README.md for B1

Author: pspanoudakis

ImageDecode/README.md

@@ -0,0 +1,38 @@
+## Group B - Exercise 1
+
+### Task
+A **2-dimensional, black and white image**,  has been scanned horizontally, vertically and diagonally (both ascending & descending).\
+It has been **encoded** based on the **number of black pixels** in **each row**, **each column** and **each ascending & desceding diagonal**.
+
+Implement a `decode/4` predicate:
+- The first argument is a list with the number of black pixels in each row.
+- The second argument is a list with the number of black pixels in each column.
+- The third argument is a list with the number of black pixels in each ascending diagonal.
+- The fourth argument is a list with the number of black pixels in each desceding diagonal.
+
+The predicate should decode the image and print it.\
+You may use the `diags/3` predicate implemented in [Exercise 1 of Group A](../MatrixDiagonals).
+
+
+### Execution Example
+Input:
+
+    ?- decode(
+            [4,4,3,3,4,4],
+            [2,2,2,4,2,4,2,2,2],
+            [0,2,1,0,2,1,5,5,1,2,0,1,2,0],
+            [0,2,1,0,2,1,5,5,1,2,0,1,2,0]
+        ).
+
+Output:
+
+    . * * . . . * * .
+    * . . * . * . . *
+    . . . * * * . . .
+    . . . * * * . . .
+    * . . * . * . . *
+    . * * . . . * * .
+
+### Implementation
+The `decode` predicate is implemented in `decode.pl`, along with several helper predicates.\
+The `diags\3` predicate, implemented [here](../MatrixDiagonals/diags.pl) is also used.

ImageDecode/decode.pl

@@ -4,7 +4,7 @@
 :- lib(ic).
 
 % diags.pl file (ex1) is required
-:- [diags].
+:- ['../MatrixDiagonals/diags.pl'].
 
 % Lecture code --------------------------
 make_matrix(M, N, Matrix) :-