How can I add a third axis to a plot

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Heidi Hirsh
Heidi Hirsh 2020-2-11
评论： Adam Danz 2020-2-11
I made a figure using yyaxis to plot two different kinds of data on the same plot. I want to add a third timeseries with a y-axis unique from the first two. I found the plotyyy function but one of my axes has three unique lines and it looks like plotyyy only allows one set of data per axis. Is there a straightforward way to add a third axis to the plot I already have?
Thank you in advance!
f4=figure(4)
box on
yyaxis left
hold on
plot(MX,pkdosat_ns_1d,'-','color',[.4 .6 .6],'linewidth',2)
plot(MX,DO3_1d,'-','color','b','linewidth',2) %[.4 .4 .4]
plot(MX,poDO4_1d,'-.','color','b','linewidth',2)
ylim([90 450])
ylabel('oxygen')
% new fronds
yyaxis right
hold on
plot(date_nf_off,newfrond,'.','markersize',37,'Color','r')
ylabel('New Fronds')
ylim([-1.5 7])
ax=gca; % make y axes black
ax.YAxis(1).Color='k'
ax.YAxis(2).Color='k'
set(gca,'fontsize',16)
x = datenum('June-27-2018'):7:datenum('Oct-3-2018');
set(gca, 'XTick', x);
datetick('x','mm/dd','keepticks');
% set(gca,'XTickLabel','');
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Heidi Hirsh
Heidi Hirsh 2020-2-11
Hey Adam,
By scaling the data do you mean replacing my current y values with values that fit one of my current axes at equal intervals. The axis I want to add has values from 0 to 5 (much smaller than the other two). See powerpoint mock up I attached.
I'm not sure how to set up transparent axes on top. Sorry!
Adam Danz
Adam Danz 2020-2-11
After plotting all of the data on the yyaxis, set the xlim and ylim so it doesn't change. That's important.
Let's say the new data you want to add on an independent y axis is called data and you want to scale it to the left yyaxis. Let's say that the values in data range from 0 to 5 but you want it in the middle of the y axis range as shown in the picture you shared.
The following are the basic steps you'll need to take. This is untested (again, I don't have access to Matlab right now).
1) Get the y-axis range for the left yyaxis
yyaxis left
leftAxisRange = ylim();
2) set the desired axis limits for the new data axis
data = 1:5; % Your data values (I'm making these up)
dataAxisRange = [-3 7]; % these are the limits you'd like for the new axes
4) Now you have to scale data to the left yaxis range while factoring in the data axis range.
dataScaled = ((data - dataAxisRange(1)) / range(dataAxisRange)) * range(leftAxisRange) + leftAxisRange(1);
5) plot the data using the left axis
yyaxis left
plot(x, dataScaled)
6) You'll have to add pseudo axis ticks that are really just text objects next to the axes.
xl = xlim();
yTicks = -1:6;
% This next line is the same exact scaling we did above.
yTicksScaled = ((yTicks - dataAxisRange(1)) / range(dataAxisRange)) * range(leftAxisRange) + leftAxisRange(1);
yTickXvals = repmat(xl(1), size(yTicksScaled));
yTickLabels = strsplit(num2str(yTicks));
text(yTickXvals, yTicksScaled, yTickLabels, 'HorizontalAlignment', 'Left')

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