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Task/Matrix-exponentiation-operator/ERRE/matrix-exponentiation-operator.erre

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+PROGRAM MAT_PROD
+
+!$MATRIX
+
+!-----------------
+! calculate A[]^N
+!-----------------
+
+CONST ORDER=1
+
+DIM A[1,1],B[1,1],ANS[1,1]
+
+BEGIN
+
+DATA(3,2,2,1)
+DATA(10)  ! integer power only
+
+FOR I=0 TO ORDER DO
+   FOR J=0 TO ORDER DO
+      READ(A[I,J])
+   END FOR
+END FOR
+
+READ(M)  N=M-1
+
+IF N=0 THEN   ! A[]^0=matrice identit…
+   for I=0 TO ORDER DO
+      B[I,I]=1
+   END FOR
+ ELSE
+   B[]=A[]
+   FOR Z=1 TO N DO
+      ANS[]=0
+      FOR I=0 TO ORDER DO
+         FOR J=0 TO ORDER DO
+            FOR K=0 TO ORDER DO
+               ANS[I,J]=ANS[I,J]+(A[I,K]*B[K,J])
+            END FOR
+         END FOR
+      END FOR
+      B[]=ANS[]
+  END FOR
+END IF
+
+! print answer
+  FOR I=0 TO ORDER DO
+     FOR J=0 TO ORDER DO
+        PRINT(B[I,J],)
+     END FOR
+     PRINT
+  END FOR
+
+END PROGRAM