如何在Matlab中找到图的x截距 [英] How to find the x-intercept of a plot in Matlab

问题描述

我知道这个问题肯定有一个非常简单的答案，但是我似乎找不到. (猜猜我可能在搜索错误的术语.)

I know there must be a really simple answer to this question, but I just can't seem to find it. (Guess I'm probably Googling the wrong terms.)

我正在使用 plot(x，data)函数在Matlab中绘制一些数据.

I am plotting some data in Matlab using the plot(x, data) function.

我想找到直线的x轴截距，即y = 0的点.

I want to find the x-intercept(s) of the line, i.e. the point(s) where y = 0.

在某些情况下， data 向量可能实际上不包含等于零的值，因此，这不仅仅是在 data <中查找元素索引的问题. /em>等于零，然后在 x 向量中找到相应的元素.

In some cases, it may be that the data vector doesn't actually contain values equal to zero, so it's not just a matter of finding the indexes of the elements in data which are equal to zero, and then finding the corresponding elements in the x vector.

就像我说的那样，这是一个非常简单的问题，我认为Matlab中已经有一些内置函数...

Like I said, it's a really simple problem and I'd think there's already some in-built function in Matlab...

谢谢您的帮助.

推荐答案

如果要查找X截距作为围绕X轴的2个最接近点之间的插值，则可以使用INTERP1函数:

If you want to find X-intercept as interpolate between 2 closest points around X axes you can use INTERP1 function:

x0 = interp1(y,x,0);

如果x和y单调增加/减少，它将起作用.

It will work if x and y are monotonically increasing/decreasing.

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