Datacursor to show Z axis String Info with Precise X axis information

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Min 2024-3-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2097421-datacursor-to-show-z-axis-string-info-with-precise-x-axis-information

编辑： Voss 2024-3-26

Hi, I am trying to show the Z axis string info when I click the cursor on the plot (3D).

But the problem is that, when I have just a normal (default) datacursor function, it shows the Z-axis string info as it is shown below.

But I had to change the function to show the precise time information which then caused the Z data to hide the string info and shows the actual value info.

formattedValue = [valueFormat num2str(value,10) removeValueFormat];

Now the function shows that the precise time information but the Z value doesn't show the string info.

I tried to change the Z information within the data cursor to show the string info

% If there is a z value, display it:
if length(pos) > 2
    valueFormat = ' \color[rgb]{0 0.6 1}\bf';
    removeValueFormat = '\color[rgb]{.25 .25 .25}\rm';
    tickLabel = event_obj.Target.Parent.ZTickLabel(pos(3));
    output_txt{end+1} = ['Z', valueFormat tickLabel{3} removeValueFormat];
    % output_txt{end+1} = ['Z',formatValue(pos(3),event_obj)];
end

It shows that this is invalid.

Anyone has any idea what I should be doing?

Thanks!

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Answer 1

Voss 2024-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/2097421-datacursor-to-show-z-axis-string-info-with-precise-x-axis-information#answer_1429246

在 MATLAB Online 中打开

tickLabel is a scalar cell array, so don't index it with 3. Use 1 instead:

output_txt{end+1} = ['Z', valueFormat tickLabel{1} removeValueFormat];

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Voss 2024-3-22

在 MATLAB Online 中打开

No problem. Thank you for the files.

Unfortunately, I don't have the Vehicle Network Toolbox, so I am unable to run the .mlapp file.

However, I did reproduce the problem using a simple plot

figure
plot3(1:10,1:10,1:10)
dcm_obj = datacursormode(gcf());
set(dcm_obj, 'UpdateFcn', @displayHighPrecision)

When that plot is created, the z-axis has 6 tick labels {'0','2','4','6','8','10'}. Now, displayHighPrecision wants to access the zticklabel at index pos(3), which is the z-coordinate. For instance if pos(3) is 7, you'll get an error trying to access the 7th zticklabel because there are only 6. Even if there is no error thrown, the logic is incorrect because the zticklabels don't match with the z values, i.e., not every point from z=1 to 10 has a ztick. This is probably the same problem that's happening in your code.

Is there a reason you want to use the zticklabels instead of just the z value, pos(3)? If so, you need to adjust your code to make sure that there's a tick for each point in the plotted line.

Min 2024-3-26

Sorry that (3) was not intended since I was trying to figure out what was wrong with my code. After awhile, I found the problem!

My data was generated as a category tab not a Zticklabel for some reason.

Thanks for looking into this problem but it was a simple mistake that I wasn't aware of.

Thank you!

Voss 2024-3-26

编辑：Voss 2024-3-26

You're welcome! Glad you got it sorted out.

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Datacursor to show Z axis String Info with Precise X axis information

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