def save(path, figsize=None, dpi=None):
    """Save plot.

    Keyword arguments:
    path -- Destination file path.
    figsize -- w,h figure size tuple in inches.
    dpi -- Dots per inch.
    """
    plt = getPlot()
    if not plt:
        return
    # Backup figure options
    fig = plt.fig
    sizeBack = fig.get_size_inches()
    dpiBack = fig.get_dpi()
    # Save figure with new options
    if figsize:
        fig.set_size_inches(figsize[0], figsize[1])
    if dpi:
        fig.set_dpi(dpi)
    plt.canvas.print_figure(path)
    # Restore figure options
    fig.set_size_inches(sizeBack[0], sizeBack[1])
    fig.set_dpi(dpiBack)
    plt.update()

def ylabel(string):
    """Setup the y label.

    Keyword arguments:
    string -- Title to set.
    """
    plt = getPlot()
    if not plt:
        return
    axes = plt.axes
    axes.set_ylabel(string)
    plt.update()

def title(string):
    """Setup the plot title.

    Keyword arguments:
    string -- Plot title.
    """
    plt = getPlot()
    if not plt:
        return
    axes = plt.axes
    axes.set_title(string)
    plt.update()

def grid(status=True):
    """Show/Hide the grid from the active plot.

    Keyword arguments:
    status -- True if grid must be shown, False otherwise.
    """
    plt = getPlot()
    if not plt:
        return
    plt.grid = status
    axes = plt.axes
    axes.grid(status)
    plt.update()

def legend(status=True, pos=None, fontsize=None):
    """Show/Hide the legend from the active plot.

    Keyword arguments:
    status -- True if legend must be shown, False otherwise.
    pos -- Legend position.
    fontsize -- Font size
    """
    plt = getPlot()
    if not plt:
        return
    plt.legend = status
    if fontsize:
        plt.legSiz = fontsize
    # Hide all legends
    for axes in plt.axesList:
        axes.legend_ = None
    # Legend must be activated on last axes
    axes = plt.axesList[-1]
    if status:
        # Setup legend handles and names
        lines = series()
        handles = []
        names = []
        for l in lines:
            if l.name is not None:
                handles.append(l.line)
                names.append(l.name)
        # Show the legend (at selected position or at best)
        if pos:
            l = axes.legend(handles, names, bbox_to_anchor=pos)
            plt.legPos = pos
        else:
            l = axes.legend(handles, names, loc='best')
            # Update canvas in order to compute legend data
            plt.canvas.draw()
            # Get resultant position
            try:
                fax = axes.get_frame().get_extents()
            except:
                fax = axes.patch.get_extents()
            fl = l.get_frame()
            plt.legPos = (
                (fl._x + fl._width - fax.x0) / fax.width,
                (fl._y + fl._height - fax.y0) / fax.height)
        # Set fontsize
        for t in l.get_texts():
            t.set_fontsize(plt.legSiz)
    plt.update()

def removeSerie(index):
    """Remove a data serie from the active plot.

    Keyword arguments:
    index -- Index of the serie to remove.
    """
    # Get active series
    plt = getPlot()
    if not plt:
        return
    plots = plt.series
    if not plots:
        return
    # Remove line from plot
    axes = plots[index].axes
    axes.lines.pop(plots[index].lid)
    # Remove serie from list
    del plt.series[index]
    # Update GUI
    plt.update()