fragment.pos.catalog

Syntax

v = fragment.pos.catalog(fg,ic)

Get the fragment position at a state. The fragment position is taken as the average position of the bodies. The fragment position in catalog ic is returned, where ic ranges from 1 to the total number of catalogs. Use the fragment.catalog function or the fragment list command to obtain the catalog information. The fragment.catalog function can be used to obtain the catalog number closest to a specified time.

Returns:

v - fragment position vector

Arguments:

fg - fragment pointer

ic - catalog number

Component Access

f = fragment.pos.catalog (fg)->x

f = fragment.pos.catalog.x(fg,ic)

Get the \(x\)-component of the fragment position.

Returns:

f - \(x\)-component of the fragment position vector

Arguments:

fg - fragment pointer

ic - catalog number

Access other vector components (\(y\), \(z\) (3D ONLY)) by substituting the component name where \(x\) appears above. See Member Access Operator for information about accessing members from data types using ->.

Deprecated Component Access

Component access by adding an optional integer in the function arguments (e.g., f = fragment.pos.catalog(frag, 1, 3)) is deprecated. It remains available but will not be supported in future versions. See Component Access with Integers in FISH on the Deprecated Commands and FISH page for details.

This is hidden. Added to include remaining vector component access functions for inline help.

f = fragment.pos.catalog.y(fg)

f = fragment.pos.catalog.z(fg) (3D ONLY)