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--- documentation:language_reference:functions:densitymatrix [2016/10/10 09:41] – external edit 127.0.0.1
+++ documentation:language_reference:functions:densitymatrix [2025/11/20 03:29] (current) – external edit 127.0.0.1
@@ Line 2: / Line 2: @@
 ###
-//DensityMatrix(psi, OrbitalTable)// creates the density matrix of psi $a^{\dagger}_{\tau}a^{\phantom{\dagger}}_{\tau'}$ for the orbitals included in orbitaltable. It returns a table.
+//DensityMatrix(psi, OrbitalTable, options)// creates the density matrix of psi $a^{\dagger}_{\tau}a^{\phantom{\dagger}}_{\tau'}$ for the orbitals included in orbitaltable. It returns a table.
 ###
 ===== Input =====
-  * psi : Wavefunction
+  * psi : Wavefunction or a list of wavefunctions
-  * OrbitalTable : Vector (table) of unsigned integers. Orbitals start at 0.
+  * OrbitalTable : Vector (table) of unsigned integers. Orbitals start at 0. If the table is not given, all orbitals will be included.
+  * options: a list of options. Currently, only one option can be given: { {"Tensor", bool} }, where bool can be true or false. This option can be used when a list of wavefunctions are given. If the option is set to true, the density matrix is taken with respect to all wavefunctions $\langle \psi_{n} | a^{\dagger}_{\tau}a^{\phantom{\dagger}}_{\tau'} | \psi_{n'} \rangle $. The default value is false, where those density matrices with $n = n'$ will be calculated. The output will be a matrix of density matrices.
 ===== Output =====