find a value between two points

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dsq dq 2021-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/1453654-find-a-value-between-two-points

评论： Star Strider 2021-9-15

采纳的回答： Star Strider

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Hey everyone,

I have the following case : (picture linked to the tocpic).

Let's suppose that i have two points with their value on y-axis equals to -20.5 and -19.5. I also know their value on x-axis (let's suppose 10^9 and 2*10^9). I don't have more points between them.

I would like to know : How can I find the value on X-axis of the point that have the value on y-axis equal to -20.

If it's not understandable, I hope the picture linked to it will be helpful !

Thanks you very much !

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Mathieu NOE 2021-9-15

hi

seems you want to have this intermediate point from a curve that passes through the 2 points. have you tried to create this curve or a approximation (fit) of it ? then you can pick anypoint from this curve.

otherwise you could do simple interpolation, but with only two input points this would be limited to a simple linear interpolation , which is not what your picture says.

dsq dq 2021-9-15

编辑：dsq dq 2021-9-15

Hi,

This curve is already created I have like ~ 8000 points, so I cannot create it. I looked for the interpolation function but I didn't get how this could help me because I would like to have the exact value for -20 ...

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