Differences

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--- exercises:common:chg [2022/10/31 17:35] – jglan
+++ exercises:common:chg [2023/12/04 13:49] (current) – fnunes
@@ Line 12: / Line 12: @@
 cubecruncher.x -i AB.cube   -subtract A.cube -o AB_A.cube
 cubecruncher.x -i AB_A.cube -subtract B.cube -o chg_dif.cube
+</code>
+This type of analysis is also useful in the case of time-dependent calculations. In this case, the difference would be taken over time, with respect to some reference snapshot (e.g. ground state).
+$\Delta \rho (t-t_0) = \rho(t) - \rho(t_0)$,
+where $\rho(t)$ is the electron density at time $t$, and $\rho(t_0)$ is the reference electron density.
+<code>
+cubecruncher.x -i elec_dens_t.cube -subtract elec_dens_t0.cube -o diff_t-t0.cube
 </code>