Diff for "EMAN2/Tutorials/ri2ap"

Differences between revisions 2 and 4 (spanning 2 versions)

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.ri2ap()

In [7]:  e.get(2,0,0)
Out[7]:  62.0

In [8]:  e.get(3,0,0)
Out[8]:  3.1415927410125732

-  ⇤ ← Revision 2 as of 2008-02-12 23:07:18 → 
  Size: 381
  Editor: DavidWoolford
  Comment:
+   ← Revision 4 as of 2008-02-12 23:11:45 → ⇥
  Size: 702
  Editor: DavidWoolford
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 1:
-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 a Fourier transform on it:
+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:
 Line 12:
-In [4}:  e.do_fft_inplace()
+In [4]:  e.process_inplace("testimage.axes")

In [5]:  e.do_fft_inplace()
-Line 15:
+Line 17:
+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.ri2ap()

In [7]:  e.get(2,0,0)
Out[7]:  62.0

In [8]:  e.get(3,0,0)
Out[8]:  3.1415927410125732

}}}