Finding the peak position of a plot?

3 次查看（过去 30 天）

Niranjan 2011-2-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/964-finding-the-peak-position-of-a-plot

Hi,can anyone tell me how to find the peak of a plot . I have the code plot(sum(fill>0)); Now how to find the peak value of the plot??

2 个评论
显示无隐藏无

Sean de Wolski 2011-2-7

Don't overwrite the stock

fill

function

Andrew Newell 2011-2-7

In other words, choose a different name for your variable FILL because it is the name of a MATLAB plot function.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Andrew Newell 2011-2-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/964-finding-the-peak-position-of-a-plot#answer_1375

在 MATLAB Online 中打开

If sum(fill>0) is the thing you want the maximum of, you could use

[C,I] = max(sum(fill>0));

The C give the maximum value (or values, if you have a matrix) and I the position(s).

In your original problem statement, you asked to find the "peak value" of the plot, but now you are asking to find the "maximum position". The peak _value_ would be the maximum height, whereas the maximum position would be the x location at which it occurs.

Andrew's answer covers both possibilities: his C would be the height and his I would be the x value.

If all you need is the height, then you can simplify his code by a tiny bit,

C = max(sum(fill>0));

This really is about as fast as you are going to be able to get without resorting to mex, and since you only have about 120 columns I'm not sure you would be able to do any faster in mex (though you could do a mex version that used less memory.)

Niranjan 2011-2-11