[R] Finding coordinates for maximum of a function

[derek]

Hello R,

I have data in txt file of n columns like this:
x  y1 .....yn
1  100
2  50
3  10
4  200
5  20


I need to find coordinates for each maxima e.g.: [x,y1],[x,y2]...[x,yn]

a=read.table()
attach(a)
b=y1<-x
max(b) returns only value of y but no corresponding x value



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