How to access second axes in the PLOTYY syntax?

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balandong
balandong 2017-10-12
评论： balandong 2017-10-13
Dear all,
This thread is a continuation from the following thread_1. Thanks to Walter for suggesting the code in the thread.
The idea was to add different XTickLabel at the second axes (i.e., ax(2)), specifically to change the label at the bottom X-axis into a set of number. I tried to access the second axis by plugging ax(2), but nothing is changing!.
Similarly, I want to add more instead of default one thicklabel at the second Y-axis. I assume, this too can be done by accessing the second axis.
Here is the code and some illustrative figure to show the intended objective.
Figure
ax = plotyy(st_X_hour, st_Vec_Y1_mean, st_X_hour, st_Y2, @(x,y) errorbar(x, y, st_Vec_Y1_Sd, '--x', 'MarkerSize', 15), @(x,y) plot(x, y, 'k') );
set(ax(1), 'Xtick', st_Xaxis_intrmit, 'XTickLabel',st_XLabel,'XAxisLocation','top');
xtickangle(ax(1), 90);
ylim(ax(1),[0.5 5.5])
nox=273:20:400;
set(ax(2), 'Xtick', nox, 'XTickLabel',1:numel(nox),'XAxisLocation','bottom');
Thanks in advance!

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回答（1 个）

per isakson
per isakson 2017-10-13
编辑：per isakson 2017-10-13
plotyy returns a vector of two axis-handles. (The diagram (before HG2 and I guess in HG2) was two plots on top of each other.)
>> ax = plotyy( (1:3), ones(1,3), (1:3),2*ones(1,3))
ax =
1x2 Axes array:
Axes Axes
>> ax(1)
ans =
Axes with properties:
XLim: [1 3]
YLim: [0 2]
XScale: 'linear'
YScale: 'linear'
GridLineStyle: '-'
Position: [0.1300 0.1100 0.7750 0.8150]
Units: 'normalized'
Show all properties
>> struct(ax(1))
Warning: ....
ans =
CameraPosition: [2 1 17.3205]
CameraPositionMode: 'auto'
CameraPosition_I: [2 1 17.3205]
CameraTarget: [2 1 0]
CameraTargetMode: 'auto'
CameraTarget_I: [2 1 0]
CameraUpVector: [0 1 0]
.............
And with a tool under development
>> dbnv( ax(1), 'YTick' )
YTick: [0 0.5000 1 1.5000 2]
YTick_I: [0 0.5000 1 1.5000 2]
YTickLabel: {5x1 cell}
YTickLabel_I: {5x1 cell}
YTickLabelMode: 'auto'
YTickLabelRotation: 0
YTickLabelRotation_I: 0
YTickLabelRotationMode: 'auto'
YTickLabels: {5x1 cell}
YTickLabels_I: {5x1 cell}
YTickLabelsMode: 'auto'
YTickMode: 'manual'
I'll first fix a problem, then I attach the function, dbnv
  2 个评论
per isakson
per isakson 2017-10-13
编辑：per isakson 2017-10-13
Here is the function, dbnv. It spits out a warning despite I have set the warning off.
The EraseMode property is no longer supported and will error in a future release.
id =
MATLAB:hg:EraseModeIgnored
>> dbnv( ax(1), 'YTick' )
85 opc = warning_off({
Warning: The DrawMode property will be removed in a future release. Use the SortMethod property instead.
> In dbnv>struct_array_ (line 134)
In dbnv (line 91)
Warning: The DrawMode property will be removed in a future release. Use the SortMethod property instead.
> In dbnv>struct_array_ (line 137)
In dbnv (line 91)
>> warning('query', 'MATLAB:hg:EraseModeIgnored' )
The state of warning 'MATLAB:hg:EraseModeIgnored' is 'off'.
balandong
balandong 2017-10-13
Hi Per, Thanks for the reply. I tried to change the bottom X-axis with the following code, but I cant see any changes. I am using 2017a. In addition, I am still vague on how to use the DBNV function. Really appreciate if you can shed some light.
Thank you
ax = plotyy(st_X_hour, st_Vec_Y1_mean, st_X_hour, st_Y2, @(x,y) errorbar(x, y, st_Vec_Y1_Sd, '--x', 'MarkerSize', 15), @(x,y) plot(x, y, 'k') );
set(ax(1), 'Xtick', st_Xaxis_intrmit, 'XTickLabel',st_XLabel,'XAxisLocation','top');
xtickangle(ax(1), 90);
ylim(ax(1),[0.5 5.5])
set(ax(2),'XAxisLocation','bottom');
ax(2).XTick = [200 300];
ax(2).XTickLabel = [200 300];

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