row

问题 I have done this in java where I sum the values of the price column/row. But I am wondering how to do this in JavaFX. I want to sum everything in column 1 and display it in a inputField , I used this to do it in java but how do you do this in JavaFX? tableview.getValueAt(i, 1).toString(); Here is what I'm trying to do: int sum = 0; for (int i = 0; i < tableview.getItems().size(); i++) { sum = sum + Integer.parseInt(tableview.getValueAt(i, 1).toString()); } sumTextField.setText(String.valueOf

问题 I've a problem in Android, that i can't solved no matter what i've tried. Imagine a tablelayout which has 3 tablerows, and each row two textfields. Image : Couldn't Add Image Here, Due To New User Restrictions [Right Now Only Focus On "Showing Data"] I need to align columns in each row equally. (meaning : r[ 0 ]c[ 0 ].width = r[ 1]c[ 0 ].width = r[ 2 ]c[ 0 ].width etc..) However, i've different strings in textviews, and some of them are short, some of them long. Using 0dp as width and 1 as

问题 I've a problem in Android, that i can't solved no matter what i've tried. Imagine a tablelayout which has 3 tablerows, and each row two textfields. Image : Couldn't Add Image Here, Due To New User Restrictions [Right Now Only Focus On "Showing Data"] I need to align columns in each row equally. (meaning : r[ 0 ]c[ 0 ].width = r[ 1]c[ 0 ].width = r[ 2 ]c[ 0 ].width etc..) However, i've different strings in textviews, and some of them are short, some of them long. Using 0dp as width and 1 as

问题 I'm having a difficulty properly shrinking down the row numbers in a data frame. I have a data set named "mydata" which I imported from a text file using R . The data frame has about 200 rows with 10 columns. I removed the row number 3, 7, 9, 199 by using: mydata <- mydata[-c(3, 7, 9, 199),] When I run this command, the row 3,7,9,199 are gone from the list but the row number doesn't automatically shrink down to 196, but stays at 200. I feel like somehow these row numbers are attached to each

问题 I want to extend a dategridview with a (read only) column just for row number. The ROW NUMBER row`s order should not change when datagridview sort by other column content (Like excel)! is possible? 回答1: We can enumerate each row in one of two ways: Adding a new column. Within the row header. Displaying in Added Column private void AddIndexCol() { DataGridViewTextBoxColumn col = new DataGridViewTextBoxColumn(); col.Name = "Index"; col.HeaderText = "Index"; col.ReadOnly = true; col.AutoSizeMode

问题 Is there any limit to maximum row of table in DBMS (specially MySQL)? I want create table for saving logfile and it's row increase so fast I want know what shoud I do to prevent any problem. 回答1: You should periodically move log rows out to a historical database for data mining and purge them from the transactional database. It's a common practice. 回答2: I don't think there is an official limit, it will depend on maximum index sizes and filesystem restrictions. From mySQL 5.0 Features: Support

问题 I'm new to python and struggling to manipulate data in pandas library. I have a pandas database like this: Year Value 0 91 1 1 93 4 2 94 7 3 95 10 4 98 13 And want to complete the missing years creating rows with empty values, like this: Year Value 0 91 1 1 92 0 2 93 4 3 94 7 4 95 10 5 96 0 6 97 0 7 98 13 How do i do that in Python? (I wanna do that so I can plot Values without skipping years) 回答1: I would create a new dataframe that has Year as an Index and includes the entire date range

问题 I want to know how to get a specific row from a table in R. For example, > a <- c(13,13, 14,14,14,14,14,14, 15,15,15,15,15,15, 16,16,16,16,16,16,16,16,16,16,16,16,16,16,16, 17,17,17,17,17,17,17, 18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18, 19,19,19,19,19,19,19,19,19,19,19, 20,20,20,20,20,20,20,20,20, 21,21,21,21,21,21,21,21,21,21,21, 22,22,22,22,22,22,22,22,22, 23,23,23,24,25,25,27) > table(a) a 13 14 15 16 17 18 19 20 21 22 23 24 25 27 2 6 6 15 7 17 11 9 11 9 3 1 2 1 How do I extract

问题 I want to know how to get a specific row from a table in R. For example, > a <- c(13,13, 14,14,14,14,14,14, 15,15,15,15,15,15, 16,16,16,16,16,16,16,16,16,16,16,16,16,16,16, 17,17,17,17,17,17,17, 18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18, 19,19,19,19,19,19,19,19,19,19,19, 20,20,20,20,20,20,20,20,20, 21,21,21,21,21,21,21,21,21,21,21, 22,22,22,22,22,22,22,22,22, 23,23,23,24,25,25,27) > table(a) a 13 14 15 16 17 18 19 20 21 22 23 24 25 27 2 6 6 15 7 17 11 9 11 9 3 1 2 1 How do I extract

问题 I have a table with rows that have the of custom attribute with each other. I want to hide all the table rows except for the parent row using jQuery (or Javascript). How can I go by doing this? <table> <tr group="1">Parent</tr> <tr group="1">Child</tr> <tr group="1">Child</tr> <tr group="1">Child</tr> </table> Edit: Wow big typo on my part, I am terribly sorry, I meant custom attribute. Updated! 回答1: With your new example, it's possible using jQuery's atribute equals selector (here). Take a