version 20200730

example added

packages/README.md

@@ -4,11 +4,43 @@ Currently the following packages are available:
 - **SQLinDS**\[2.1\], based on Mike Rhoads' article *Use the Full Power of SAS in Your Function-Style Macros*. The package allows to write SQL queries in the data step, e.g.
 ```
 data class;
-  set %SQL(select * from sashelp.class order by age);
+  set %SQL(
+    select age, name, weight, height 
+    from sashelp.class 
+    order by age
+    );
+    
+    WH = weight + height;
 run;
 ```
 
 - **DFA** (Dynamic Function Arrays)\[0.2\], contains set of macros and FCMP functions which implement: a dynamically allocated array, a stack, a fifo queue, an ordered stack, and a priority queue, run `%helpPackage(DFA,createDFArray)` to find examples.
+```
+%createDFArray(ArrDynamic, resizefactor=17);
+
+data _null_;
+  call ArrDynamic("Allocate", -2, 2);
+
+  do i = -2 to 2;
+    call ArrDynamic("Input", i, 2**i);
+  end;
+
+  L = .; H = .;
+  call ArrDynamic("Dim", L, H);
+  put L= H=;
+
+  call ArrDynamic("+", 3, 8);
+  call ArrDynamic("+",-3, 0.125);
+  call ArrDynamic("Dim", L, H);
+  put L= H=;
+
+  Value = .;
+  do i = L to H;
+    call ArrDynamic("O", i, Value);
+    put i= Value=;
+  end;
+run;
+```
 
 - **macroArray**\[0.3\], implementation of an array concept in a macrolanguage, e.g. 
 ```
@@ -42,4 +74,3 @@ format x bool.;
 
 - **dynMacroArray**\[0.2\], set of macros (wrappers for a hash table) emulating dynamic array in the data step (macro predecessor of DFA)
 
-### ======