docs:Better examples.

Author: antononcube

README-work.md

@@ -122,24 +122,45 @@ flowchart TD
 
 ## Basic usage
 
+Make a new computation engine object and evaluate a LaTeX expression:
+
 ```raku
 use CortexJS;
 my $ce = ComputeEngine.new;
 
 $ce.evaluate($ce.parse-latex('e^{i\\pi}'))
 ```
 
+Expand expression:
+
 ```raku
 $ce.to-latex($ce.expand($ce.parse-latex('(a + b)^2')));
 ```
 
-```raku
-LEAVE $ce.close;
+Simplify expression:
 
+```raku
 my $expr = $ce.parse-latex('3x^2 + 2x^2 + x + 5');
 say "{$ce.to-latex($expr)} = {$ce.to-latex($ce.simplify($expr))}";
 ```
 
+Using assignment for repeated expression evaluation:
+
+```raku
+my $expr = $ce.parse-latex("3x^2+4x+2");
+
+for (0, 0.1 ... 1) -> $x {
+  $ce.assign('x', $x);
+  say "f($x) = {$ce.evaluate($expr)}";
+}
+```
+
+Can be put in the last code block:
+
+```raku
+LEAVE $ce.close;
+```
+
 ----
 
 ## References

README.md

@@ -122,6 +122,8 @@ flowchart TD
 
 ## Basic usage
 
+Make a new computation engine object and evaluate a LaTeX expression:
+
 ```raku
 use CortexJS;
 my $ce = ComputeEngine.new;
@@ -132,23 +134,58 @@ $ce.evaluate($ce.parse-latex('e^{i\\pi}'))
 # -1
 ```
 
+Expand expression:
+
 ```raku
 $ce.to-latex($ce.expand($ce.parse-latex('(a + b)^2')));
 ```
 ```
 # a^2+b^2+2ab
 ```
 
-```raku
-LEAVE $ce.close;
+Simplify expression:
 
+```raku
 my $expr = $ce.parse-latex('3x^2 + 2x^2 + x + 5');
 say "{$ce.to-latex($expr)} = {$ce.to-latex($ce.simplify($expr))}";
 ```
 ```
 # 2x^2+3x^2+x+5 = 5x^2+x+5
 ```
 
+Using assignment for repeated expression evaluation:
+
+```raku
+my $expr = $ce.parse-latex("3x^2+4x+2");
+
+for (0, 0.1 ... 1) -> $x {
+  $ce.assign('x', $x);
+  say "f($x) = {$ce.evaluate($expr)}";
+}
+```
+```
+# f(0) = 2
+# f(0.1) = 2.43
+# f(0.2) = 2.92
+# f(0.3) = 3.47
+# f(0.4) = 4.08
+# f(0.5) = 4.75
+# f(0.6) = 5.48
+# f(0.7) = 6.27
+# f(0.8) = 7.12
+# f(0.9) = 8.03
+# f(1) = 9
+```
+
+Can be put in the last code block:
+
+```raku
+LEAVE $ce.close;
+```
+```
+# (Any)
+```
+
 ----
 
 ## References