Hello, Is there a simple way/function to constrain the minimum and maximum value of an output from an assignment? if I have z <- x +y but I want z to always be between 1 and 5, such that z=5 if (x+y >= 5) and z=1 if (x+y <= 1). I know it sounds simple, I can do it with "if" statements but just wondered if there is a simpler way? Thanks a bunch, J ---------------------- Jim Maas University of East Anglia
this works x=1; y=-100; z = min(5, max(1, x+y)); z On 25 Oct 2011, at 1:46 PM, Jim Maas wrote:> Hello, > > Is there a simple way/function to constrain the minimum and maximum value of an output from an assignment? > > if I have > > z <- x +y > > but I want z to always be between 1 and 5, such that z=5 if (x+y >= 5) and z=1 if (x+y <= 1). > > I know it sounds simple, I can do it with "if" statements but just wondered if there is a simpler way? > > Thanks a bunch, > > J > > ---------------------- > > Jim Maas > University of East Anglia > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.
Hi There, I have a similar problem. I have a function that i want to maximize. lets say: (x-2)^2+(y-4)^2 and i want to constraint that maximization to x+y<=5 I can program that constraints in R. Do you have any suggestion? Regards -- View this message in context: http://r.789695.n4.nabble.com/constrain-min-and-max-of-output-tp3936635p3936688.html Sent from the R help mailing list archive at Nabble.com.
On 25/10/2011 9:03 AM, Timothy Bates wrote:> this works > > x=1; y=-100; > z = min(5, max(1, x+y)); > zBut it only works for scalar x and y. The vector version would use pmin() and pmax(). Duncan Murdoch> On 25 Oct 2011, at 1:46 PM, Jim Maas wrote: > > > Hello, > > > > Is there a simple way/function to constrain the minimum and maximum value of an output from an assignment? > > > > if I have > > > > z<- x +y > > > > but I want z to always be between 1 and 5, such that z=5 if (x+y>= 5) and z=1 if (x+y<= 1). > > > > I know it sounds simple, I can do it with "if" statements but just wondered if there is a simpler way? > > > > Thanks a bunch, > > > > J > > > > ---------------------- > > > > Jim Maas > > University of East Anglia > > > > ______________________________________________ > > R-help at r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.
That is really quite clever! -----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Timothy Bates Sent: Tuesday, October 25, 2011 6:03 AM To: Jim Maas Cc: r-help at r-project.org Subject: Re: [R] constrain min and max of output this works x=1; y=-100; z = min(5, max(1, x+y)); z On 25 Oct 2011, at 1:46 PM, Jim Maas wrote:> Hello, > > Is there a simple way/function to constrain the minimum and maximum value of an output from an assignment? > > if I have > > z <- x +y > > but I want z to always be between 1 and 5, such that z=5 if (x+y >= 5) and z=1 if (x+y <= 1). > > I know it sounds simple, I can do it with "if" statements but just wondered if there is a simpler way? > > Thanks a bunch, > > J > > ---------------------- > > Jim Maas > University of East Anglia > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.