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Two Y axes not lining up (semilogx for one, line for the other)

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Aaron Burdick
Aaron Burdick 2011-9-29
Hi there,
I have two sets of axes set up. On the first (left Y and bottom X) I am plotting a "semilogx" function to plot. On the second set of axes (right Y and top X) I am simply using a "line" function to plot. The tick marks are set up the same on both (except that I manually changed the labels for the right Y axis) - they should be at 800, 600, 400, 200. The two Y axis tick marks line up fine when I am using a simple "line" function for the first set of axes. BUT when I use a "semilogx" function, for some reason the right Y axis gets these odd misalignments. Here is a sample:
http://www.aaronburdick.com/Other/Randomfor-personal-use/18570968_kxb4jj#1504207519_P4s68jn-A-LB
Any help would be appreciated!
Thank you!
Aaron
  1 个评论
Aaron Burdick
Aaron Burdick 2011-9-29
Here's the code I'm using:
hl1 = semilogx(basinput,bas_hpa,'Color',[0 0 0],'linewidth',2);
ax1 = gca;
set(ax1,'XColor',[0 0 0],'YColor',[0 0 0],'Parent',figure1,'YTickLabel',{'200','400','600','800','1000'},...
'YTick',[200 400 600 800 1000],...
'YMinorTick','on',...
'YDir','reverse',...
'XMinorTick','on',...
'Position',[0.13 0.112403846153846 0.710158478605388 0.793461538461539],...
'FontSize',16,...
'FontName','Times');
axis tight;
THEN LATER FOR THE LINE GRAPH:
ax2 = axes('Position',get(ax1,'Position'),...
'XAxisLocation','top',...
'YAxisLocation','right',...
'YTick',[200 400 600 800 1000],...
'YTickLabel',{'11.8','7.18','4.20','1.95',''},...
'YMinorTick','off',...
'XMinorTick','on',...
'YDir','reverse',...
'FontSize',16,...
'FontName','Times',...
'Position',[0.13 0.112403846153846 0.710158478605388 0.793461538461539],...
'Color','none',...
'XColor','k','YColor','k');
hl2 = line(difpercent,dif_hpa,'Parent',ax2,'Color',[0 0 0],...
'linewidth',2,'linestyle',':');

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回答（1 个）

Walter Roberson
Walter Roberson 2011-9-29
For this kind of plotting, one would normally use plotyy(), specifying the plotting functions to use:
plotyy(x1,y1,x2,y2,@semilogy,@plot)
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Walter Roberson
Walter Roberson 2011-9-29
Yes: you can set the XAxisLocation property for one of the axes to 'top', and you can set its XTick and XTickLabel at will.
Aaron Burdick
Aaron Burdick 2011-10-9
Hi Walter. Thanks for your help on this. I switched to plotyy function and reprogrammed based on this. But I am still getting the same misalignment in Y axes as I was getting before. Here is the code:
% Create figure
figure1 = figure('XVisual','','Color',[1 1 1]);
% Create difpercent vector
difpercent = (difinput./basinput).*100;
% plotyy graph
[AX,H1,H2] = plotyy(basinput,bas_hpa,difpercent,dif_hpa,@semilogx,@plot)
set(AX(1),'XColor',[0 0 0],'YColor',[0 0 0],'Parent',figure1,...
'YTickLabel',{'200','400','600','800','1000'},...
'YTick',[200 400 600 800 1000],...
'YMinorTick','on',...
'YDir','reverse',...
'XMinorTick','on',...
'Position',[0.13 0.112403846153846 0.710158478605388 0.793461538461539],...
'FontSize',16,...
'FontName','Times');
set(H1,'Color',[0 0 0],'linewidth',2)
axis tight;
legend([,units,],'%','Location','Best')
% Create ylabel
ylabel('Pressure (hPa)','FontWeight','bold','FontSize',18,...
'FontName','Times');
% Create xlabel
xlabel([,xaxistitle,],'FontWeight','bold','FontSize',18,...
'FontName','Times');
set(AX(2),'XAxisLocation','top',...
'YAxisLocation','right',...
'YTick',[200 400 600 800 1000],...
'YTickLabel',{'11.8','7.18','4.20','1.95',''},...
'YMinorTick','off',...
'XMinorTick','on',...
'YDir','reverse',...
'FontSize',16,...
'FontName','Times',...
'Position',[0.13 0.112403846153846 0.710158478605388 0.793461538461539],...
'Color','none',...
'XColor','k','YColor','k');
set(get(AX(2),'Ylabel'),'String','Altitude (km)','FontWeight','bold',...
'FontSize',18,...
'FontName','Times');
set(get(AX(2),'Xlabel'),'String',[,x2axistitle,],'FontWeight','bold',...
'FontSize',18,...
'FontName','Times');
set(H2,'Color',[0 0 0],'linewidth',2,'linestyle',':')
% Set output size
set(gcf, 'units', 'pixels');
set(gcf, 'position', [200 150 650 550]);
Any idea why the Y axes would not be lining up? They are the same values, just labeled differently for the right Y axes (matching up km to pressure).
Thank you!
Aaron

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