sample

问题 This question already has answers here : Sample random rows in dataframe (10 answers) Closed 6 years ago . Is there a good way of getting a sample of rows from part of a dataframe? If I just have data such as gender <- c("F", "M", "M", "F", "F", "M", "F", "F") age <- c(23, 25, 27, 29, 31, 33, 35, 37) then I can easily sample the ages of three of the Fs with sample(age[gender == "F"], 3) and get something like [1] 31 35 29 but if I turn this data into a dataframe mydf <- data.frame(gender, age

问题 I want to bring the list of what apps are installed in my iPhone. I hear this code sample is in this website but I can't find it. Code Sample: Check if an app is installed - iDevKit: http://idevkit.com/forums/tutorials-code-samples-sdk/604-code-sample-check-if-app-installed.html Can anyone give me a hint or how to get that code from the website? Thanks. 回答1: This is not possible on non-jailbroken iOS devices—the app sandbox prevents it. You can test for some individual applications, if you

问题 So I was just answering a question and I came across something interesting: The dataframe looks like this: string1 string2 0 abc def 1 ghi jkl 2 mno pqr 3 stu vwx So when I do the following, the assigning of new columns works: df['string3'] = df.string2 print(df) string1 string2 string3 0 abc def def 1 ghi jkl jkl 2 mno pqr pqr 3 stu vwx vwx But when I use pandas.DataFrame.Series.sample , the new column does net get assigned, at least not the sampled one: df['string4'] = df.string2.sample(len

问题 I am trying to pull a random sample of a population from a Peoplesoft Database. The searches online have lead me to think that the Sample Clause of the select statement may be a viable option for us to use, however I am having trouble understanding how the Sample clause determines the number of samples returned. I have looked at the oracle documentation found here: http://docs.oracle.com/cd/E11882_01/server.112/e26088/statements_10002.htm#i2065953 But the above reference only talks about the

问题 I just installed the Nfc Demo from google, but it doesn´t read the information from the Tag.-> It just provides some fakeTag information. Has anybody an idea, where I can change the sample to read from the nfc Tag? Or has somebody a working nfc demo for the nexus? If we could bring a nfc demo to work, many people would have the possibility to develop a nfc demo on their own. Best regards Alexander 回答1: I had the same problem getting tag id. I got some B@2346323143 style data to screen. I got

问题 I'm trying to implement the navigation drawer pattern based on my app. I downloaded the sample code from here and i ran it and 90 % of the times the drawer works ok, but sometimes the drawer gets stuck when i try to open it. I have a way of replicating the situation but it doesn't always work. What i do is: 1- Run the sample code as is. 2- Put your finger on the left edge to get the drawer peek 3- Let go of the finger and press it on the main fragment 4- Try to open the drawer as usual

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . I am looking for source code for a complete application that uses the Webstart Maven Plugin. Any ideas? 回答1: I tried the webstart plugin in a prrof of concept involving an embedded tomcat server. The plugin is bound to the package phase and takes a longtime to execute, I would recommend to invoke it manually

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . I am looking for source code for a complete application that uses the Webstart Maven Plugin. Any ideas? 回答1: I tried the webstart plugin in a prrof of concept involving an embedded tomcat server. The plugin is bound to the package phase and takes a longtime to execute, I would recommend to invoke it manually

问题 I'm trying to take out samples from two dataframes wherein I need the ratio of count maintained. eg df1.count() = 10 df2.count() = 1000 noOfSamples = 10 I want to sample the data in such a way that i get 10 samples of size 101 each( 1 from df1 and 100 from df2) Now while doing so, var newSample = df1.sample(true, df1.count() / noOfSamples) println(newSample.count()) What does the fraction here imply? can it be greater than 1? I checked this and this but wasn't able to comprehend it fully.

问题 I'm looking for an example Spring MVC 2.5 web app that I can easily: Setup as a project in Eclipse Deploy to a local app server (using Ant/Maven) There are a couple of example applications included with the Spring distribution ('petclinic' and 'jpetstore'), but they don't provide any Eclipse project files (or a way to generate them). They also seem a bit complicated for my needs, e.g. require a local database to be setup. 回答1: While not specifically an app you can download, Developing a