Changeset 7735:5af6ad7bad8c

Timestamp:

12/01/07 18:15:02 (5 years ago)

Author:

R. L. Miller <rlmillster@…>

Branch:

default

Tags:

2.9.rc0

Message:

fixed visualize_structure

File:

• sage/matrix/matrix2.pyx (modified) (4 diffs)

sage/matrix/matrix2.pyx

@@ -2845 +2845 @@
                        the same pixelsize as the matrix dimensions (default: 512)
 
+        EXAMPLE:
+            sage: M = random_matrix(CC, 4)
+            sage: M.visualize_structure()
+
         """
         import gd
         import os
         
-        cdef int x, y, _x, _y, v, bi
+        cdef int x, y, _x, _y, v, bi, bisq
         cdef int ir,ic
         cdef float b, fct
@@ -2876 +2880 @@
         fct = 255.0/(b*b)
         bi = <int>b
+        bisq = bi*bi
 
         im = gd.image((ir,ic),1)
@@ -2887 +2892 @@
         for x from 0 <= x < ic:
             for y from 0 <= y < ir:
+                v = bisq
                 for _x from 0 <= _x < bi:
                     for _y from 0 <= _y < bi:
@@ -2892 +2898 @@
                             v-=1 #increase darkness
 
-                v = int(b*b*fct)
+                v = int(v*v*fct)
                 val = colorExact((v,v,v))
                 setPixel((y,x), val)