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+ signs appearing in console in R


+ signs appearing in console in R

By : Irmatek
Date : November 21 2020, 07:31 AM
To fix the issue you can do The + symbols are only a way to show that the current statement is conitnuation of the previous lines's statement. That's perfectly OK. There are a couple of other problems with your program which are stopping it from producing your intended result. If I have in fact, understood what you are trying to do, I have added a possible solution at the end. First, let me suggest the edits and the reason for them:
& should have been used instead of &&. & is the vectorized operator. So, upperright = a[,2] > 0 & a[,3] > 0 instead of upperright = a[,2] > 0 && a[,3] > 0. You are passing a value to the function so its definition should include the parameter calculation <- function (a) instead of calculation <- function (). upperright, upperleft, ... are vectors and you should check individual elements instead of the whole vector if (upperright[i]) instead of if (upperright). Problem with sum((a[i,1]-a[i-1,1])) at i==1, i-1 equals 0. If you are only counting, incrementing the count by 1 should be sufficient. The objects upperrightquadrant, upperleftquadrant, ... are in your function environment only. So, no need for <<-.
code :
set.seed(20)
x = matrix(rnorm(10,3,4),10,1)
y = matrix (rnorm(10,3,4),10,1)
time = matrix (1:10,10,1)
a = cbind (time,x,y)

colnames(a) = c("time","x","y")

upperright =  a[,2] > 0 & a[,3] > 0 
upperleft =   a[,2] < 0 & a[,3] > 0
lowerright =  a[,2] > 0 & a[,3] < 0
lowerleft =   a[,2] < 0 & a[,3] < 0

calculation <- function (a) {
  upperrightquadrant = 0
  upperleftquadrant = 0
  lowerrightquadrant = 0
  lowerleftquadrant = 0
  for (i in c(1:nrow(a))){
    if (upperright[i]) upperrightquadrant <- upperrightquadrant + 1
    if (upperleft[i]) upperleftquadrant <- upperleftquadrant + 1
    if (lowerright[i]) lowerrightquadrant <- lowerrightquadrant + 1
    if (lowerleft[i]) lowerleftquadrant <- lowerleftquadrant + 1
  }

  list(upperrightquadrant = upperrightquadrant, upperleftquadrant = upperleftquadrant,
       lowerrightquadrant = lowerrightquadrant, lowerleftquadrant = lowerleftquadrant)
}
output = calculation(a)

print(a)        # input
print(output)   # output
  for (i in c(1:nrow(a))){
    if(i>1){
      if (upperright[i]) upperrightquadrant <- upperrightquadrant + a[i, 1] - a[i-1, 1]
      if (upperleft[i]) upperleftquadrant <- upperleftquadrant + a[i, 1] - a[i-1, 1]
      if (lowerright[i]) lowerrightquadrant <- lowerrightquadrant + a[i, 1] - a[i-1, 1]
      if (lowerleft[i]) lowerleftquadrant <- lowerleftquadrant + a[i, 1] - a[i-1, 1]
    } else {
      if (upperright[i]) upperrightquadrant <- upperrightquadrant + a[i, 1]
      if (upperleft[i]) upperleftquadrant <- upperleftquadrant + a[i, 1]
      if (lowerright[i]) lowerrightquadrant <- lowerrightquadrant + a[i, 1]
      if (lowerleft[i]) lowerleftquadrant <- lowerleftquadrant + a[i, 1]
    }
  }


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