How to draw yline on yyaxis on right hand axis?

Question

arjun luther 2023-7-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1999253-how-to-draw-yline-on-yyaxis-on-right-hand-axis

评论： Star Strider 2023-7-23

t2.1.zip

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

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Answer 1

Star Strider 2023-7-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1999253-how-to-draw-yline-on-yyaxis-on-right-hand-axis#answer_1276933

在 MATLAB Online 中打开

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)

.

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Star Strider 2023-7-22

在 MATLAB Online 中打开

t2.1.zip

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.

.

Star Strider 2023-7-22

在 MATLAB Online 中打开

t2.1.zip

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 2023-7-22

在 MATLAB Online 中打开

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 2023-7-23

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.

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