Data commit

Task/Spiral-matrix/Python/spiral-matrix-1.py

@@ -0,0 +1,22 @@
+def spiral(n):
+    dx,dy = 1,0            # Starting increments
+    x,y = 0,0              # Starting location
+    myarray = [[None]* n for j in range(n)]
+    for i in xrange(n**2):
+        myarray[x][y] = i
+        nx,ny = x+dx, y+dy
+        if 0<=nx<n and 0<=ny<n and myarray[nx][ny] == None:
+            x,y = nx,ny
+        else:
+            dx,dy = -dy,dx
+            x,y = x+dx, y+dy
+    return myarray
+
+def printspiral(myarray):
+    n = range(len(myarray))
+    for y in n:
+        for x in n:
+            print "%2i" % myarray[x][y],
+        print
+
+printspiral(spiral(5))

Task/Spiral-matrix/Python/spiral-matrix-2.py

@@ -0,0 +1,23 @@
+def spiral(n):
+    def spiral_part(x, y, n):
+        if x == -1 and y == 0:
+            return -1
+        if y == (x+1) and x < (n // 2):
+            return spiral_part(x-1, y-1, n-1) + 4*(n-y)
+        if x < (n-y) and y <= x:
+            return spiral_part(y-1, y, n) + (x-y) + 1
+        if x >= (n-y) and y <= x:
+            return spiral_part(x, y-1, n) + 1
+        if x >= (n-y) and y > x:
+            return spiral_part(x+1, y, n) + 1
+        if x < (n-y) and y > x:
+            return spiral_part(x, y-1, n) - 1
+
+    array = [[0] * n for j in xrange(n)]
+    for x in xrange(n):
+        for y in xrange(n):
+            array[x][y] = spiral_part(y, x, n)
+    return array
+
+for row in spiral(5):
+    print " ".join("%2s" % x for x in row)

Task/Spiral-matrix/Python/spiral-matrix-3.py

@@ -0,0 +1,18 @@
+def rot_right(a):
+    return zip(*a[::-1])
+
+def sp(m, n, start = 0):
+    """ Generate number range spiral of dimensions m x n
+    """
+    if n == 0:
+        yield ()
+    else:
+        yield tuple(range(start, m + start))
+        for row in rot_right(list(sp(n - 1, m, m + start))):
+            yield row
+
+def spiral(m):
+    return sp(m, m)
+
+for row in spiral(5):
+    print(''.join('%3i' % i for i in row))

Task/Spiral-matrix/Python/spiral-matrix-4.py

@@ -0,0 +1,16 @@
+def spiral(n):
+    dat = [[None] * n for i in range(n)]
+    le = [[i + 1, i + 1] for i in reversed(range(n))]
+    le = sum(le, [])[1:]  # for n = 5 le will be [5, 4, 4, 3, 3, 2, 2, 1, 1]
+    dxdy = [[1, 0], [0, 1], [-1, 0], [0, -1]] * ((len(le) + 4) / 4)  # long enough
+    x, y, val = -1, 0, -1
+    for steps, (dx, dy) in zip(le, dxdy):
+        x, y, val = x + dx, y + dy, val + 1
+        for j in range(steps):
+            dat[y][x] = val
+            if j != steps-1:
+                x, y, val = x + dx, y + dy, val + 1
+    return dat
+
+for row in spiral(5): # calc spiral and print it
+    print ' '.join('%3s' % x for x in row)

Task/Spiral-matrix/Python/spiral-matrix-5.py

@@ -0,0 +1,19 @@
+import itertools
+
+concat = itertools.chain.from_iterable
+def partial_sums(items):
+    s = 0
+    for x in items:
+        s += x
+        yield s
+
+grade = lambda xs: sorted(range(len(xs)), key=xs.__getitem__)
+values = lambda n: itertools.cycle([1,n,-1,-n])
+counts = lambda n: concat([i,i-1] for i in range(n,0,-1))
+reshape = lambda n, xs: zip(*([iter(xs)] * n))
+
+spiral = lambda n: reshape(n, grade(list(partial_sums(concat(
+                       [v]*c for c,v in zip(counts(n), values(n)))))))
+
+for row in spiral(5):
+    print(' '.join('%3s' % x for x in row))

Task/Spiral-matrix/Python/spiral-matrix-6.py

@@ -0,0 +1,43 @@
+'''Spiral Matrix'''
+
+
+# spiral :: Int -> [[Int]]
+def spiral(n):
+    '''The rows of a spiral matrix of order N.
+    '''
+    def go(rows, cols, x):
+        return [range(x, x + cols)] + [
+            reversed(x) for x
+            in zip(*go(cols, rows - 1, x + cols))
+        ] if 0 < rows else [[]]
+    return go(n, n, 0)
+
+
+# ------------------------- TEST -------------------------
+# main :: IO ()
+def main():
+    '''Spiral matrix of order 5, in wiki table markup.
+    '''
+    print(
+        wikiTable(spiral(5))
+    )
+
+
+# ---------------------- FORMATTING ----------------------
+
+# wikiTable :: [[a]] -> String
+def wikiTable(rows):
+    '''Wiki markup for a no-frills tabulation of rows.'''
+    return '{| class="wikitable" style="' + (
+        'width:12em;height:12em;table-layout:fixed;"|-\n'
+    ) + '\n|-\n'.join(
+        '| ' + ' || '.join(
+            str(cell) for cell in row
+        )
+        for row in rows
+    ) + '\n|}'
+
+
+# MAIN ---
+if __name__ == '__main__':
+    main()

Task/Spiral-matrix/Python/spiral-matrix-7.py

@@ -0,0 +1,12 @@
+def spiral_matrix(n):
+    m = [[0] * n for i in range(n)]
+    dx, dy = [0, 1, 0, -1], [1, 0, -1, 0]
+    x, y, c = 0, -1, 1
+    for i in range(n + n - 1):
+        for j in range((n + n - i) // 2):
+            x += dx[i % 4]
+            y += dy[i % 4]
+            m[x][y] = c
+            c += 1
+    return m
+for i in spiral_matrix(5): print(*i)

Task/Spiral-matrix/Python/spiral-matrix-8.py

@@ -0,0 +1,5 @@
+1 2 3 4 5
+16 17 18 19 6
+15 24 25 20 7
+14 23 22 21 8
+13 12 11 10 9