Tracking changes as 3D graphics |

It is often very important to see how the result of some analysis changes through time. If that
result is a number, you can simply draw changes as function of one variable - time (use __Instrument values log __). But, if the result
is a signal, for example some FFT sequence, you can
track its changes through the time by creating a 3D graphics. Each time FFT values change, all
its values will be added as one new column in a 3D graphics. You can perform this on FFT
window but also for any other signal or analysis result window in *SIGVIEW*.

You can perform this function in *SIGVIEW *by choosing *Signal tools/Track changes as 3D
graphics *option from the main menu. You will first have to determine the number of columns in 3D
graphics, i.e. how many last signal changes will be stored.

Each time signal the origin signal changes, one new column containing this new signal will be
added to 3D graphics and the ‘oldest’ column will be removed.

X-axis unit will be initially marked as ‘change’,
i.e. the number of signal changes, and the Y-axis
units will be the same as for signal’s X-axis. After few signals
are added to the 3D graphics, X-axis unit and range will be detected automatically by backtracking through the analysis chain to
the root signal window. If X values are equidistant (i.e. difference between two consecutive
values is always the same), those will be display on X-axis of the 3D-graphics. If not, X-axis will
switch again to a "change" unit where each new signal will simply be labeled with its index, i.e.
0,1,2,3,4,...

If the length of origin signal changes (for example by zooming it in/out), its further changes will not
be added to the 3D graphics until you return the signal to the previous (original) length.

For more information see: __Track analysis
results through time as 3D graphics____ __and __Basic 3D
operations __