Merge pull request #73 from danbev/add-pretty-matrix

add prettyMatrix method to Gate class

CHANGELOG.md

@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - `@qiskit/qiskit-qasm`: Use QasmError for jison error handling
 - `@qiskit/qiskit-qasm`: Make parser a member of class Parser
 - `@qiskit/qiskit-qasm`: Use TypeError as error for incorrect type
+- `@qiskit/qiskit-sim`: add prettyMatrix method to Gate class
 
 ## [0.9.0] - 2019-05-13
 

packages/qiskit-sim/lib/gates.js

@@ -47,6 +47,12 @@ class Gate {
     this.name = name;
     this.matrix = matrix;
   }
+
+  prettyMatrix() {
+    let str = '';
+    this.matrix.forEach( (m) => { str += `[${m.join(', ')}]\n`; } );
+    return str;
+  }
 }
 
 Gate.x = new Gate('x', [[0, 1], [1, 0]]);

packages/qiskit-sim/test/functional/gates.js

@@ -42,4 +42,12 @@ describe('sim:gates', () => {
   it('t gate should have the same unitary matrix as the r4 gate', () => {
     assert.deepEqual(Gate.t.matrix, Gate.r4.matrix);
   });
+
+  it('prettyMatrix should return a pretty matrix', () => {
+    const expected = '[1, 0, 0, 0]\n' +
+                     '[0, 1, 0, 0]\n' +
+                     '[0, 0, 0, 1]\n' +
+                     '[0, 0, 1, 0]\n';
+    assert.strictEqual(Gate.cx.prettyMatrix(), expected);
+  });
 });