Moved weave

1 files changed, 105 insertions, 0 deletions

diff --git a/scipy/weave/examples/array3d.py b/scipy/weave/examples/array3d.py
new file mode 100644
index 000000000..05c7da179
--- /dev/null
+++ b/scipy/weave/examples/array3d.py
@@ -0,0 +1,105 @@
+""" A simple example to show how to access a 3D scipy_base.numerix array.  One
+example shows how to access the scipy_base.numerix array using blitz type
+converters and the other shows how it can be done without using blitz
+by accessing the scipy_base.numerix array data directly.
+
+"""
+
+import weave
+from weave import converters
+import scipy_base.numerix
+
+def create_array():
+    """Creates a simple 3D scipy_base.numerix array with unique values at each
+    location in the matrix.
+
+    """    
+    rows, cols, depth = 2, 3, 4
+    arr = scipy_base.numerix.zeros((rows, cols, depth), 'i')
+    count = 0
+    for i in range(rows):
+        for j in range(cols):
+            for k in range(depth):
+                arr[i,j,k] = count
+                count += 1
+    return arr
+
+
+def pure_inline(arr):
+    """Prints the given 3D array by accessing the raw scipy_base.numerix data and
+    without using blitz converters.
+
+    Notice the following:
+      1. '\\n' to escape generating a newline in the C++ code.
+      2. rows, cols = Narr[0], Narr[1].
+      3. Array access using arr[(i*cols + j)*depth + k].
+      
+    """
+    
+    code = """
+    int rows = Narr[0];
+    int cols = Narr[1];
+    int depth = Narr[2];    
+    for (int i=0; i < rows; i++)
+    {
+        for (int j=0; j < cols; j++)
+        {
+            printf("img[%3d][%3d]=", i, j);
+            for (int k=0; k< depth; ++k)
+            {
+                printf(" %3d", arr[(i*cols + j)*depth + k]);
+            }
+            printf("\\n");
+        }
+    }
+    """
+
+    weave.inline(code, ['arr'])
+
+
+def blitz_inline(arr):
+    """Prints the given 3D array by using blitz converters which
+    provides a scipy_base.numerix-like syntax for accessing the scipy_base.numerix data.
+
+    Notice the following:
+      1. '\\n' to escape generating a newline in the C++ code.
+      2. rows, cols = Narr[0], Narr[1].
+      3. Array access using arr(i, j, k).
+      
+    """
+    
+    code = """
+    int rows = Narr[0];
+    int cols = Narr[1];
+    int depth = Narr[2];    
+    for (int i=0; i < rows; i++)
+    {
+        for (int j=0; j < cols; j++)
+        {
+            printf("img[%3d][%3d]=", i, j);
+            for (int k=0; k< depth; ++k)
+            {
+                printf(" %3d", arr(i, j, k));
+            }
+            printf("\\n");
+        }
+    }
+    """
+
+    weave.inline(code, ['arr'], type_converters=converters.blitz)
+
+
+def main():
+    arr = create_array()
+    print "scipy_base.numerix:"    
+    print arr
+
+    print "Pure Inline:"
+    pure_inline(arr)
+    
+    print "Blitz Inline:"
+    blitz_inline(arr)
+    
+
+if __name__ == '__main__':
+    main()