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--- at:tutorial:basic [2020/02/09 21:53]
elisag
+++ at:tutorial:basic [2020/02/09 22:03]
elisag
@@ Line 230: / Line 230: @@
 >> 21
 </code>
@@ Line 246: / Line 249: @@
 As is customary in languages with the above optional arguments, AmbientTalk requires mandatory parameters to be defined //before// optional parameters, which should in turn be defined //before// a variable-argument parameter, if any.
-Let us show how to use optional arguments to define an auxilary function that creates matrices as follows:
+Let us show how to use optional arguments to define an auxilary function that creates matrices:
 <code>
@@ Line 252: / Line 255: @@
   def [i,j] := [0,0];
   def makeCol(i,j) {
-     def col[m] { j := j + 1; init(n,m) }
+     def col[m] { j := j + 1; init(i,j) }
   };
   def matrix[n] { i := i + 1; makeCol(i,j)}
 };
-def b := makeMatrix(2,4, {|i,j| object: { def occupied := false }});
->((b[2])[4]).occupied := true
->>true
->(h[2]).each: {|e| system.print(" " + e.occupied)}
->> false false false true
 >def c := makeMatrix(3);
 >>[[0, 0, 0], [0, 0, 0], [0, 0, 0]]
@@ Line 267: / Line 265: @@
 >c
 >>[[1, 2, 3], [0, 0, 0], [0, 0, 0]]
+>def d := makeMatrix(4,4, { |i,j| if: (i == j) then: {1} else: {0}});
+>> [[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]
 </code>

Ambient-Oriented Programming