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Use newplot to Control Plotting

This example shows how to prepare figures and axes for user-written plotting functions.

Use newplot to manage the output from specialized plotting functions. The myPlot2D function:

  • Customizes the axes and figure appearance for a particular publication requirement.

  • Uses revolving line styles and a single color for multiline graphs.

  • Adds a legend with specified display names.

Note

Starting in R2014b, you can set properties using dot notation. If you are using an earlier release, use the set function instead, such as set(cax,'FontName','Times').

function myPlot2D(x,y)
   % Call newplot to get the axes handle
   cax = newplot;
   % Customize axes
   cax.FontName = 'Times';
   cax.FontAngle = 'italic';
   % Customize figure
   fig = cax.Parent;
   fig.MenuBar= 'none';
   % Call plotting commands to
   % produce custom graph
   hLines = line(x,y,...
      'Color',[.5,.5,.5],...
      'LineWidth',2);
   lso = ['- ';'--';': ';'-.'];
   setLineStyle(hLines)
   grid on
   legend('show','Location','SouthEast')
   function setLineStyle(hLines)
      style = 1;
      for ii = 1:length(hLines)
         if style > length(lso)
            style = 1;
         end
         hLines(ii).LineStyle = lso(style,:);
         hLines(ii).DisplayName = num2str(style);
         style = style + 1;
      end
   end
end

This graph shows typical output for the myPlot2D function:

x = 1:10;
y = peaks(10);
myPlot2D(x,y)

The myPlot2D function shows the basic structure of a user-written plotting functions:

  • Call newplot to get the handle of the target axes and to apply the settings of the NextPlot properties of the axes and figure.

  • Use the returned axes handle to customize the axes or figure for this specific plotting function.

  • Call plotting functions (for example, line and legend) to implement the specialized graph.

Because myPlot2D uses the handle returned by newplot to access the target figure and axes, this function:

  • Adheres to the behavior of MATLAB® plotting functions when clearing the axes with each subsequent call.

  • Works correctly when hold is set to on

The default settings for the NextPlot properties ensure that your plotting functions adhere to the standard MATLAB behavior — reuse the figure window, but clear and reset the axes with each new graph.