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Starting from @AndrewGustar answer/code: Expand data.frame by creating duplicates based on group condition 1) What about if I have the input data.frame with ID values not in sequence and that can also duplicate theirselves? Example data.frame: df = read.table(text = 'ID Day Count Count_group 18 1933 6 11 33 1933 6 11 37 1933 6 11 18 1933 6 11 16 1933 6 11 11 1933 6 11 111 1932 5 8 34 1932 5 8 60 1932 5 8 88 1932 5 8 18 1932 5 8 33 1931 3 4 13 1931 3 4 56 1931 3 4 23 1930 1 1 6 1800 6 10 37 1800 6 10 98 1800 6 10 52 1800 6 10 18 1800 6 10 76 1800 6 10 55 1799 4 6 6 1799 4 6 52 1799 4 6 133 1799

the program gives me loss of precision error but i cant think of any precision loss since numbers are small This is the code ## class Demo { public static void main(String args[]) { byte b1=3; byte b2=2; byte b3=b1+b2; System.out.println(b3); } } Jon Skeet The addition expression b1 + b2 is of type int - there aren't any addition operators defined on smaller types than int . So in order to convert that back to a byte , you have to cast: byte b3 = (byte) (b1 + b2); Note that although you happen to know that the values are small, the compiler doesn't care about the values you've set in the

I have a ModelForm for my Risk set up as: class RiskForm(forms.ModelForm): class Meta: model = Risk fields = '__all__' def __init__(self, *args, **kwargs): progid = kwargs.pop('progid') super(RiskForm, self).__init__(*args,**kwargs) dict_of_fields = {} all_char = Program.objects.get(id=progid).char_set.all() for char in all_char: c = [] for cat in char.cat_set.all(): c.append( (cat.label, cat.label) ) dict_of_fields[char.label] = c self.fields[char.label] = forms.ChoiceField(c) Where the Risk Object is defined as: class Risk(models.Model): program = models.ForeignKey(Program, on_delete=models

I'm working in this school project. I have two std_logic_vector (31 downto 0) A and B, and I have a variable type std_logic_vector (32 downto 0) and I want to add A+B and put the result in my std_logic_vector with 32 bits. This is my design: library IEEE; use IEEE.STD_LOGIC_1164.ALL; USE ieee.numeric_std.ALL; use ieee.std_logic_arith.all; entity Ej3 is Port ( A : in STD_LOGIC_VECTOR (31 downto 0); B : in STD_LOGIC_VECTOR (31 downto 0); S : out STD_LOGIC_VECTOR (31 downto 0); AluOp : in STD_LOGIC_VECTOR (3 downto 0); COut : out STD_LOGIC; Z : out STD_LOGIC; OFL : out STD_LOGIC); end Ej3;

I have an int[3][3] array and it contains only 0 or 1 values, if the value is 1 I want to add the coordinates of this value in the ArrayList as int[2] array, but I don't know why it always add the last 1-value coordinates, what's the problem? public static void main(String[] args) { Random random = new Random(); int[] coordinates = new int[2]; ArrayList<int[]> arrayList = new ArrayList<>(); int[][] board = new int[3][3]; for (int i = 0; i < board.length; i++) { for (int j = 0; j < board[i].length; j++) { board[i][j] = random.nextInt(2); } } for (int i = 0; i < board.length; i++) { for (int j =

I am making an android application that needs to use a ListView . I want to add a menubutton that says "Add to list" and once the user presses that menubutton, it pops up a popupwindow containing a TextView , EditText and two Buttons , "Ok" and "Cancel". Once the user presses "Ok", the text inside the EditText should be added to the ListView . And the cancel Button is obvious. I also want to be able to long press on a ListView item to open a popupwindow containing a delete Button . I want to design the ListView screen using XML. How can i make this possible??? Please help me and thanks SO much

This is how I initialize my NSMutablearray. I copy the content of cityList into cityArray. Both are NSMutableArray. FYI, I declared the'cityArray' using extern. cityArray = [[NSMutableArray alloc] init]; [cityArray addObjectsFromArray:cityList]; Then, in other method in another class, I tried to to add one more object into 'cityArray' This is how I do it. But it keep crashing when it run this line of code. NSString *allCities = @"All Cities"; [[cityArray valueForKey:@"cityName"] addObject:allCities]; This is from the console '[__NSArrayI addObject:]: unrecognized selector sent to instance

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 5 3 70 5 3 69 5 3 69 5 3 44 4 4 44 4 4 44 4 4 43 4 4 42 4 5 42 4 5 41 4 5 41 4 5 120 1 6 100 1 7 UPDATE