The GetSize command returns the number of nodes at level i of the tree T. See GetDescendants for more details about node indexing.

$\mathrm{with}\left(\mathrm{Finance}\right)\:$

$M≔\mathrm{VasicekModel}\left(0.05\,0.03\,0.5\,0.03\right)$

$M≔\mathbf{module}\left(\right)\mathbf{end\; module}$

$T≔\mathrm{ShortRateTree}\left(M\,3\,20\right)$

$T≔\mathbf{module}\left(\right)\mathbf{end\; module}$

$\mathrm{TreePlot}\left(T\,\mathrm{thickness}=2\,\mathrm{axes}=\mathrm{BOXED}\,\mathrm{gridlines}=\mathrm{true}\right)$

$\mathrm{GetSize}\left(T\,1\right)$

$1$

$\mathrm{GetSize}\left(T\,2\right)$

$3$

$\mathrm{GetSize}\left(T\,3\right)$

$5$

$\mathrm{GetSize}\left(T\,10\right)$

$15$

$\mathrm{GetSize}\left(T\,11\right)$

$15$

The Finance[GetSize] command was introduced in Maple 15.

For more information on Maple 15 changes, see Updates in Maple 15.