Differences between revisions 6 and 7
⇤ ← Revision 6 as of 2012-06-18 04:49:44 →
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Editor: SteveLudtke
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.
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for k in a["nz"]:
    for j in a["ny"]:
        for i in a["nx"]:		 for k in xrange(a["nz"]):
    for j in xrange(a["ny"]):
        for i in xrange(a["nx"]):

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().

EMAN2/Tutorials/iter_pixels (last edited 2015-08-14 22:11:14 by SteveLudtke)