why is the green graph (pco2) not coming in the complete range of x-axis? However it is covering the complete range. i have used plotyyy function to create multi y axis plot.

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[KSSV]

It is because: you might ve having data from there...or the respective sst values are NaN's. Check your data.

[abishek dixit]

i have checked the data and tried to plot it in the excel as well (snapshot attached). Also data points for all four variable are same (573), this eliminates the possibility of NaNs.

i am attaching the code can you identify the discrepancy?

t=datenum(2013,11,24):datenum(2015,06,19);
ax=plotyyy(t',sst,t',pco2,t',sss);
datetick('x','mmm-yy')
set(ax(1),'XTick',[])
xlabel('Time')
ylabel(ax(1),'SST (^{o}C)')
ylabel(ax(2),'pCO2(\muatm)')
ylabel(ax(3),'SSS(PSU)')

[dpb]

"...data points for all four variable are same (573), this eliminates the possibility of NaNs."

Just length() being same does NOT eliminate the possibility of NaN values.

Try

sum(isnan(pco2))

There are only two lines on the other plot which appear to be the red and blue lines of the first so there's no indication it plotted anything for the green line...

W/o the data there's little more we can do...

[abishek dixit]

...Just length() being same does NOT eliminate the possibility of NaN values.

Thanks for the information. But the recommended function also tells that there are not NaNs are present in the data.

_ W/o the data there's little more we can do

the data https://docs.google.com/spreadsheets/d/1tdLh7QbFc2-7j4J3Ixu0FjOq1ktEutneMxRJIvRH6j8/edit?usp=sharing

[dpb]

OK, data isn't the issue...see Answer once noticed the non-standard function...but when using the forum, attach data here; don't ask folks to go somewhere else when all the tools are here in one spot.

Answer 1

[dpb]

Oh; my eyes missed the third 'y' in plotyyy; that must be a FEX submittal.

ax=plotyyy(t',sst,t',pco2,t',sss);
datetick('x','mmm-yy')
set(ax(1),'XTick',[])

The problem isn't the y data, it's that you haven't set all three axes to the same range and labelling with datetick and/or xlim to make them match up. Which is the target of the one datetick call is whichever was that returned by gca at the time; you need to pass the axes handles array to it...

datetick(ax,'x','mmm-yy')
set(ax(2:3),'XTick',[])

Probably best practice would be you also use linkaxes to link the three x-axes so they will remain in concert automagically...see

doc linkaxes % for details there.