Intial Commit

nodered/rootfs/data/node_modules/mathjs/examples/chaining.js

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+// chaining
+
+// load math.js (using node.js)
+var math = require('../index');
+
+// create a chained operation using the function `chain(value)`
+// end a chain using done(). Let's calculate (3 + 4) * 2
+var a = math.chain(3)
+    .add(4)
+    .multiply(2)
+    .done();
+print(a);  // 14
+
+// Another example, calculate square(sin(pi / 4))
+var b = math.chain(math.pi)
+    .divide(4)
+    .sin()
+    .square()
+    .done();
+print(b);  // 0.5
+
+// A chain has a few special methods: done, toString, valueOf, get, and set.
+// these are demonstrated in the following examples
+
+// toString will return a string representation of the chain's value
+var chain = math.chain(2).divide(3);
+var str = chain.toString();
+print(str);  // "0.6666666666666666"
+
+// a chain has a function .valueOf(), which returns the value hold by the chain.
+// This allows using it in regular operations. The function valueOf() acts the
+// same as function done().
+print(chain.valueOf()); // 0.66666666666667
+print(chain + 2);       // 2.6666666666667
+
+
+// the function subset can be used to get or replace sub matrices
+var array = [[1, 2], [3, 4]];
+var v = math.chain(array)
+    .subset(math.index(1, 0))
+    .done();
+print(v);  // 3
+
+var m = math.chain(array)
+    .subset(math.index(0, 0), 8)
+    .multiply(3)
+    .done();
+print(m);  // [[24, 6], [9, 12]]
+
+
+/**
+ * Helper function to output a value in the console. Value will be formatted.
+ * @param {*} value
+ */
+function print (value) {
+  var precision = 14;
+  console.log(math.format(value, precision));
+}