Is there a way to select certain point in matlab plot by interpolation?

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yc j 2015-6-3

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https://ww2.mathworks.cn/matlabcentral/answers/222179-is-there-a-way-to-select-certain-point-in-matlab-plot-by-interpolation

评论： yc j 2015-6-15

Hi, I am having a trouble in selecting a point in plot.

For example, I have data file with x = [1 2] and y = [5 10].

After ploting x and y, I want to select the point where x = 1.5. Of course since my data only has 1 and 2 as the x values, the data cursor won't pick up x=1.5.

Is there anyway I can quickly see the y-value when x=1.5?

I have about 500 data files in which I have to do something like above and can't afford to do interpolation everytime...

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Walter Roberson 2015-6-3

How are you doing the "selecting" at the moment?

yc j 2015-6-3

编辑：yc j 2015-6-3

I have this m file which will ask for the data file when i press F5. After selecting the data file, the m file will calculate and plot the data. Here, I press "data cursor" at the top side of the plot, and select the points near the point of interest. For example, I want y-value when x=1.3, but the data cursor will only allow me to select x=1 and x=1.5... I guess this is because whatever the calculations the m file is doing, it gives plot by x= 0.5 increase..

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Answer 1

Walter Roberson 2015-6-3

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When you create the data cursor on screen, right click on it. In the menu that comes up, hover over the first item, Selection Style, and move your mouse to the right of that line to bring up the pop-up menu at the right side. On that popup menu, choose "Mouse Position" instead of "Snap to Vertex".