Diff for "EMAN2/Tutorials/ri2ap"

Differences between revisions 4 and 5

Changing image format from real/imaginary to amplitude/phase format in EMAN2 is a straightforward procedure. To illustrate the process start with a test image and perform an inplace Fourier transform on it:

[someone@localhost]$ e2.py

Welcome to EMAN2
Prompt provided by IPython
Enter '?' for ipython help

In [3]:  e = EMData(32,32,32)

In [4]:  e.process_inplace("testimage.axes")

In [5]:  e.do_fft_inplace()

You now have an EMData object (e) in real/imaginary format. To convert the image to amplitude/phase format simply do the following

In [6]:  e.is_ri()
Out[6]:  True

In [7]:  e.ri2ap()

In [8]:  e.is_ri()
Out[8]:  False

In [9]:  e.get(2,0,0)
Out[9]:  62.0

In [10]:  e.get(3,0,0)
Out[10]:  3.1415927410125732

Note that it's relatively straightforward to access values from the EMData object (e) using the get function call. Also, you can convert back to to real/imaginary format by doing

In [11]:  e.ap2ri()

In [12]:  e.is_ri()
Out[12]:  True

-  ⇤ ← Revision 4 as of 2008-02-12 23:11:45 → 
  Size: 702
  Editor: DavidWoolford
  Comment:
+   ← Revision 5 as of 2008-02-12 23:15:33 → ⇥
  Size: 1037
  Editor: DavidWoolford
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 22:
-In [6]:  e.ri2ap()
+In [6]:  e.is_ri()
Out[6]:  True
-Line 24:
+Line 25:
-In [7]:  e.get(2,0,0)
Out[7]:  62.0
+In [7]:  e.ri2ap()
 Line 27:
-In [8]:  e.get(3,0,0)
Out[8]:  3.1415927410125732
+In [8]:  e.is_ri()
Out[8]:  False

In [9]:  e.get(2,0,0)
Out[9]:  62.0

In [10]:  e.get(3,0,0)
Out[10]:  3.1415927410125732
-Line 31:
+Line 37:
+Note that it's relatively straightforward to access values from the EMData object (e) using the get function call. Also, you can convert back to to real/imaginary format by doing

{{{

In [11]:  e.ap2ri()

In [12]:  e.is_ri()
Out[12]:  True

}}}