How to draw yline on yyaxis on right hand axis?

Hi i am trying to draw a constant line at y axis in a plot for a mean. The issue is yline functions does not plot the yline on right hand axis, does not matter how i input the argument under yyaxis right but when i input the argument under yyaxis left, it plots. Maybe there is something wrong in my code, some can point it out to me.

f6=figure
colororder({'green','red'})
yyaxis right
plot(T2_filtered,"Datetime","Global solar irradiance","LineStyle","-",'Marker','.','MarkerEdgeColor',rgb('brown'))
hold on
ax=gca % tried with and without
yline(mean(T2_filtered.("Global solar irradiance")))% also tried , calaculating mean beforehand
plot(T2_filtered,"Datetime","Emitted longwave irradiance","LineStyle","-","Marker",'.','MarkerEdgeColor',rgb('black'))
ylabel("Irradiance [W/m^2]")
yyaxis left
plot(T2_filtered,"Datetime","Reflected shortwave Irradiance",'LineStyle','-','Marker','.','MarkerEdgeColor',rgb('orange'))
plot(T2_filtered,"Datetime","Reflected Longwave irradiance",'LineStyle','-','MarkerEdgeColor','cyan',"Marker",".")
% plot(T2_filtered, "Datetime", "Aircraft Roll",'Marker','.','MarkerEdgeColor',rgb('orange'))
% plot(T2_filtered, "Datetime", "Aircraft Pitch",'Marker','.','MarkerEdgeColor','g')
% plot(T2_filtered,"Datetime", "Altitude",'Marker','|','MarkerEdgeColor',rgb('silver'))
hold off
title("Short and Long Wave Irradiance")
xlabel("Time[hh:mm:ss]")
ylabel("Irradiance [W/m^2]")
legend(Location='northoutside',NumColumns=2)
grid on
%yline(mean(T2_filtered.("Global solar irradiance"))) % this plots on left axis

Answer 1

[Star Strider]

I don’t have your data, however in this simulation it seems to work correctly —

x =  0:10;
y1 = randn(size(x));
y2 = randn(size(x))*2+5;

figure
yyaxis right
plot(x, y2)
yline(2*pi,'--')                            % Plots Correctly W.R.T. Right 'yyaxis'
yyaxis left
plot(x, y1)

.

[arjun luther]

Hi, thanks for your answer. I have tried to upload the matlab table in the question, maybe you can try with the actual data , if the code works for you.

[Star Strider]

My pleasure!

Use the paperclip icon on the top toolstrip to upload it here. I very rarely go to offline sites to get files.

[arjun luther]

i tried that already but the table is more than 5 mb, so i had to put it on drive to upload it here. Even compressed version was more than 5 mb. Any other ideas, how to share here directly if not via google drive.

[Star Strider]

When I try accessing it, I get:

Google Drive can't scan this file for viruses.

This file is executable and may harm your computer.

Post a safe version, and the code to import it.

.

[arjun luther]

i converted the table to .txt and format and had to compress it twice. Hope fully it can work this time.

[Star Strider]

That works, and the yline call works correctly as well.

I checked it by creating the ‘Check_Value’ variable, and it plots where it should plot, at 460.2 with respect to the right axis —

Ux = unzip('t2.1.zip')

Ux = 1×1 cell array
    {'t2.txt'}

T2_filtered = readtable(Ux{1}, 'VariableNamingRule','preserve')

T2_filtered = 759012×16 table
           Datetime            Latitude    Longitude    Altitude    Aircraft Roll    Aircraft Pitch    Heading    Air Temperature    Reflected shortwave Irradiance    Reflected Longwave irradiance    Global solar irradiance    Emitted longwave irradiance    Aircraft North velocity    Aircraft East velocity    Aircraft down velocity    Ground speed
    _______________________    ________    _________    ________    _____________    ______________    _______    _______________    ______________________________    _____________________________    _______________________    ___________________________    _______________________    ______________________    ______________________    ____________

    2021-07-24T12:53:00.000     53.864      8.2083        96.2           0.4              3.4           78.4           21.4                        37                               420                           750                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.010     53.864      8.2083        96.2           0.4              3.4           78.4           21.4                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.020     53.864      8.2083        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.030     53.864      8.2083        96.2           0.4              3.4           78.4           21.4                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.040     53.864      8.2083        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.050     53.864      8.2083        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.060     53.864      8.2083        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.070     53.864      8.2083        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.080     53.864      8.2083        96.2           0.4              3.4           78.4           21.4                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.090     53.864      8.2084        96.2           0.4              3.4           78.4           21.4                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.100     53.864      8.2084        96.2           0.4              3.4           78.4           21.4                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.110     53.864      8.2084        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.120     53.864      8.2084        96.2           0.4              3.4           78.4           21.4                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.130     53.864      8.2084        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.140     53.864      8.2084        96.2           0.4              3.4           78.4           21.4                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.150     53.864      8.2084        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    

f6=figure;
colororder({'green','red'})
yyaxis right
plot(T2_filtered,"Datetime","Global solar irradiance","LineStyle","-",'Marker','.','MarkerEdgeColor',rand(1,3))
hold on
ax=gca % tried with and without

ax = 
  Axes with properties:

    YAxisLocation: 'right'
            YAxis: [2×1 NumericRuler]
             YLim: [100 800]
             XLim: [Jul 24, 2021, 12:30    Jul 24, 2021, 17:00]
           XScale: 'linear'
           YScale: 'linear'
         Position: [0.1300 0.1100 0.7750 0.8150]
            Units: 'normalized'

  Show all properties

Check_Value = mean(T2_filtered.("Global solar irradiance"))         % Delete

Check_Value = 460.3263

yline(mean(T2_filtered.("Global solar irradiance")))% also tried , calaculating mean beforehand
plot(T2_filtered,"Datetime","Emitted longwave irradiance","LineStyle","-","Marker",'.','MarkerEdgeColor',rand(1,3))
ylabel("Irradiance [W/m^2]")
yyaxis left
plot(T2_filtered,"Datetime","Reflected shortwave Irradiance",'LineStyle','-','Marker','.','MarkerEdgeColor',rand(1,3))
plot(T2_filtered,"Datetime","Reflected Longwave irradiance",'LineStyle','-','MarkerEdgeColor','cyan',"Marker",".")
% plot(T2_filtered, "Datetime", "Aircraft Roll",'Marker','.','MarkerEdgeColor',rgb('orange'))
% plot(T2_filtered, "Datetime", "Aircraft Pitch",'Marker','.','MarkerEdgeColor','g')
% plot(T2_filtered,"Datetime", "Altitude",'Marker','|','MarkerEdgeColor',rgb('silver'))
hold off
title("Short and Long Wave Irradiance")
xlabel("Time[hh:mm:ss]")
ylabel("Irradiance [W/m^2]")
legend(Location='northoutside',NumColumns=2)
grid on

%yline(mean(T2_filtered.("Global solar irradiance"))) % this plots on left axis

I have no idea what ‘rgb’ is, so I just created random vectors for those calls.

.

[arjun luther]

That is so strange. I have tried it on both online as well offline versioin of Matlab, for me it only plots on left hand axis. Rgb is an addon from climate tool box that helps defining colour which are different from basic matlab pre defined colors. I used it as experiment before, never changed the code back.

Any other suggestions, what can i do about the main problem.

[Star Strider]

I searched the online documentation and could not find any reference to ‘rgb’ and I have never heard of the Climate Toolbox. (I assume it must be a FEX contribution.)

The only conclusion I can come up with is that the Climate Toolbox itself may be causing problems with the yline call, since it works correctly here. It may have its own version of yyaxis or yline, or it may tweak it in some way. (You might also mention this as a comment to the Climate Toolbox FEX page, since it may be a bug.)

I would just save the data (as you did here), close the Climate Toolbox, and plot it after that, since that works. As far as the ‘rgb’ call goes, just choose an appropriate colormap and index into it, or create your own matrix of colours.

[arjun luther]

I tried, disabling the add on , but still same result. It's so annoying that such a simple task cannot be done. I m considering making vector of same size that contains the value of mean , say 460.2 and than plot it as normal line plot.

[Star Strider]

The easiest way to do that would be:

plot(xlim,[1 1]*mean(T2_filtered.("Global solar irradiance")), '-k')

Adding that here just after the first hold call in yyaxis right —

Ux = unzip('t2.1.zip')

Ux = 1×1 cell array
    {'t2.txt'}

T2_filtered = readtable(Ux{1}, 'VariableNamingRule','preserve')

T2_filtered = 759012×16 table
           Datetime            Latitude    Longitude    Altitude    Aircraft Roll    Aircraft Pitch    Heading    Air Temperature    Reflected shortwave Irradiance    Reflected Longwave irradiance    Global solar irradiance    Emitted longwave irradiance    Aircraft North velocity    Aircraft East velocity    Aircraft down velocity    Ground speed
    _______________________    ________    _________    ________    _____________    ______________    _______    _______________    ______________________________    _____________________________    _______________________    ___________________________    _______________________    ______________________    ______________________    ____________

    2021-07-24T12:53:00.000     53.864      8.2083        96.2           0.4              3.4           78.4           21.4                        37                               420                           750                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.010     53.864      8.2083        96.2           0.4              3.4           78.4           21.4                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.020     53.864      8.2083        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.030     53.864      8.2083        96.2           0.4              3.4           78.4           21.4                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.040     53.864      8.2083        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.050     53.864      8.2083        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.060     53.864      8.2083        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.070     53.864      8.2083        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.080     53.864      8.2083        96.2           0.4              3.4           78.4           21.4                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.090     53.864      8.2084        96.2           0.4              3.4           78.4           21.4                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.100     53.864      8.2084        96.2           0.4              3.4           78.4           21.4                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.110     53.864      8.2084        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.120     53.864      8.2084        96.2           0.4              3.4           78.4           21.4                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.130     53.864      8.2084        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.140     53.864      8.2084        96.2           0.4              3.4           78.4           21.4                        37                               420                           749                          335                          11                        59.3                       0                   70.3    
    2021-07-24T12:53:00.150     53.864      8.2084        96.2           0.4              3.4           78.4           21.5                        37                               420                           749                          335                          11                        59.3                       0                   70.3    

f6=figure;
colororder({'green','red'})
yyaxis right
plot(T2_filtered,"Datetime","Global solar irradiance","LineStyle","-",'Marker','.','MarkerEdgeColor',rand(1,3))
hold on
ax=gca % tried with and without

ax = 
  Axes with properties:

    YAxisLocation: 'right'
            YAxis: [2×1 NumericRuler]
             YLim: [100 800]
             XLim: [Jul 24, 2021, 12:30    Jul 24, 2021, 17:00]
           XScale: 'linear'
           YScale: 'linear'
         Position: [0.1300 0.1100 0.7750 0.8150]
            Units: 'normalized'

  Show all properties

Check_Value = mean(T2_filtered.("Global solar irradiance"))         % Delete

Check_Value = 460.3263

plot(xlim,[1 1]*mean(T2_filtered.("Global solar irradiance")), '-k')    % <— ADDED
% yline(mean(T2_filtered.("Global solar irradiance")))% also tried , calaculating mean beforehand
plot(T2_filtered,"Datetime","Emitted longwave irradiance","LineStyle","-","Marker",'.','MarkerEdgeColor',rand(1,3))
ylabel("Irradiance [W/m^2]")
yyaxis left
plot(T2_filtered,"Datetime","Reflected shortwave Irradiance",'LineStyle','-','Marker','.','MarkerEdgeColor',rand(1,3))
plot(T2_filtered,"Datetime","Reflected Longwave irradiance",'LineStyle','-','MarkerEdgeColor','cyan',"Marker",".")
% plot(T2_filtered, "Datetime", "Aircraft Roll",'Marker','.','MarkerEdgeColor',rgb('orange'))
% plot(T2_filtered, "Datetime", "Aircraft Pitch",'Marker','.','MarkerEdgeColor','g')
% plot(T2_filtered,"Datetime", "Altitude",'Marker','|','MarkerEdgeColor',rgb('silver'))
hold off
title("Short and Long Wave Irradiance")
xlabel("Time[hh:mm:ss]")
ylabel("Irradiance [W/m^2]")
legend(Location='northoutside',NumColumns=2)
grid on

%yline(mean(T2_filtered.("Global solar irradiance"))) % this plots on left axis

Thst should work, since the first plot call after the hold call after yyaxis right plotted correctly. (I generally use hold on and hold off together for each separate yyaxis call, although it may not make any significant difference.)

.

[arjun luther]

Thanks for your input as well as suggestions. It will get me going now. It would be really insightful if you could explain a little about this line of the code

"plot(xlim,[1 1]*mean(T2_filtered.("Global solar irradiance")), '-k')

what is happening here. How does multiplying the mean value with limits of x gets the trick done. Does xlim, [1 1] gets the whole x-axis? Thanks, once again

[Star Strider]

As always, my pleasure!

The plot call uses the (1x2) xlim vector (defining the limits of the x-axis) as the independent variable argument, and the (1x2) vector [1 1] that is multiplied by the value of ‘mean(T2_filtered.("Global solar irradiance"))’ as the dependent variable argument, to produce a constant horizontal line at that value. Because it uses xlim as the independent variable argument, it will automatically re-size to span the entire x-axis if the x-axis limits are changed. It defines the line style as a constant black line using the '-k' argument.