## Differences
Between Solutions

The *Differences..*.
menu item from the Solve menu can be used to compare temperatures
node-by-node for two identical solution meshes. The two solutions
must have exactly the same number of nodes, and the same time points
if unsteady. The *Differences...*
calculation is therefore most useful for displaying the effects of
changes in power dissipation or material properties, but not for
comparing the effects of changes in dimensions or the number of
gates.

Starting with a solution already
loaded and displayed, the *Differences...*
menu item opens a file dialog that lets
the user select a solution file to subtract from the solution in
memory. The temperature at each node from the file is subtracted from
the temperature at that same node in memory. The result is a 3D
distribution of the temperature differences expressed relative to
0ºC.
The differences are only meaningful in Celsius, so the temperature
scale is changed to Celsius and the graphical display updated.
Slicing, plotting, snapshot and other commands can then used to
further investigate the differences solution.

**Differences smaller than -273.15 C will not display
correctly**,
because only positive temperatures (in Kelvin) may exist in a
solution. Take this into account when choosing the order of
differencing. Load the hottest solution first, then use
*Differences...*
to subtract a cooler solution, so that the largest differences will
be positive and will display correctly.

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