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e2eulerxplor: EMAN2's EulerXplor Tool


The four interfaces in e2eulerxplor. See the table below for more details

Figure Label



This is a graphical depiction of orientations on the asymmetric unit. Click on one of the dots to display the associated class average and projection as shown in C. The color of the dot in the asymmetric unit shows the relative number of particles in the class: Blue indicates a class with a lot of particles in it, red indicates a class with few particles in it. White is in between.


This is main inspector, this appears when you middle click on A. You can select different refinement iterations to investigate how the class averages and aligned particles are changing through time.


Projection (left) and class average corresponding to selected orientation (yellow) in A


Aligned particles that formed the class average shown in C (right). If you select the projection in C (left) these particles will be shown unaligned. Blue squares indicate that the particle did not make it into the final class average

Mouse Handling

Mouse Action


left button release

Select a cylinder/dot in A, resulting in update of the image in B (below) or C above

Right button drag

x and y movement

Shift + right button drag

z movement

Mouse wheel in and out

Zoom in and out, respectively

Left button drag

Object rotation, quaternion based

Middle button

Show inspector (B)

Inspecting EMData lists with euler_display from

You can open a list of EMData's with the EulerXplor tool if and only if they all have the xform.projection header attribute. Here is an example:

   1 a = EMData()
   2 b = a.read_images("bdb:refine_00#projections_00")
   3 euler_display(b)

Note that all projection and class average images produced by e2workflow have the xform.projection header attribute, which are located in directories called"refine_??" - you're safe to try this out using those images.


Typical screenshot of the Eulerxplor tool, launched using euler_display from

Figure Label



Symmetrized orientation distribution. Cylinder heights are proportional to the "ptcl_repr" header attribute. You can change the header attribute that is represented by the cylinder height in the inspector (bottom of C)


The image corresponding to the selected (yellow) cylinder.


The inspector. Note you can uniformly enlarge the displayed cylinders using the "Point Height" and "Point Width" sliders

Specialized Mouse Handling

When you open a list of EMData objects from Python Eulerxplor handles mouse events slightly differently. The only way to view an image associated with a point on the sphere is to hold shift and click on it.

Mouse Action


Shift + left click

Select a cylinder in A, resulting in update of the image in B

Inspecting Transform lists with euler_display from

Similarly you can look at a list of Transforms with the EulerXplor tool, using this syntax:

   1 sym = Symmetries.get("c1")
   2 orients = sym.gen_orientations("eman",{"delta":3,"inc_mirror":True})
   3 euler_display(orients)

EMAN2/Programs/e2eulerxplor (last edited 2009-07-24 02:42:48 by bcm-10-134)