I got it sorted thank you. As you point out, the original code works fine (there was a type mismatch with it).
On 1 Oct 2015, at 12:00, PIKAL Petr <petr.pi...@precheza.cz> wrote: Hi Are agents and agent different objects? Or it is a typo? Better would be to provide some real or fake data by dput or at least result of str(agent) and str(agents) Actually your code shall work in case agent and agents have same length and expected order. agents[which(agent$membership == 1)] <- agents[which(agent$membership == 1)] + 1 For less typing you can do: sel <- which(agent$membership == 1) agents[sel] <- agents[sel] + 1 The code can be different if agent or agents are objects like matrix or array. Actually from the code xxx$yyy I presume it is data frame or list. Cheers Petr > -----Original Message----- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Thomas > Chesney > Sent: Thursday, October 01, 2015 12:04 PM > To: r-help@r-project.org > Subject: [R] Increment certain values in a vector > > How can I manipulate values of only certain entries in a vector, based > on what the existing values are? > > So for instance if I want to add one to each of the following values, > or multiply them by a specific factor: > > agents[which(agent$membership == 1)] > > how would I do this please? > > If there was just one value to manipulate I'd just do this: > > value <- value + 1 > > and this would let me set the values: > > agents[which(agent$membership == 1)] <- 100 > > but how to essentially achieve this: > > agents[which(agent$membership == 1)] <- agents[which(agent$membership > == 1)] + 1 > > Thank you! > > > > This message and any attachment are intended solely for the addressee > and may contain confidential information. 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