Unable to reverse the order of numbers on the Y-axis

plot(1,a)
        bar3c(flipud(dam_tot(:,:,a)))
        colorbar;
        colormap(jet);
        caxis([0 0.1]);
        set(gca,'XTick',[1:1:11]);        
        set(gca,'XTickLabels',round((minSpeedRef:speed_range/(resolution-1):maxSpeedRef)));
        xtickangle(-45)
        set(gca,'YTick',[1:1:11]);       
        ax.YDir = 'reverse';
        set(gca,'YTickLabels',round(flipud((minTorqueRef:torque_range/(resolution-1):maxTorqueRef))));       
        ytickangle(45)
        xlabel('Speed');
        ylabel('Torque');
        title(strcat(fname{a},' Damage per Load Case'),'fontsize',14);
        set(gcf,'units','inches','position',[0 .5 7 5.5])
        set(gca,'FontSize',12)

[Benjamin Kraus]

I can't run your code without knowing more about a and dam_tot (and other variables). Setting YDir to reverse should flip the order of the numbers on the Y-axis. Can you post a screenshot of what you are seeing, and why it doesn't match what you are trying to get?

Answer 1

[Ameer Hamza]

Your line

ax.YDir = 'reverse';

is not actually doing what you think it is doing. You should add the following line before it.

ax = gca;
ax.YDir = 'reverse';

or use set()

set(gca, 'YDir', 'reverse');

Your code is not giving an error because it is a valid MATLAB syntax. It creates a new struct object with field YDir.

[Benjamin Kraus]

Good catch Ameer.

[Chris Park]

I tried what you recommended but it did not work. I have attached the graph I am getting. I would like to flip the numbers on the y axis (torque).

[Ameer Hamza]

Can you show the output of

ax.YDir

Are you sure that your graph has just one axes. Can you attach the fig file? It might be helpful in pointing out the problem.

[Chris Park]

Yes. Here is the updated code and the resulting fig. It did not change anything as far as I can tell. I would like to reverse the order of the y axis numbers. (torque)

[Ameer Hamza]

You didn't add any code. Also, it is better to attach the .fig file generated by MATLAB. Images are not very helpful in checking the internal properties of figure object.

[Chris Park]

My apologies.

   plot(1,a)

          bar3c(flipud(dam_tot_col_by_speed(:,:,a)))
          colorbar;
          colormap(jet);
          caxis([0 0.1]);
          set(gca,'XTick',[1:1:11]);
          set(gca,'XTickLabels',round((minSpeedRef:speed_range/(resolution-1):maxSpeedRef)));
          xtickangle(-45)

          set(gca,'YTick',[1:1:11]);       
          ax = gca ; 
          ax.YDir = 'reverse';
          set(gca,'YTickLabels',round(flipud((minTorqueRef:torque_range/(resolution-1):maxTorqueRef))));
          ytickangle(45)
          xlabel('Engine Speed (RPM)');
          ylabel('Engine Torque (Nm)');
          title(strcat(fname{a},' Damage per Load Case'),'fontsize',14);
          set(gcf,'units','inches','position',[0 .5 7 5.5])
          set(gca,'FontSize',12)

[Ameer Hamza]

Your y-axis in the fig file is already reversed. After opening your fig file I ran following code

ax = gca;
ax.YDir = 'normal'

and the result is

Also if you want to keep the graph same but only reverse labels then use

ax = gca;
ax.YTickLabel = flipud(ax.YTickLabel)

and you will get this

Are you expecting something different?

[Chris Park]

Got it! Thank you!

[Ameer Hamza]

You are welcome.

Answer 2

[Benjamin Kraus]

Without being able to run your code this is just speculation, but it looks like you may be double-flipping your Y-axis tick labels. Two lines of code stick out:

ax.YDir = 'reverse';
set(gca,'YTickLabels',round(flipud((minTorqueRef:torque_range/(resolution-1):maxTorqueRef))));

You have flipud in the call to set the YTickLabels, which may mean you are assigning the wrong tick labels to each tick (essentially assigning them in reverse order). Try commenting out the second line (the one that is setting YTickLabels) and see if it looks like the ticks are in the correct order. If so, remove the flipud.

[Chris Park]

I tried comment out the line you recommended but it did not work. I have attached an image of the graph I am getting. I would like to reverse the order of the y-axis numbers (torque)