add

问题 Example data.frame: df = read.table(text = 'colA colB 2 7 2 7 2 7 2 7 1 7 1 7 1 7 89 5 89 5 89 5 88 5 88 5 70 5 70 5 70 5 69 5 69 5 44 4 44 4 44 4 43 4 42 4 42 4 41 4 41 4 120 1 100 1', header = TRUE) I need to add an index col based on colA and colB where colB shows the exact number of rows to group but it can be duplicated. colB groups rows based on colA and colA -1 . Expected output: colA colB index_col 2 7 1 2 7 1 2 7 1 2 7 1 1 7 1 1 7 1 1 7 1 89 5 2 89 5 2 89 5 2 88 5 2 88 5 2 70 5 3 70

问题 I have been told that we have to test also the functions created by Cake like add/delete... If i have a function like this one, how can i test it if it doesn't have any return, redirect or even a view? ( i use ajax to execute it) public function add() { if ($this->request->is('post')) { $this->Comment->create(); if ($this->Comment->save($this->request->data)) { $this->Session->setFlash(__('The comment has been saved')); } else { $this->Session->setFlash(__('The comment could not be saved.

问题 In MIPS assembly, what is the benefit of using addiu over addi ? Isn't addiu unsigned (and will ruin our calculations?) 回答1: and will ruin our calculations No, MIPS uses two's complement, hence the same instruction for addition/subtraction can be used for both signed and unsigned operations. There's no difference in the result. That's also true for bitwise instructions, non-widening multiplication and many other operations. See Which arithmetic operations are the same on unsigned and two's

问题 I want to add an object to an ArrayList , but each time I add a new object to an ArrayList with 3 attributes: objt(name, address, contact) , I get an error. import java.util.ArrayList; import java.util.Scanner; public class mainClass { public static void main(String args[]){ Scanner input = new Scanner(System.in); System.out.println("Plz enter Name : "); String name = input.nextLine(); System.out.println("Plz enter Address : "); String address = input.nextLine(); System.out.println("Plz enter

问题 I have a plot of time series in ggplot2 package and I have performed the Moving average and I would like to add the result of moving average to the plot of time series. Sample of Data-set (p31): ambtemp dt -1.14 2007-09-29 00:01:57 -1.12 2007-09-29 00:03:57 -1.33 2007-09-29 00:05:57 -1.44 2007-09-29 00:07:57 -1.54 2007-09-29 00:09:57 -1.29 2007-09-29 00:11:57 Applied code for time series presentation: Require(ggplot2) library(scales) p29$dt=strptime(p31$dt, "%Y-%m-%d %H:%M:%S") ggplot(p29,

问题 I have just bought a new iMac. I then downloaded the latest SDK 5.0 and installed XCode 4.2.1. Everything is working fine. Though I realized that there are only iPhone and iPad Simulators 5.0 available for debugging. So I went on clicking the More Simulators... I click Install for all items and a while passed, and when I came back, it indicated as "Installed". But when I go back to my XCode, there are still just Simulators 5.0 in the list. So, how do I go about installing the older simulators

问题 I have a class that extends JFrame, and it has a BorderLayout. It has two private instance variables of type JPanel. They represent panels of buttons and are called flipButton and confidenceButtons. When you click on the button, the panel of buttons is replaced by the other panel of buttons. That is, if you click on a button in flipButton, flipButton is replaced by confidenceButtons. I tried to do it like this: private class FlipListener implements ActionListener{ public void actionPerformed

问题 I have multiple file...it looks like: ATOM 1244 O VAL 160 7.381 11.465 -2.646 1.000 60.790 0.000 ATOM 1245 CB VAL 160 5.766 13.870 -0.914 1.000 57.640 0.000 ATOM 1246 CG1 VAL 160 7.232 14.074 -0.568 1.000 57.530 0.000 ATOM 1247 CG2 VAL 160 5.065 15.213 -1.089 1.000 58.420 0.000 ATOM 1248 N VAL 1 -14.324 -25.299 8.568 1.000 77.840 0.000 ATOM 1249 CA VAL 1 -14.315 -23.826 8.346 1.000 78.450 0.000 ATOM 1250 C VAL 1 -15.181 -23.169 9.426 1.000 76.690 0.000 Now i have to add "TER" after line: ATOM

问题 Git says to use git add to add untracked files to my repo. I have run unsuccessfully git add shells/zsh/keyboard_configs/ git add shells/zsh/references/ git add shells/zsh/keyboard_configs/* git add shells/zsh/references/* git add shells/zsh/keyboard_configs/*<TAB> git add shells/zsh/references/*<TAB> git add . I still get that the files are untracked when I see it at git status How can you git-add files at long PATHs? I run $git status ~/bin # On branch master # Untracked files: # (use "git

问题 I am in the process of designing a php validated form for a restaurant website which directs the user to a thank you page, displaying their reservation details, once they have pressed submit. Currently I have 2 variables, one named 'party', the other named 'vip'. These variables both display a string value when echoed. However, I wish to assign them an int value and then add them together to display a total price to the user. Currently I have this code which does not seem to function: <b