识别曲线中的点 [英] Identifying points in a curve
本文介绍了识别曲线中的点的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我觉得这是一个简单的问题...
I feel like this is an easy question...
如何识别图形中的坐标?我绘制了一些数据,使用unireg(uniReg程序包)绘制样条曲线,并希望从某个点提取数据.
How do you identify coordinates in a figure? I plotted some data, used unireg (the uniReg package) to make a spline curve, and want to pull out the data from a point.
library(uniReg)
P0mM <- read.table(text="
Time FeuM
0.04 138.8181818
7 1258.636364
14 1320.545455
21 2110.37037
28 13730.37037
35 1550.909091",header=TRUE)
z=seq(min(P0mM$Time),max(P0mM$Time),length=201)
uf=with(P0mM,unireg(Time,FeuM,g=5,sigma=1))
plot(FeuM~Time,P0mM,ylim=c(0,16000),ylab="Fe2+ uM", xlab="Time", main="0mM P")
lines(z,uf$unimod.func(z))
我能够找到曲线的y最大值(14444)
I was able to find the max y value of the curve (which is 14444)
max((uf$unimod.func(z)))
我想确定这在x轴上发生的位置. (应该是30岁左右,但我想确切地说).
I want to identify where on the x axis this happens. (Should be around 30, but I want to be exact).
您如何做到的?
谢谢!
推荐答案
似乎类似于optimise
或optimize
的情况(取决于您与英国或美国英语的相似程度):
Seems like a case for optimise
or optimize
(depending on your affinity with British or American English):
optimise(uf$unimod.func, maximum=TRUE, interval=range(P0mM$Time))
#$maximum
#[1] 29.27168
#
#$objective
# [,1]
#[1,] 14444.85
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