On Mar 25, 2009, at 2:22 PM, David Winsemius wrote:
On Mar 25, 2009, at 8:37 AM, Greg wrote:
Forgive me for not being more clear.
Would you expect that one y
value returns more than one x? I don't
No, I don't either. I want to know the value of that x, however.
For
example:
x <- c(
On Mar 25, 2009, at 8:37 AM, Greg wrote:
Forgive me for not being more clear.
Would you expect that one y
value returns more than one x? I don't
No, I don't either. I want to know the value of that x, however. For
example:
x <- c(2.743, 3.019, 3.329, 3.583, 4.017)
y <- c(0.000, 0.025, 0.
Forgive me for not being more clear.
> Would you expect that one y
> value returns more than one x? I don't
No, I don't either. I want to know the value of that x, however. For
example:
x <- c(2.743, 3.019, 3.329, 3.583, 4.017)
y <- c(0.000, 0.025, 0.025, 0.158, 1.000)
I would like to know th
Greg,
it seems an obvious behavior to me
y=c(2,2,2,3,3,3,1)
x=1:length(y)
plot(x,y)
lines(x,approxfun(x,y)(x)) # for every x it exists one only value of y
plot(y,x)
lines(sort(y),approxfun(y,x)(sort(y))) # for some y it exists more
than one value of x!
approxfun return a function. By definition
Is it possible to interpolate a value for x with knowledge of y?
For example, approx(x, y, xout) will give me y's given a set of x's,
which is opposite to what I'm after. I've tried switching x and y,
e.g., approx(y, x, xout), but in a real data set it is possible to
have more than one y for a gi
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