When I replot some of the axes in my figure the previous tick labels don't delete and the new tick labels overlap.

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I have a figure window with 6 axes and a control panel. The axes can be re-plotted using different coordinate systems, which moves the ticks and grids on the plot, creating new tick labels. I cannot get the previous labels to delete before the new labels are added, making the mess shown in the image. I've tried "clf()", but that clears almost everything off of my figure, which is not useful. And putting "figure" before the plot commands opens a new figure window which is also not useful. Multiple figure windows makes the use of the program cumbersome. So far the best I've been able to do is to keep the first set of tick labels without being over written with new labels by putting
set(gca,'xTickLabel','','yTickLabel','') % delete the x-tick and y-tick labels
before or after the plot command (seems to do the same thing regardless of location), but then the tick labels are not lined up with the ticks and are meaningless. Here is the code and image of the plot:
if true
%First plotted with this code:
eclip_lon_overlay = axes('Units','pixels','Position',[1077 547 450 450],'Xdir','reverse');
eclip_lon_overlay = gca;
%Plot initial background radiants
plot(orbit_data(o_index,14),orbit_data(o_index,13),'.k','markersize',markersize)
set(gca,'Xdir','reverse')
hold on
%Add Titles and labels
eclip_lon_overlay.Title.String = 'D Pass Overlay';
eclip_lon_overlay.FontSize = 10;
eclip_lon_overlay.Title.FontSize = 13;
xlabel('\bfEcliptic Longitude','FontSize',12)
ylabel('\bfEcliptic Latitude','FontSize',12)
%Set Plot size
axis([shower_data(s_index,15) - plot_frame_offset,shower_data(s_index,15) + plot_frame_offset,...
shower_data(s_index,16) - plot_frame_offset,shower_data(s_index,16) + plot_frame_offset])
%Plot center cross marker
plot(shower_data(s_index,15),shower_data(s_index,16),'+r','markersize',(markersize + 12))
grid on
hold off
if true
%Replotted with this code:
gca = axes('Units','pixels','Position',pos1,'Xdir','reverse');
plot(orbit_data(o_index,o_x_data),orbit_data(o_index,o_y_data),'.k','markersize',markersize)
set(gca,'Xdir','reverse')
hold on
%Set Plot size
axis([x - plot_frame_offset - 0,x + plot_frame_offset + 0,y - plot_frame_offset - 0,y + plot_frame_offset + 0])
%Plot D Pass overlays
plot(orbit_data(o_index(d_pass),o_x_data),orbit_data(o_index(d_pass),o_y_data),'Marker','.','Color',d_color,...
'MarkerSize',(markersize + 4),'LineStyle','none')
%Plot center cross marker
plot(x,y,'+r','markersize',(markersize + 12))
grid on
hold off
end
end

Accepted Answer

Cam Salzberger
Cam Salzberger on 16 May 2017
Hello David,
I believe this is occurring because you are creating a new set of axes when you do:
gca = axes('Units','pixels','Position',pos1,'Xdir','reverse');
"axes" is the function to create a new axes. So this will create a new axes in the position specified by "pos1". I'm not sure where "pos1" is defined, but I can only assume it's the same as the old axes. You are seeing both the old and new tick labels because the old axes is still behind there.
Also, please never assign things to variables that have the same name as built-in functions. "gca" is a built-in function to get the current axes. When you do "gca = axes(...)", it assigns "gca" as a variable, which will always be accessed now, making the "gca" function unusable. Really, really recommend against doing that. It also makes code far more confusing.
As "MathReallyWorks" said in your last question, you could use "clf" to clear the figure before making a new axes. However, that's probably overkill.
If you are looking to keep your old data, you can just keep "hold on" and just plot to the old axes. If you don't want your old data, you could call "cla" on the old axes, or do "hold off", and then call plot again.
If you'd like an advanced maneuver, I'd recommend retaining your original handle to the line object output by the first "plot" call. This would allow you to simply replace the data in the line properties, rather than clearing the axes and replotting. This is faster by a small amount. For example:
figure
axes
hStars = plot(1:10,1:10,'.k');
% ... do stuff ...
newX = 1:2:20;
newY = 11:2:30;
hStars.XData = newX;
hStars.YData = newY;
-Cam
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