User guide

Charnwood Dynamics Ltd. Coda cx1 User Guide – Reference IV-2
CX1 USER GUIDE - COMPLETE.doc 26/04/04 144/162
Calculated data
The following data types are data which has been derived from the acquisition data stored in
data types 0 - 29. It has been calculated by algorithms in the Motion Analysis program. This
data is not normally recorded in a data file, but some may be included as a means of
exporting it to another application program that does not have the same calculation
algorithms. Calculated data may be stored to enable faster searching in statistical analyses.
The calculated data types correspond to data types which are available for plotting on
graphs.
If any calculated data is stored, there will also be entries of data types 50, 51, & 52: these
data arrays specify attributes for all the calculated data variables which are stored in data
types 53 - 70.
The calculated data is normally stored only for the zoomed-in time period defined in Data
type 15 (if present), but this option may be de-selected by the user in the Data Save Options
dialogue which appears during a File: Save As... procedure.
The time resolution of calculated data is the same as the acquired marker data (Data type 7)
The number of arrays of each data type which are saved from Motion Analysis is dependent
on the Setup configuration in use at the time the file is saved. The data types which are
saved are selected by the user in the Data Save Options dialogue during the File: Save As...
procedure.
50 Calculated-data channel names:
These are the (user-assigned) names of each channel of each calculated data type stored in the Data
Section. (These are copies of the data channel names stored in the Setup file, if the Setup configuration is
saved.) There is one array of names for each data variable type stored (of types 53-70). Within each array
the channel names are separated by a Tab character (ASCII 9)
51 Calculated-data data-type names:
These are the internal type-names of each array of data of types 53-70 which are stored.
These names should correspond to the description of data types 53-70; they are the enumerated DataTypes
defined in the datadef.h header file of the ANALYSE source code.
This data is included as a consistency check; it may be omitted.
52 Calculated-data resolution:
This is a 2-dimensional array which specifies the unit-resolution and time-resolution of all the calculated data
arrays, in the order [unit-resolution, time-resolution].
Calculated data is stored as 16-bit integers, and must be multiplied by the unit-resolution value to get data
values in standard units (i.e. m, N, µV, ms
-1
, degrees, etc.).
53 Calculated Marker Positions:
The interpolated and filtered marker position data (for the zoomed-in time-period).
54 Calculated Force:
55 Calculated Force Vector:
56 Calculated EMG:
57 Calculated Velocity:
58 Calculated Acceleration:
59 Calculated Angle:
60 Calculated AngularVelocity :