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66 lines
793 B
R
66 lines
793 B
R
x <- c (1,3,2,5)
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x
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y = c(5,4,7)
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length(x)
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length(y)
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ls()
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x+y
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x = matrix ( data = c (1,2,3,4), nrow=2, ncol=2)
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matrix ( c(1,2,3,4),2,2,byrow=TRUE)
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sqrt( x )
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x = rnorm(50)
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y = x + rnorm(50,mean=50,sd=.1)
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cor(x,y)
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set.seed(1303)
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rnorm(50)
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set.seed(3)
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y = rnorm(100)
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mean(y)
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var(y)
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sqrt(var(y))
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sd (y)
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x = rnorm(100)
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y = rnorm(100)
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plot(x,y)
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pdf("Figure.pdf")
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plot(x,y,col="green")
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dev.off()
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x = seq (1 ,10)
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x =1:10
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x = seq ( - pi , pi , length =50)
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y=x
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f = outer(x,y,function(x,y) cos(y)/(1+x^2))
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contour(x,y,f)
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contour(x,y,f,nlevels=45,add=T)
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fa=(f-t(f))/2
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contour(x,y,fa,nlevels=15)
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image (x ,y , fa )
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persp (x ,y , fa )
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persp (x ,y , fa , theta =30)
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persp (x ,y , fa , theta =30 , phi =20)
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persp (x ,y , fa , theta =30 , phi =70)
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persp (x ,y , fa , theta =30 , phi =40)
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