Adding Two-Headed Arrow in map legend

On Apr 9, 2016, at 1:27 PM, David Winsemius <dwinsemius at comcast.net> wrote:

On Apr 9, 2016, at 11:18 AM, David Winsemius <dwinsemius at comcast.net> wrote:

On Apr 9, 2016, at 10:46 AM, Miluji Sb <milujisb at gmail.com> wrote:

Dear David,

Thank you for your answer. Sorry for the embarrassing mistake. However, even with when I generate a map for the whole world using:

eps <- mapCountryData(n, nameColumnToPlot="eps_score", mapTitle="EPS Score",colourPalette=colourPalette, 
                    catMethod="fixedWidth", missingCountryCol = "white", addLegend=FALSE)

And then use:

do.call(addMapLegend, c(eps, legendLabels="none", arrows(-100,-140,100,-140,code=3)))

I do get an arrow using same version of R and OSX. See attached. (I think that png images will be accepted by the mailserver.)

Nope I was wrong, but the copy to Milugi did arrive.

Here's a (somewhat larger) pdf:

-- 
David

-- 
David.

Only a legend with the colours is generated, no arrows. My session info is below. Thanks again!

R version 3.2.4 (2016-03-10)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.11.2 (El Capitan)

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] countrycode_0.18   ggplot2_2.1.0      RColorBrewer_1.1-2 foreign_0.8-66     maptools_0.8-39    rworldmap_1.3-6   
[7] sp_1.2-0          

loaded via a namespace (and not attached):
[1] Rcpp_0.12.4      lattice_0.20-33  grid_3.2.4       plyr_1.8.3       gtable_0.2.0     spam_1.3-0      
[7] scales_0.4.0     tools_3.2.4      munsell_0.4.3    maps_3.1.0       fields_8.3-6     colorspace_1.2-6

On Sat, Apr 9, 2016 at 7:34 PM, David Winsemius <dwinsemius at comcast.net> wrote:

On Apr 9, 2016, at 8:13 AM, Miluji Sb <milujisb at gmail.com> wrote:

Forgot to copy the list

Dear Jim,

Thank you for your reply. I must be doing something wrong, If this is my
command to plot a map of Europe:

eps_europe <- mapCountryData(n, nameColumnToPlot="eps_score", mapTitle="EPS
Score - Europe",colourPalette=colourPalette,
                          catMethod="fixedWidth", missingCountryCol =
"white", mapRegion="Europe", addLegend=FALSE)

The following command does not seem to add the arrow. What am I doing wrong?

do.call(addMapLegend, c(eps_europe, legendLabels="none",
arrows(-100,-140,100,-140,code=3)))

Your earlier question had a full world map. That was the context for Jim's reply, which did plot a two headed arrow above the legend in your earlier question. Now you have restricted the plot region to Europe so the coordinates of -100,-140,100,-140 no longer are on the visible plot area. You need to decide where you want the arrows using sensible coordinates.

--
David.

Thank you again. I really appreciate it.

Sincerely,

Milu

On Sat, Apr 9, 2016 at 12:20 PM, Jim Lemon <drjimlemon at gmail.com> wrote:

Hi Miluji,
Try this:

arrows(-100,-140,100,-140,code=3)

Jim


On Fri, Apr 8, 2016 at 10:24 PM, Miluji Sb <milujisb at gmail.com> wrote:

I am trying to draw maps for the world using:

library(rworldmap)
library(maptools)
library(RColorBrewer)


tmp2<- dput(head(pece,10))
structure(list(iso3 = c("AUS", "AUT", "BEL", "CAN", "CHE", "CHL",
"CZE", "DEU", "DNK", "ESP"), eps_score = c(0.877343773841858,
2.68984365463257, 1.31406247615814, 1.98046875, 2.61666655540466,
NA, 1.44414067268372, 2.34257817268372, 2.89687490463257,

2.15937495231628

), gov_eff = c(1.76499999562899, 1.85666667421659, 1.74500000476837,
1.88416666785876, 1.99181815710935, 1.21499997377396, 0.865833342075348,
1.64999999602636, 2.15416664878527, 1.36833332975705), sh_va_enint =
c(13.4375638961792,
8.90904521942139, 10.368335723877, 14.0469560623169, NA, NA,
13.5679216384888, 9.67090892791748, 10.5978908538818, 8.34146690368652
), rd_in_va = c(2.17547988891602, 2.47147130966187, 2.53955459594727,
2.01138758659363, NA, NA, 1.49587619304657, 2.72330951690674,
2.5316367149353, 1.48551619052887)), datalabel = "", time.stamp = " 9 Mar
2016 17:43", .Names = c("iso3",
"eps_score", "gov_eff", "sh_va_enint", "rd_in_va"), formats = c("%9s",
"%8.0g", "%10.0g", "%9.0g", "%9.0g"), types = c(6L, 254L, 255L,
254L, 254L), val.labels = c("", "", "", "", ""), var.labels = c("",
"(mean) eps_score", "(mean) gov_eff", "(mean) sh_va_enint", "(mean)
rd_in_va"
), expansion.fields = list(c("_dta", "ReS_i", "countrycode"),
 c("_dta", "ReS_ver", "v.2"), c("_dta", "ReS_j", "year"),
 c("_dta", "ReS_str", "0"), c("_dta", "ReS_Xij", "a_"), c("_dta",
 "__JVarLab", "ACT"), c("_dta", "__XijVarLabrdd_", "(sum) rdd"
 ), c("_dta", "__XijVarLabp", "Value"), c("_dta", "__XijVarLabpop",
 "Population"), c("_dta", "__XijVarLabest_lu_f", "Source of lu"
 ), c("_dta", "__XijVarLablu", "Percentage of No Schooling"
 ), c("_dta", "__XijVarLabest_lp_f", "Source of lp"), c("_dta",
 "__XijVarLablp", "Percentage of Primary"), c("_dta", "__XijVarLablh",
 "Percentage of Tertiary"), c("_dta", "__XijVarLabest_lh_f",
 "Source of lh"), c("_dta", "__XijVarLabls", "Percentage of Secondary"
 ), c("_dta", "__XijVarLabest_ls_f", "Source of ls"), c("_dta",
 "__XijVarLabvalue", "Value"), c("_dta", "_TStvar", "year"
 ), c("_dta", "_TSpanel", "id2"), c("_dta", "_TSdelta",
"+1.0000000000000X+000"
 ), c("_dta", "_TSitrvl", "1"), c("_dta", "tis", "year"),
 c("_dta", "iis", "id2")), version = 12L, row.names = c("1",
"2", "3", "4", "5", "6", "7", "8", "9", "10"), class = "data.frame")
n <- joinCountryData2Map(pece, joinCode="ISO3", nameJoinColumn="iso3")
n <- n[-which(row.names(n)=='Antarctica'),]

# EPS
colourPalette <- rev(brewer.pal(7, "RdYlGn"))

eps <- mapCountryData(n, nameColumnToPlot="eps_score", mapTitle="EPS
Score",colourPalette=colourPalette,
                   catMethod="fixedWidth", missingCountryCol =

"white",

addLegend=FALSE)
do.call(addMapLegend, c(eps, legendLabels="all", legendWidth=0.5))

Instead of adding numeric based legend, I would like to add a two-headed
arrow with some text. I would be grateful for any help. Thank you!

Sincerely,

Milu

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David Winsemius
Alameda, CA, USA

David Winsemius
Alameda, CA, USA

David Winsemius
Alameda, CA, USA