assignin( workspace, variable, value )
    Assigns a value to a variable in a specified workspace.

    Parameters
    ----------
    workspace: string
        Workspace name.

    variable: string|symbol
        Variable name.

    value: any
        Value to assign.

    Examples
    --------
    > assignin( 'base', 'x', 3.14 );
    > x

    See Also
    --------
    assignfrom, varsWorkspace, workspace, workspaces