How do I plot a pch=4 value on the coordinates of this map?

[joelt92]

xcoord and ycoord are just a bunch of random numbers starting from 1-100

plot(xcoord,ycoord,pch=15, col="grey", 
     main="Map of Africa",xlim=c(27,46),
     xlab="Latitude",ylab="Longtitude")

When the above function is run, the output is a condensed scatter plot that resembles a grey map of a region in africa. Please note 46891 are the total number of rows in the dataframe

pvals are pvalues

pvals <- c(rep(0,49681))
slopes <- c(rep(0,49681))

If I run the below code, I receive areas of marked in green red and rest as tan.(Image attached)

for(i in 1:49681){

  if(pvals[i] < 0.01 & slopes[i]>0)points(xcoord[i],ycoord[i],pch=15,col="green",cex=0.4)
  if(pvals[i] < 0.01 & slopes[i]<0)points(xcoord[i],ycoord[i],pch=15,col="red",cex=0.4)
  if(pvals[i] >= 0.01)points(xcoord[i],ycoord[i],pch=15,col="tan",cex=0.4)
}

However,I specifically want to mark coordinates within this colored map
I tried to do this with the below code but it just plots the same image of a colored map without an X. The X is symbol pch=4

for(i in 1:49681){
  if(pvals[i] < 0.01 & slopes[i]>0)points(xcoord[i],ycoord[i],pch=15,col="green",cex=0.4)
  if(pvals[i] < 0.01 & slopes[i]<0)points(xcoord[i],ycoord[i],pch=15,col="red",cex=0.4)
  if(pvals[i] >= 0.01)points(xcoord[i],ycoord[i],pch=15,col="tan",cex=0.4)
  if(pvals[i] == 0.003851973 & slopes[i![map|665x362](upload://ehGEiUGZoLm1BLV6oalvfJ5dQSc.jpeg) ] == 0.1493456)points(xcoord[i],ycoord[i],pch=4,col="black",cex=15)
  if(pvals[i] == 0.3921581 & slopes[i] == -0.04883013)points(xcoord[i],ycoord[i],pch=4,col="black",cex=15)
}

What should I alter in the final code?

[mfherman]

Hi @joelt92, I just wanted to let you know that it’s discouraged in this form to @name mention another user in a post if they are not already participating in the thread. See this FAQ for more details:

FAQ: Should I @name mention other users in my post?

What is @name mentioning? @name mentioning is when you type someone's username with an @ preceding it. Doing this sends a notification to the user. Depending on their settings, it may also send them an email message. For example, with @JacqueHousteauGram in my text, Jacque here will be dynamically notified in community (and via email if he's configured for it). Please don't use this feature excessively In general, it is considered bad form to @name mention someone not otherwise engaged in the conversation. Why should I limit how much I @name mention others? It can be annoying Active people who were being frequently mentioned in topics were first to request that this practice be minimized…

[joelt92]

@mfherman I was not aware of this policy. Thanks for the headsup.