How to plot function with parameter in R

Question

I would like to plot a function several times, each time changing a parameter (a constant) in the function. How can i do this?

fun1 <- function(x, b) abs(x^2 - b^2)

plot(fun1(b=0.1),-1, 1)

plot(fun1(b=0.2),-1, 1, add=TRUE)

do you want to save the result? or just look at it? so you want to vary b while x stays fixated? — grrgrrbla
– grrgrrbla, Commented Jun 10, 2015 at 16:34

agstudy · Accepted Answer · 2015-06-10 16:48:50Z

2

Same approach just generalized in a for-loop:

  for (b in c(0.1,0.2))curve(abs(x^2 - b^2),add=TRUE,col='red')

answered Jun 10, 2015 at 16:48

agstudy

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3 Comments

grrgrrbla Over a year ago

funny I just now wanted to add the same thing using lapply

agstudy Over a year ago

@grrgrrbla do it:) but maybe you should use invisible(lapply(...))

grrgrrbla Over a year ago

good tip with the invisible, but I wont do it, its basically the same thing, I would have done: invisible(lapply(seq(0.1,0.2,0.1), function(b) curve(abs(x^2 - b^2), -1, 1, add = TRUE)))

grrgrrbla · Accepted Answer · 2015-06-10 16:41:47Z

1

try this:

curve(abs(x^2 - 0.1^2), -1, 1)
curve(abs(x^2 - 0.2^2), -1, 1, add = TRUE)

answered Jun 10, 2015 at 16:41

grrgrrbla

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