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如何在flexdashboard中创建下拉菜单?

我有以下数据:

library(leaflet)
library(leaflet.extras)
library(flexdashboard)
library(htmltools)
library(htmlwidgets)
library(plotly)
id = 1:1000
long = 2.2945 + rnorm( 1000, 0.1085246 , 0.1)
lat = 48.8584 + rnorm( 1000, 0.009036273 , 0.1)
my_data_1 = data.frame(id, lat, long)
id = 1:1000
long = 2.2945 + rnorm( 1000, 0.1085246 , 0.1)
lat = 48.8584 + rnorm( 1000, 0.009036273 , 0.1)
my_data_2 = data.frame(id, lat, long)
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使用这些数据,我制作了这些地图:

map1 = my_data_1 %>%
    leaflet() %>%
    addTiles() %>%
    addHeatmap(lng=~long,lat=~lat,max=100,radius=20,blur=10)

map2 = my_data_2 %>%
    leaflet() %>%
    addTiles() %>%
    addHeatmap(lng=~long,lat=~lat,max=100,radius=20,blur=10)

map3 = …
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html r r-markdown flexdashboard

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