#1

hi everyone, i m trying to run this function after importing shapefiles : gwr.point1<-ggplot(LondonWards, aes(x=x,y=y))+geom_point(aes(colour=LondonWards$coefjobindex))+scale_colour_gradient2(low ="red", mid = "white", high = "blue", midpoint = 0, space = "rgb", na.value = "grey50", guide = "colourbar", guide_legend(title="Coefs"))gwr.point1+geom_path(data=boroughoutline,aes(long, lat, group=id), colour="grey")+coord_equal()
the message that i recive is: Erreur : unexpected symbol in "plot(LondonWards, aes(x=x,y=y))+geom_point(aes(colour=LondonWards$coefjobindex))+scale_colour_gradient2(low ="red", mid = "white", high = "blue", midpoint = 0, space = "rgb", na.value = "grey5".
What can i do to fix this problem?
thank you for your help

#2

I invented some data for your ggplot code and it seems to work fine. Does the following work for you?

library(ggplot2)
LondonWards <- data.frame(x = 1:20, y = 1:20, coefjobindex = sample(1:20))
gwr.point1 <- ggplot(LondonWards, aes(x=x,y=y))+
  geom_point(aes(colour=LondonWards$coefjobindex))+
  scale_colour_gradient2(low ="red", mid = "white", high = "blue", 
                         midpoint = 0, space = "rgb", na.value = "grey50", 
                         guide = "colourbar", guide_legend(title="Coefs"))
#> Warning: Non Lab interpolation is deprecated
boroughoutline <- data.frame(long = c(2,7,7,2, 2, 11,17,17,11,11),
                             lat = c(2,2, 12,12,2, 15, 15, 18, 18,15),
                             id = c(1,1,1,1,1,2,2,2,2,2))

gwr.point1+geom_path(data=boroughoutline,aes(long, lat, group=id), colour="grey")+
  coord_equal()

Created on 2020-01-02 by the reprex package (v0.3.0)

#3

dear FJCC,
I try all the commands but long = c(2,7,7,2, 2, 11,17,17,11,11) mean the rows or clums or what exactly ?
thank you

#4

That line is just part of defining the boroughoutline data frame. Execute all of

boroughoutline <- data.frame(long = c(2,7,7,2, 2, 11,17,17,11,11),
                             lat = c(2,2, 12,12,2, 15, 15, 18, 18,15),
                             id = c(1,1,1,1,1,2,2,2,2,2))

at one time and you will get a data frame that defines the rectangles drawn by geom_path in the subsequent ggplot command.

#5

but i have 268 coordinates, what can i do ?

#6

The code I posted was just a very simple example showing that your ggplot call works with the data I invented. If my example also works for you, then the problem is probably in your data. You have not shown anything about your data, so I cannot say anything about that at the moment.

#7

i want to give data files but i don't know how i import here

#8

The best approach is to make a Reproducible Example. I will post a link to a tutorial but you can also search for that term or for the abbreviation Reprex and find a lot of advice. The key is to make a data set that is not larger than needed to show the problem.

#9

The error message ends in
na.value="grey5"
but in your code you have
na.value="grey50"
Are you sure the zero in "grey50" is actually a zero and not some other funky character?

#10

thanks a lot everyone, i solved my problem

#11

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Thanks

#12

it is easy, you juste run the command for the shapefiles that contain polygons like following:
boroughs <- readOGR("C:/Users/asus/Desktop/R/TUN_adm2.shp")
and the other commands will give you the right results.
Amani

#13

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