Question

示例数据框：

df = pd.DataFrame({
    'audio': ['audio1', 'audio2', 'audio3'],
    'col1': ['A', 'B', 'C'],
    'col2': ['D', 'E', 'F']
})

对于这样的行，我需要随机获取列“ audio”的值和col1或col2列的值：

audio  value (value is random value from col1 or col2)
audio1 A
audio2 E
audio3 C

Answer 1

这是一种基于library(shiny) library(DT) server <- function(input, output) { output$iris_type <- DT::renderDataTable({ datatable(data.frame(Species=paste0("<a href='#filtered_data'", "alt='",unique(iris$Species),"'", "onclick=\"", "tabs = $('.tabbable .nav.nav-tabs li');", "tabs.each(function() {", "$(this).removeClass('active')", "});", "$(tabs[1]).addClass('active');", "tabsContents = $('.tabbable .tab-content .tab-pane');", "tabsContents.each(function() {", "$(this).removeClass('active')", "});", "$(tabsContents[1]).addClass('active');", "$('#filtered_data').trigger('change').trigger('shown');", "Shiny.onInputChange('species', getAttribute('alt'));", "Shiny.onInputChange('dataset', 'Filtered Data');", "\">", unique(iris$Species), "</a>")), escape = FALSE) }) output$filtered_data <- DT::renderDataTable({ if(is.null(input$species)){ datatable(iris) }else{ datatable(iris[iris$Species %in% input$species, ]) } }) } ui <- fluidPage( sidebarLayout( sidebarPanel( conditionalPanel( 'input.dataset === "Iris Type"', helpText("This is the full Iris panel") ), conditionalPanel( 'input.dataset === "Filtered Data"', helpText("This is the filtered panel") ), width = 2 ), mainPanel( tabsetPanel( id = 'dataset', tabPanel("Iris Type", DT::dataTableOutput("iris_type")), tabPanel("Filtered Data", DT::dataTableOutput("filtered_data")) ) )) ) shinyApp(ui = ui, server = server)的方法：

numpy

v = df[['col1', 'col2']].values
ix = np.random.randint(0,v.shape[1],df.shape[0])
df['value'] = np.take_along_axis(v, ix[:,None], 1)

Answer 2

您还可以尝试使用axis=1进行采样：

df.set_index('audio').sample(n=1,axis=1)
#df.set_index('audio').apply(np.random.choice,axis=1) #for random values in each row

示例：

i=1
while i < 6:
    print(df.set_index('audio').sample(n=1,axis=1),'\n')
    i += 1

        col2
audio      
audio1    D
audio2    E
audio3    F 

       col2
audio      
audio1    D
audio2    E
audio3    F 

       col1
audio      
audio1    A
audio2    B
audio3    C 

       col1
audio      
audio1    A
audio2    B
audio3    C 

       col2
audio      
audio1    D
audio2    E
audio3    F

熊猫从两列中获取随机值

2 个答案: