How to make a for with more than one else if in R?-CodePudding

I want to associate points in these coordinates and associate them with the correspondent number. However every time I tried to run it I got this: the condition has length > 1

for (i in dados) {
    if (dados[dados$latitude>="55.84" & dados$latitude<= "55.95" & dados$longitude>="-3.444" & dados$longitude<="-3.198", ]){
      dados$neighbourhood <- 1
    } else if (dados[dados$latitude>="55.84" & dados$latitude<= "55.95" & dados$longitude>="-3.198" & dados$longitude<="-3.058", ]){
      dados$neighbourhood <- 2
    } else if (dados[dados$latitude>="55.95" & dados$latitude<="56.01" & dados$longitude>="-3.444" & dados$longitude<="-3.198", ]){
      dados$neighbourhood <- 3
    } else if (dados[dados$latitude>="55.95" & dados$latitude<="56.01" & dados$longitude>="-3.189" & dados$longitude<="-3.058", ]){
      dados$neigbourhod <- 4
    }
   }

Your help would be much appreciated thanks in advance.

CodePudding user response：

Often, you need to execute some statements only when some condition is met. You can use following conditional statements in your code to do this.

if Statement: use it to execute a block of code, if a specified condition is true else Statement: use it to execute a block of code, if the same condition is false else if Statement: use it to specify a new condition to test, if the first condition is false ifelse() Function: use it when to check the condition for every element of a vector

CodePudding user response：

Here is a vectorized way. Use the fact that binary numbers are written with 0/1 times powers of two. And add 1 to have the results be one-based.

i2 <- dados$latitude >= 55.95 & dados$latitude<= 56.01
i1 <- dados$longitude >= -3.198 & dados$longitude <= -3.058
dados$neigbourhod <- 1   i1   i2*2