====== Transport N ======

Transport N is a special type of [[Expression|expression]] that gives the total number of compartments, or discretizations, in the transport. The value is realized just before the [[ODE|ODEs]] are solved, which means that the expression can only use parameters or other constant expressions.

When running a probabilistic simulation, the maximum value returned from the parameter sample sets is used for all iterations.

===== Editing the N block =====

|Note|Most block properties can be edited directly in the [[Blocks_window|blocks window]].|

The block editor is shown by right-clicking the block in a window and selecting **Edit**. In the [[Blocks_window|Blocks window]], you can also show the block editor by selecting the block and clicking the {{:Edit24.png|Edit}} button, or by double-clicking the right-most “validation” column of the block.

The block editor has three tabs:

==== Properties ====

This page lets you edit basic properties such as name, sub-system and base unit. See [[Editing_properties|editing properties]] for more information.

==== Appearance ====

This page lets you edit the visual properties of the block in the [[Matrix_window|Matrix window]]. See [[Editing_appearance|Editing appearance]] for more information.

==== Values ====

**Expression** - Enter either a number or an expression. If you enter an expression that contains references to material dependent blocks, the maximum value of all materials will be used.

===== See also =====

  * [[Transport|Transport]]
  * [[Block|Blocks]]
  * The [[Matrix_window|Matrix window]]