Make examples self-contained

Planeshifter · Planeshifter · commit e9d7f4e6f9eb · 2018-07-09T11:31:41.000+09:00
diff --git a/lib/node_modules/@stdlib/math/base/tools/sum-series/README.md b/lib/node_modules/@stdlib/math/base/tools/sum-series/README.md
@@ -81,28 +81,64 @@ The `function` accepts the following `options`:
 By default, the initial value of the sum is `0`. To choose a different one, use the `initialValue` option.
 
 ```javascript
-var out = sumSeries( geometricSeriesGenerator( 0.5 ), {
+var pow = require( '@stdlib/math/base/special/pow' );
+
+var out = sumSeries( geometricSeriesClosure( 0.5 ), {
     'initialValue': 1
 });
 // returns 3
+
+function geometricSeriesClosure( x ) {
+    var exponent = -1;
+    return gen;
+
+    function gen() {
+        exponent += 1;
+        return pow( x, exponent );
+    }
+}
 ```
 
 To change the maximum number of terms to be summed, set the `maxTerms` option.
 
 ```javascript
-var out = sumSeries( geometricSeriesGenerator( 0.5 ), {
+var pow = require( '@stdlib/math/base/special/pow' );
+
+var out = sumSeries( geometricSeriesClosure( 0.5 ), {
     'maxTerms': 10
 });
 // returns ~1.998 (infinite sum is 2)
+
+function geometricSeriesClosure( x ) {
+    var exponent = -1;
+    return gen;
+
+    function gen() {
+        exponent += 1;
+        return pow( x, exponent );
+    }
+}
 ```
 
 The default tolerance of `2.22e-16` used to assess convergence can be changed via the `tolerance` option.
 
 ```javascript
-var out = sumSeries( geometricSeriesGenerator( 0.5 ), {
+var pow = require( '@stdlib/math/base/special/pow' );
+
+var out = sumSeries( geometricSeriesClosure( 0.5 ), {
     'tolerance': 1e-3
 });
 // returns ~1.998
+
+function geometricSeriesClosure( x ) {
+    var exponent = -1;
+    return gen;
+
+    function gen() {
+        exponent += 1;
+        return pow( x, exponent );
+    }
+}
 ```
 
 </section>
