1 files changed, 46 insertions, 0 deletions
diff --git a/rc_skip_last.py b/rc_skip_last.py
new file mode 100755
index 0000000..6557039
--- /dev/null
+++ b/rc_skip_last.py
@@ -0,0 +1,46 @@
+# rc.py
+
+class RC():
+    def __init__(self,nr,nc):
+        self.nr=nr; self.nc=nc
+
+    def inc_r(self,ind):
+        r,c=self.row_col(ind)
+        r+=1
+        if r==self.nr: r=0
+        if r==(self.nr-1) and c==(self.nc-1): r=0
+        return self.indx(r,c)
+
+    def dec_r(self,ind):
+        r,c=self.row_col(ind)
+        r-=1
+        if r<0: r=self.nr-1
+        if r==(self.nr-1) and c==(self.nc-1): r=self.nr-2
+        return self.indx(r,c)
+
+    def inc_c(self,ind):
+        r,c=self.row_col(ind)
+        c+=1
+        if c==self.nc: c=0
+        if r==(self.nr-1) and c==(self.nc-1): c=0
+        return self.indx(r,c)
+
+    def dec_c(self,ind):
+        r,c=self.row_col(ind)
+        c-=1
+        if c<0: c=self.nc-1
+        if r==(self.nr-1) and c==(self.nc-1): c=self.nc-2
+        return self.indx(r,c)
+
+    def row_col(self,ind):
+        i=0
+        for r in range(self.nr):
+            for c in range(self.nc):
+                if i==ind: return r,c
+                i+=1
+
+    def indx(self,r,c):
+        return r*self.nc+c
+
+
+