1 files changed, 24 insertions, 0 deletions

diff --git a/examples/devel/ej2/functions.c b/examples/devel/ej2/functions.c
new file mode 100644
index 0000000..4dcd377
--- /dev/null
+++ b/examples/devel/ej2/functions.c
@@ -0,0 +1,24 @@
+/*  general element order   */
+
+typedef struct { double r, i; } doublecomplex;
+
+#define DVEC(A) int A##n, double*A##p
+#define CVEC(A) int A##n, doublecomplex*A##p
+#define DMAT(A) int A##r, int A##c, double*A##p
+#define CMAT(A) int A##r, int A##c, doublecomplex*A##p
+
+#define AT(M,r,c) (M##p[(r)*sr+(c)*sc])
+
+int c_diag(int ro, DMAT(m),DVEC(y),DMAT(z)) {
+    int i,j,sr,sc;
+    if (ro==1) { sr = mc; sc = 1;} else { sr = 1; sc = mr;}
+    for (j=0; j<yn; j++) {
+        yp[j] = AT(m,j,j);
+    }
+    for (i=0; i<mr; i++) {
+        for (j=0; j<mc; j++) {
+            AT(z,i,j) = i==j?yp[i]:0;
+        }
+    }
+    return 0;
+}