# vssBlockInitializeFlag

Flag used in custom blocks called at the start of a simulation to perform actions upon the initialization of the simulation, such as allocating memory, opening a file or a channel.

## Syntax

flagout = vssBlockInitializeFlag

## Outputs

flagout
Output of flag.
Type: logical
Dimension: Boolean

## Example

Flag used in an OML Custom Block to read a CSV file upon the simulation initialization.

function OmlBlockFunction(block,flag)
...
if flag == vssBlockInitializeFlag