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plotyy

(Not recommended) Create graph with two y-axes

plotyy is not recommended. Use yyaxis instead.

Syntax

plotyy(X1,Y1,X2,Y2)
plotyy(X1,Y1,X2,Y2,function)
plotyy(X1,Y1,X2,Y2,'function1','function2')
plotyy(AX1,___)
[AX,H1,H2] = plotyy(___)

Description

plotyy(X1,Y1,X2,Y2) plots Y1 versus X1 with y-axis labeling on the left and plots Y2 versus X2 with y-axis labeling on the right.

plotyy(X1,Y1,X2,Y2,function) uses the specified plotting function to produce the graph.

function can be either a function handle or a character vector specifying plot, semilogx, semilogy, loglog, stem, or any MATLAB® function that accepts the syntax

h = function(x,y)

For example,

plotyy(x1,y1,x2,y2,@loglog) % function handle
plotyy(x1,y1,x2,y2,'loglog') % character vector

Function handles enable you to access user-defined local functions and can provide other advantages. For more information on using function handles, see Create Function Handle.

plotyy(X1,Y1,X2,Y2,'function1','function2') uses function1(X1,Y1) to plot the data for the left axis and function2(X2,Y2) to plot the data for the right axis.

plotyy(AX1,___) plots the data using the axes specified by AX1 for the first set of data, instead of using the current axes. Specify AX1 as a single axes object or a vector of the two axes objects returned by a previous call to plotyy. If you specify a vector, then plotyy uses the first axes object in the vector. Use this option with any of the input argument combinations in the previous syntaxes.

[AX,H1,H2] = plotyy(___) returns the handles of the two axes created in AX and the handles of the graphics objects from each plot in H1 and H2. AX(1) is the left axes and AX(2) is the right axes.

Examples

collapse all

Plot two data sets on one graph using two y-axes.

x = 0:0.01:20;
y1 = 200*exp(-0.05*x).*sin(x);
y2 = 0.8*exp(-0.5*x).*sin(10*x);

figure % new figure
plotyy(x,y1,x,y2)

Plot two data sets using a graph with two y-axes. Add a title and axis labels.

x = 0:0.01:20;
y1 = 200*exp(-0.05*x).*sin(x);
y2 = 0.8*exp(-0.5*x).*sin(10*x);

figure % new figure
[hAx,hLine1,hLine2] = plotyy(x,y1,x,y2);

title('Multiple Decay Rates')
xlabel('Time (\musec)')

ylabel(hAx(1),'Slow Decay') % left y-axis
ylabel(hAx(2),'Fast Decay') % right y-axis

Plot two data sets using a graph with two y-axes. Change the line styles. Starting in R2014b, you can use dot notation to set properties. If you are using an earlier release, use the set function instead.

x = 0:0.01:20;
y1 = 200*exp(-0.05*x).*sin(x);
y2 = 0.8*exp(-0.5*x).*sin(10*x);

[hAx,hLine1,hLine2] = plotyy(x,y1,x,y2);
hLine1.LineStyle = '--';
hLine2.LineStyle = ':';

Plot two data sets using a graph with two y-axes. Use a line plot for the data associated with the left y-axes. Use a stem plot for the data associated with the right y-axes.

x = 0:0.1:10;
y1 = 200*exp(-0.05*x).*sin(x);
y2 = 0.8*exp(-0.5*x).*sin(10*x);

figure
plotyy(x,y1,x,y2,'plot','stem')

Plot three data sets using a graph with two y-axes. Plot one set of data associated with the left y-axis. Plot two sets of data associated with the right y-axis by using two-column matrices.

x = linspace(0,10);
y1 = 200*exp(-0.05*x).*sin(x);
y2 = 0.8*exp(-0.5*x).*sin(10*x);
y3 = 0.2*exp(-0.5*x).*sin(10*x);

figure
[hAx,hLine1,hLine2] = plotyy(x,y1,[x',x'],[y2',y3']);

See Also

Functions

Introduced before R2006a

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