June 2018 Update

Task/Zig-zag-matrix/Scilab/zig-zag-matrix.scilab

@@ -0,0 +1,19 @@
+function a = zigzag3(n)
+  a = zeros(n, n)
+  for k=1:n
+    j = modulo(k, 2)
+    d = (2*j-1)*(n-1)
+    m = (n-1)*(k-1)
+    a(k+(1-j)*m:d:k+j*m) = k*(k-1)/2:k*(k+1)/2-1
+    a(n*(n+1-k)+(1-j)*m:d:n*(n+1-k)+j*m) = n*n-k*(k+1)/2:n*n-k*(k-1)/2-1
+  end
+endfunction
+
+-->zigzag3(5)
+ ans  =
+
+    0.     1.     5.     6.     14.
+    2.     4.     7.     13.    15.
+    3.     8.     12.    16.    21.
+    9.     11.    17.    20.    22.
+    10.    18.    19.    23.    24.