# multiple plots in one figure with left and rigt y-axis with different units

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Safiya on 24 Dec 2015
Commented: Walter Roberson on 28 Dec 2015
Hi , I have 5 data sets. i would like to plot data1 to data3 (voltage V) on left y-scale and data4, 5 (current mA) on right y-axis.
data1 to data3 : min = 0 max=4.7V
data 4 , 5 : min =100mA , max 800mA
thanks
dpb on 24 Dec 2015
See
doc plotyy

Arnab Sen on 28 Dec 2015
Edited: Walter Roberson on 28 Dec 2015
It is my understanding that you would like to plot for both left and right Y-axis for different datasets. For this purpose, you can create multiple axes using 'axes' function and plot the datasets referring the appropriate axes as the argument.
The following example will illustrate how to achieve the above
%Construct the left Y-axes
>> ax1=axes('XAxisLocation','bottom',...
'YAxisLocation','left',...
'Color','none',...
'XColor','k',...
'YColor','r',...
% Construct the right Y-axis
>> ax2=axes('XAxisLocation','bottom',...
'YAxisLocation','right',...
'Color','none',...
'XColor','k',...
'YColor','r',...
% Put the labels of all the axes
>> xlabel(ax1,'Xlabel')
>> ylabel(ax1,'Voltage(V)')
>> ylabel(ax2,'Current(ma)')
% Plot the datasets in appropriate axes
>> plot(ax1,x,data1,'color',rand(1,3));
>> plot(ax1,x,data2,'color',rand(1,3));
>> plot(ax1,x,data3,'color',rand(1,3));
>> plot(ax2,x,data4,'color',rand(1,3));
>> plot(ax2,x,data5,'color',rand(1,3));
if you have only two datasets one for each left and right Y axis, you can simply use 'plotyy' function instead.
You may use various properties of the lines by by setting appropriate arguments in 'plot' function call.
Refer to the following link for more detail of 'plot', 'axes' and 'plotyy' functions:
Walter Roberson on 28 Dec 2015
There are also file exchange contributions such as plotyyy