Secondary Axis

Using secondary axis in overlaid graphs can improve its visualization.
  • Define principal and secondary graphs.
  • Set the option 'useSecondaryAxis' to true into the options of the secondary graph.
  • Set the option 'y2AxisColor' to the same color of the secondary graph.

One line using a secondary axis

If the option 'y2AxisColor' is not defined, the secondary y-axis color by default will be black.

The option 'y2AxisColor' must be defined into the options of the secondary graph.

⎘ 
x = 0:0.1:2*pi 			
% defining X values

			
op1 = struct		 	
% initializing options struct, principal graph options

op1.show = false
op1.lineStroke = 'purple'
s1 = plot(x,cos(x),op1)		
% principal graph


op2 = op1		 	
%  initializing options struct, secondary graph options

op2.lineStroke = 'orange'
op2.useSecondaryAxis = true	
% secondary axis

op2.y2AxisColor = 'orange'	
% same color as the line to which it refers

s2 = plot(x,sin(x)*1000,op2)	
% secondary graph


overlay({s1,s2})

More than one lines using a secondary axis

If the option 'y2AxisColor' is not defined, the secondary y-axis will be black.

The option 'y2AxisColor' must be defined into the options of the first graph with secondary options.

To have the same color for all the lines refering to the secondaty y-axis it's necesary to set their color manually for each line.

⎘ 
x = 1: 0.2: 10 			
% defining X alues

			
o1 = struct			
% initializing options struct

o1.show = false 
c1 = area(x, cos(x), o1) 	
% principal graph


o2 = o1 			
% initializing options struct

o2.useSecondaryAxis = true	
% first line with secondary axis

o2.lineStroke = 'red'
o2.y2AxisColor = 'red'		
% same color as the line to which it refers

c2 = plot(x, sin(x), o2)	
% secondary graph


o3 = o1				
% initializing options struct

o3.useSecondaryAxis = true	
% second line with secondary axis

o3.markerStroke = 'red'
o3.useSecondaryAxis = true
c3 = scatter(x, 2*cos(x+2), o3)
% secondary graph


overlay({c1,c2,c3})

Related functions

plotyy | plot | scatter