Hello,
See inline.
Em 22-05-2014 13:35, message escreveu:
On 2014-05-22 11:00, Berend Hasselman wrote:
uniroot(function(x) 5*x - 55, c(0, 10))
Error in uniroot(function(x) 5 * x - 55, c(0, 10)) :
f() values at end points not of opposite sign
I don’t believe this.
The error message says it all.
5*0-55 ==> -55
5*10-55 ==> -5
The error states "opposite sign", which suggests to a rudimentary novice
that end points (0 and 10, or 0 and 20) must give results of the
function such that one value is negative, another value is positive. Or
is this interpretation wrong?
No, it's not. This is basic Math.
See the Details section of the uniroot documentation.
The documentation states that the upper end point (in this example 10,
or 20) must be strictly larger than the lower point (0). What is being
mis-understood please?
I believe that Berend was trying to have you read that "The function
values at the endpoints must be of opposite signs (or zero), for
extendInt="no", the default."
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