Differences between revisions 2 and 7 (spanning 5 versions)

Iterating through the pixels in the EMData object

In your Python script you can use commands like this to iterate through the pixels in an EMData object

   1 a = test_image()
   2 for k in xrange(a["nz"]):
   3     for j in xrange(a["ny"]):
   4         for i in xrange(a["nx"]):
   5             pixel_value = a[i,j,k] # get the pixel value
   6             a[i,j,k]=pixel_value*3 # set the pixel value

Note that you can do any of:

   1 a[x]
   2 a[x,y]
   3 a[x,y,z]
   4 a[attr_name]

The fourth form allows getting and setting attributes equivalent to set_attr() and get_attr().

-  ⇤ ← Revision 2 as of 2009-03-23 19:39:56 → 
  Size: 414
  Editor: DavidWoolford
  Comment:
+   ← Revision 7 as of 2015-08-14 22:11:14 → ⇥
  Size: 596
  Editor: SteveLudtke
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 4:
-Line 6:
+Line 7:
-for k in a.get_zsize():
    for j in a.get_ysize():
        for i in a.get_xsize():
            pixel_value = a.get(i,j,k) # get the pixel value
            a.set(i,j,k,pixel_value*3) # set the pixel value
+for k in xrange(a["nz"]):
    for j in xrange(a["ny"]):
        for i in xrange(a["nx"]):
            pixel_value = a[i,j,k] # get the pixel value
            a[i,j,k]=pixel_value*3 # set the pixel value
}}}
-Line 12:
+Line 14:
+Note that you can do any of:
-Line 13:
+Line 16:
+{{{#!python
a[x]
a[x,y]
a[x,y,z]
a[attr_name]
}}}
-Line 14:
+Line 23:
-}}}
+The fourth form allows getting and setting attributes equivalent to set_attr() and get_attr().