sample

问题 input = ['beleriand','mordor','hithlum','eol','morgoth','melian','thingol'] I'm having trouble creating X number of lists of size Y without repeating any elements. What I have been doing is using: x = 3 y = 2 import random output = random.sample(input, y) # ['mordor', 'thingol'] but if I repeat this then I will have repeats. I would like the output to be something like [['mordor', 'thingol'], ['melian', 'hithlum'], ['beleriand', 'eol']] since I chose x = 3 (3 lists) of size y = 2 (2 elements

问题 I am trying to generate a random sequence from a fixed number of characters that contains at least one of each character. For example having the ensemble m = letters[1:3] I would like to create a sequence of N = 10 elements that contain at least one of each m characters, like a a a a b c c c c a I tried with sample(n,N,replace=T) but in this way also a sequence like a a a a a c c c c a can be generated that does not contain b . 回答1: f <- function(x, n){ sample(c(x, sample(m, n-length(x),

问题 This question already has answers here : Histogram of uniform distribution not plotted correctly in R (3 answers) Closed 4 years ago . The following code will return a perfectly sound sample: b <- sample(c(0,1,2,3,4,5,6,7,8,9,10,11,12), 100000, replace=TRUE) hist(b) Increasing the number for elements by 1 to 14 will result into this: b <- sample(c(0,1,2,3,4,5,6,7,8,9,10,11,12,13), 100000, replace=TRUE) hist(b) That's clearly not correct. Zero occurs more often that it should. Is there a

问题 Hi i want to create 2 Button and i want to multitouch ?? i tryed to do but no example in internet.. So if you got one can you share or can you give me opinion ?? my code is this but not support multitouch package multi.touch; import android.app.Activity; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.AbsoluteLayout.LayoutParams; import android.widget.Button; import android.widget.TextView;

问题 Hi i want to create 2 Button and i want to multitouch ?? i tryed to do but no example in internet.. So if you got one can you share or can you give me opinion ?? my code is this but not support multitouch package multi.touch; import android.app.Activity; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.AbsoluteLayout.LayoutParams; import android.widget.Button; import android.widget.TextView;

问题 If I want to randomly select some samples from different groups I use the plyr package and the code below require(plyr) sampleGroup<-function(df,size) { df[sample(nrow(df),size=size),] } iris.sample<-ddply(iris,.(Species),function(df) sampleGroup(df,10)) Here 10 samples are selected from each species. Some of my dataframes are very big and my question is can I use the same sampleGroup function with the dplyr package? Or is there another way to do the same in dplyr? EDIT Version 0.2 of the

问题 If I want to randomly select some samples from different groups I use the plyr package and the code below require(plyr) sampleGroup<-function(df,size) { df[sample(nrow(df),size=size),] } iris.sample<-ddply(iris,.(Species),function(df) sampleGroup(df,10)) Here 10 samples are selected from each species. Some of my dataframes are very big and my question is can I use the same sampleGroup function with the dplyr package? Or is there another way to do the same in dplyr? EDIT Version 0.2 of the

问题 I have created cucumber framework. I have 60 fields in my future file and it is very difficult for me to enter the data. Is there any possibility to load the data from excel in cucumber framework. Any sample Code is available? 来源： https://stackoverflow.com/questions/48180719/cucumber-excel-data-read

问题 I am creating a debian package for a library and would like to install binary samples. I was thinking to put them under /usr/share/libname , but lintian complains (arch-dependent-file-in-usr-share). According FHS this correct, but where can put those files? 回答1: It's actually not correct according to the FHS; /usr/share is quite explicitly for "architecture-independent data". /usr/lib is the arch-dependent equivalent, and that's probably what you want ( /usr/lib/libname ). See http://www

问题 I have two data frames. One data frame ( Partners.Missing ) contains 195 people who are partnered (married, de facto, etc) for which I need to construct the partner, using a random selection from a second data frame ( NAsOnly ). The Partners.Missing data frame information is: str(Partners.Missing) 'data.frame': 195 obs. of 8 variables: $ V1 : Factor w/ 2 levels "Female","Male": 1 1 1 2 1 1 1 2 2 2 ... $ V2 : Factor w/ 9 levels "15 - 17 Years",..: 4 4 7 7 4 4 7 3 7 4 ... $ V3 : Factor w/ 1