sample x <- 1:100 sample(x,30) sort(sample(x,60,replace = T)) sample(who$CountryID,30,replace = T) who[sample(who$CountryID,30),] #删除固定行 x <- mtcars[-1:-5,] x x$mpg <- NULL head(x) #数据合并 state.division data.frame(USArrests,state.division) ?cbind cbind(USArrest...
with(UScrime, t.test(U1, U2, paired=TRUE))## Paired t-test data: U1 and U2 t = 32.407, df = 46, p-value < 2.2e-16 alternative hypothesis: true difference in means is not equal to 0 95 percent confidence interval: 57.67003 65.30870 sample estimates: mean of the differences 61.48936...
df.applymap(lambda x: -math.log10(x**2)) 如果是字符串操作,但是有 NAN 的话会报错: 建议增加如下操作,即增加一个判断: df0 = raw.dropna(axis=1, how='all').applymap(lambda x: x.replace(' ', '') if pd.notnull(x) else x) 注意: 新版本已经舍弃applymap了,直接用map就可以了。 df...
transform函数的功能就是改变数据框中的变量 格式:transform(数据框,变量1=value,变量2=value,...) 如果变量在数据框中已经存在,则替换原有变量的值,如果不存在,就在后边添加新的变量。 2.变量的重编码 重编码涉及根据同一个变量和/或其他变量的现有值创建新值的过程。 要重编码数据,可以使用R中的一个或多个...
NaN代表无意义的结果(not a number) 当计算的结果无意义时,返回该值,如下(a computation will produce a result that makes little sense) > Inf - Inf [1] NaN > 0 / 0 [1] NaN NULL经常被用作函数的一个参数,用来代表no value was assigned to the argument。有一些函数也可能返回NULL值。
Then in both cases, you can simply replace nativeJSONcalls withJSON6: varobj=JSON6.parse('{unquoted:"key",trailing:"comma",}');varstr=JSON6.stringify(obj);/* uses JSON stringify, so don't have to replace */ JSON6 MethodsparametersDescription ...
The output after filling NA values with next and previous values will be − x 0 0 0 1 1 1 0 1 Consider the below data frame − Example Live Demo x1<-sample(c(NA,rpois(2,1)),20,replace=TRUE) x2<-sample(c(NA,rpois(2,5)),20,replace=TRUE) df1<-data.frame(x1,x2) df1 ...
library(cmfrec)n_users<-4n_items<-5n_ratings<-10n_user_attr<-4n_item_attr<-5k<-3set.seed(1)### 'X' matrix (can also pass it as TsparseMatrix, matrix.coo, etc.)ratings<-data.frame(UserId=sample(n_users,n_ratings,replace=TRUE),ItemId=sample(n_items,n_ratings,replace=TRUE),Rat...
Msgpackr is fast. Really fast. Here is comparison with the next fastest JS projects using the benchmark tool frommsgpack-lite(and the sample data is from some clinical research data we use that has a good mix of different value types and structures). It also includes comparison to V8 nativ...
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