify)){
+  console.log(s);
+}