Examples: polished tutorial

examples/indexing.cpp

@@ -0,0 +1,45 @@
+#include "isaac/array.h"
+
+namespace sc = isaac;
+
+int main()
+{
+    static const char * sline = "--------------------";
+    static const char * dline = "====================";
+
+    std::cout << dline << std::endl;
+    std::cout << "Tutorial: Indexing " << std::endl;
+    std::cout << dline << std::endl;
+
+    sc::int_t M = 10, N = 7;
+
+    std::vector<float> data(M*N);
+    for(unsigned int i = 0 ; i < data.size(); ++i)
+      data[i] = i;
+    sc::array A = sc::array(M, N, data);
+
+    std::cout << "A:" << std::endl;
+    std::cout << sline << std::endl;
+    std::cout << A << std::endl;
+    std::cout << std::endl;
+
+    std::cout << "A[3, 2:end]:" << std::endl;
+    std::cout << sline << std::endl;
+    std::cout << A(3, {2,sc::end}) << std::endl;
+    std::cout << std::endl;
+
+    std::cout << "A[2:end, 4]:" << std::endl;
+    std::cout << sline << std::endl;
+    std::cout << A({2,sc::end}, 4) << std::endl;
+    std::cout << std::endl;
+
+    std::cout << "diag(A,  1): " << std::endl;
+    std::cout << sline << std::endl;
+    std::cout << sc::diag(A, 1) << std::endl;
+    std::cout << std::endl;
+
+    std::cout << "diag(A, -7): " << std::endl;
+    std::cout << sline << std::endl;
+    std::cout << sc::diag(A, -7) << std::endl;
+    std::cout << std::endl;
+}