MATLAB: Double y-axis plot

double-ploty axis

Hi I have a 495×4 matrix. In column 1 are datenum values, column 2,3 and 4 contain data. I want to plot the data from all 3 columns on one plot. The data from column 2 and 3 should be for the y-axis on the left and the data from column 4 for the y-axis on the right. I should therefore have 3 lines on the plot.
I know it is possible to plot 2 lines with plotyy. How would I plot 3 lines ? Is it possible to do this a different way ?
I am using MATLAB 2011b

Best Answer

"column 1 are datenum values, ... column 2 and 3 ... on the left and ... column 4 on the right"
Nothing to it... :)
[hAx,hL1,hL2]=plotyy(data(:,1),data(:,2:3),data(:,1),data(:,4));
set(hAx(2),'xtick','[])           % just don't show but one x axis ticks, etc., ...
linkaxes(hAx,'x')                 % and link the two so stay in synch on limits, etc., ...
datetick(hAx,'x','keeplimits')    % and turn to date format
May need to change format and number ticks, etc., to match the data but that's the starting point
Related Question