如何使用if语句将整行分隔成新的数据帧
I have a data frame df that looks something like this: 我有一个数据框df看起来像这样: Date Company MarketCap2000-01-31 Company one 10002000-02...
熊猫:如何将单热编码数据帧转换为邻接矩阵?
I have a data frame df, of the form: 我有一个数据框df,形式如下: Col1 Col2 Col3 0 0 1 01 1 1 02 0 1 ...
在R中打印带有长字符串的数据帧
Let's have a dataframe with long strings in one column: 让我们在一列中有一个包含长字符串的数据帧: df<-data.frame(short=rnorm(10,0,1),long=replicate(10,paste(rep(sampl...
如何将读取的数据帧保存为R中的列表?
I have say about 10 .txt files in my directory that I read like this: 我在我的目录中说了10个.txt文件,我这样读了: sampleFiles <- list.files(directory)for (i in 1:len...
pandas在列上连接多个数据帧
I have 3 CSV files. Each has the first column as the (string) names of people, while all the other columns in each dataframe are attributes of that pe...
将空列添加到多个数据帧
I want to add multiple empty columns to multiple dataframes. I know the code to do this for 1 dataframe is df[,namevector] <- NA (other question). ...
修改pandas数据帧中的行子集
Assume I have a pandas DataFrame with two columns, A and B. I'd like to modify this DataFrame (or create a copy) so that B is always NaN whenever A is...
从numpy数组创建pandas数据帧
To create a pandas dataframe from numpy I can use : 要从numpy创建一个pandas数据框,我可以使用: columns = ['1','2']data = np.array([[1,2] , [1,5] , [2,3]])df_1 = pd....
使用标头和dtypes将pandas数据帧转换为numpy数组
I have been trying to convert a pandas dataframe into a numpy array, carrying over the dtypes and header names for ease of reference. I need to do thi...
如何通过多列分割/聚合大数据帧(ffdf) ?
ffbase provides the function ffdfdply to split and aggregate data rows. This answer (https://stackoverflow.com/a/20954315/336311) explains how that ca...
没有应用函数的pandas数据帧中的数据透视表
I have a pandas dataframe that looks like that: 我有一个像这样的pandas数据框: df = pd.DataFrame({ 'ID' : [2,2,2,2,2,4,4,3,3,3,6] , 'count' : [20,43,45,50,15,65,3...
如何在R中添加数据帧中的列
I have imported data from a file into a data frame in R. It is something like this. 我已经从一个文件中导入数据到r中的一个数据框架中。 Name Count CategoryA 100 ...
基于groupby拆分pandas数据帧
I want to split the following dataframe based on column ZZ 我想基于ZZ列拆分以下数据帧 df = N0_YLDF ZZ MAT 0 6.286333 2 11.669069 1 6.31...
Pandas,通过单值增加列值来分割数据帧
I have a gigantic dataframe with a datetime type column called time, and another float type column called dist, the data frame is sorted based on time...
如何将数据帧按行拆分为n块,应用函数并合并?
I have a data.frame of 130,209 rows. 我有一个130,209行的data.frame。 > head(dt) mLow1 mHigh1 mLow2 mHigh2 meanLow meanHigh fc mea...
如何比较两个数据帧/表并在R中提取数据?
In attempt to extract mismatches between the two data frames below I've already managed to create a new data frame in which mismatches are replaced. W...
Pandas数据帧获得每组的第一行
I have a pandas DataFrame like following. 我有一个像下面这样的pandas DataFrame。 df = pd.DataFrame({'id' : [1,1,1,2,2,3,3,3,3,4,4,5,6,6,6,7,7], 'v...
如何按键/值交错两个数据帧中的行?
I would like to combine data from two tables by interleaving them based on time stamp. Because the "Box" column has multiple values they are of unequa...
Pandas数据帧fillna()只有一些列到位
I am trying to fill none values in a Pandas dataframe with 0's for only some subset of columns. 我试图在Pandas数据帧中填充任何值,只有一些列的子集为0。 When I do: 当我做: import...
如何使用来自几个列的值对熊猫数据帧进行排序?
I have the following data frame: 我有以下数据框架: df = pandas.DataFrame([{'c1':3,'c2':10},{'c1':2, 'c2':30},{'c1':1,'c2':20},{'c1':2,'c2':15},{'c1':2,'c2':10...