smoothly explore data points on the plot

After reinstalling MATLAB, I noticed a change in the behavior of the margin, rlocus, nyquist function. Previously, when I plotted using margin, rlocus, nyquist the cursor could smoothly explore data points on the plot without any special commands. However, after reinstalling, the cursor now moves in larger steps, and the plot appears to have a lower density. I would like to restore the previous behavior where the plot had higher density and the cursor moved smoothly. How can I achieve this?

[Divyajyoti Nayak]

Hi @기현 남, could you mention which older version of MATLAB you were working with? I tested out these functions with R2024a and R2023a, and the cursor works the same for both. Some sample code would also be helpful.

[기현]

i'm using 20204b, for example,

num=[1];
den=[1 1 1];
sys=tf(num, den);
margin(sys)

In the plot, the frequency values seem to skip directly from 4.78 to 5.59, even though the graph visually shows the intermediate values. However, when hovering the mouse cursor, it skips over those values.

Answer 1

[Sumukh]

Hi @기현 남,

I am assuming that you are referring to the behaviour of data tips on the plot. I am able to reproduce the issue in MATLAB R2024b and it is true that when clicked on the plot, the nearest data tip gets pinned instead of the selected data point.

This is an expected behaviour of data tips and is related to the "SnapToDataVertex" property as specified in the following documentation for datatip:

https://www.mathworks.com/help/matlab/ref/matlab.graphics.datatip.datatip.html#mw_550d56ae-593f-4cfa-a296-8c176a353ea1

This property is enabled by default and it allows the user to display the nearest data tip to the selected data point.

Kindly refer to the following steps to disable this property within the plot itself:

1. After the creation of the plot using either of the commands specified, click on a data point of the plot to create a random data tip.
2. Right-click on the data tip > "Selection Style" > Select "Mouse Position" option instead of "Snap to Nearest Data Vertex" selected by default.
3. Now it is possible to create a data tip for any data point on the plot within the current figure opened.

I hope this resolves your issue.

[기현]

thank you very much it works well