multiple-columns

问题 I have a data frame with multiple columns. Now, I want to get rid of the row.names column (column 1), and thus I try to select all the other columns. E.g., newdata <- olddata[,2:10] is there a default symbol for the last column so I don't have to count all the columns? I tried newdata <- olddata[,2:] but it didn't work. 回答1: I think it's better to focus on wanting to get rid of one column of data and not wanting to select every other column. You can do this as @Arun suggested: olddata[,-1] Or

问题 I have a single div named .wrap within which items are placed. An unknown amount of items ( .thing ) should be arranged into four columns (stacking on top of each other). <div class="wrap"> <div class="thing"> thing1 </div> <div class="thing"> thing2 </div> ... </div> The columns need to be evenly distributed so that no column is empty. This would be very easy using: .wrap { column-count: 4; column-fill: balance; } However, column-fill only works in Firefox, I believe. Is there another CSS

问题 Since starting in WPF I am still struggling to understand the data binding functionality. I am trying to use a multi column list box and my XAMl looks like this: <ListBox Name="RecordList"> <ListView Name="RecordListView"> <ListView.View> <GridView> <GridView.Columns> <GridViewColumn Header="1" Width="Auto" DisplayMemberBinding="{Binding Path=Field1}" /> <GridViewColumn Header="2" Width="50" DisplayMemberBinding="{Binding Path=Field2}" /> <GridViewColumn Header="3" Width="100"

问题 I have to build a table with 5 columns. The table width is variable (50% of content width). Some columns contain fixed-size buttons, so those columns should have a fixed with, say 100px. Some columns have text in them, so I want those columns to have variable column widths. For example: Column1: 20% of (tablewidth - sum(fixedwidth_columns))' Column2: 100px Column3: 40% of (tablewidth - sum(fixedwidth_columns)) Column4: 200px Column5: 40% of (tablewidth - sum(fixedwidth_columns)) What is the

问题 I have a 2D array in python modeled by a list of lists and I want to extract the column. I made a quick research and I found a way that uses numpy arrays. The problem is that I do not want to use numpy so I don't want to convert my list of lists into a numpy array and then use [:,1] syntax. I tried using it on a normal list of lists but it shows an error so it's not possible. I am asking for a similar thing for list of lists without having to go through each element(In numpy arrays, it's

问题 I have a 2D array in python modeled by a list of lists and I want to extract the column. I made a quick research and I found a way that uses numpy arrays. The problem is that I do not want to use numpy so I don't want to convert my list of lists into a numpy array and then use [:,1] syntax. I tried using it on a normal list of lists but it shows an error so it's not possible. I am asking for a similar thing for list of lists without having to go through each element(In numpy arrays, it's

问题 I have a list of dataframes: set.seed(23) date_list = seq(1:30) testframe = data.frame(Date = date_list) testframe$ABC = rnorm(30) testframe$DEF = rnorm(30) testframe$GHI = seq(from = 10, to = 25, length.out = 30) testframe$JKL = seq(from = 5, to = 45, length.out = 30) testlist = list(testframe, testframe, testframe) names(testlist) = c("df1464", "df6355", "df94566") I want now to extract the name of each dataframe and add it to its columns. So the columnnames of the first dataframe in the

问题 I have dataframe looks like this: df Data1 Data2 Data3 A XX AA A YY AA B XX BB B YY CC C XX DD C YY DD D XX EE D YY FF I want to delete all the row (column data3) based on two columns (data1 and data2) with the condition if the data on data3 is same the delete. my expected result looks like this: Data1 Data2 Data3 B XX BB B YY CC D XX EE D YY FF how to do it? 回答1: Using groupby + transform with nunique yd=df[df.groupby(['Data1']).Data3.transform('nunique').gt(1)].copy() Out[506]: Data1 Data2

问题 Need to remove multiple rows within a CSV file in Excel based on a match in column L on sheet1 with column A on sheet2. The content is email addresses. How can I achieve this? So, if sheet2 column A has an email address that matches any of the email addresses in sheet1 - Column L, than it should remove the entire row from sheet1 where that email address is located. Sheet1 below: Sheet2 below: @mehow, here's the image I get when I run your code as a module: 回答1: This will work, very fast for

问题 Original Issue: I am using readdir to snag file names from multiple directories. I was wondering if there is a way to arrange the data so that each time it starts a new directory it makes a new column i.e. ---| user1 | user2 | user3 | ---| file1a | file2a | file3a | ---| file1b | file2b | file3b | ---| file1c | file2c | file3c | ---| file1d | ^ | file3d | ---| file1e | | | ^ | ---| ^ | end | | | ---| | | dir2 | end | ---| end | #start | dir3 | ---| dir1 | col3 | etc. | ---| #start | | | ---|