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问题 I tried to installed visual studio 2010 and it installed .net 4 only. i want to add .net 3.5 to the visual studio. I have installed the 3.5 and now i'm having problem with add .net 3.5 to the new visual studio. how can i add 3.5 to vs 2010? 回答1: You don't need to "add" .NET 3.5 to VS2010. When you create a new project, you just specify which version of .NET you want to target. (You can change this later, too, in project properties.) 回答2: Try this link: http://www.microsoft.com/downloads/en

问题 import java.awt.*; // Contains the Classes for Controls public class increment extends EasyApp // EasyApp provides simplified commands { // for creating controls and making public static void main(String[] args) // the actions method simpler { new increment(); } //-------- creating CONTROLS ----------------------------------- List nums = addList("2|4|6",160,200,50,40,this); TextField number = addTextField("",50,200,100,40,this); public increment() // Constructor { // This runs at the

问题 I am creating a form where the column and rows should automatically add their data, but I have to generate the name based on DB data and have to use a loop to add details. Adding column is perfect but adding the rows is quite difficult here :) How can I add rows and column together by one input data? And also add last column total (which is not editable) Notes: My input rows will be generated using loop function, so if you want to change class-name , id etc, then change inside both table rows

问题 I know this is a repost, I have done my research on everything possible and I couldn't find anything to assist nor help me with my current problem. No matter how many times I re-create my Query or Form, I just can't seem to get it to work correctly. if I run my Query, I will get the correct information displayed, but when it comes to adding information through a custom form I made, I get this error -> "cannot add records join key of table not in recordset" . My current Query, incase you

问题 var search_name = location.search; if (search_name.search("cate_no=24") > 0) { $(".cate_new a").addClass("active"); } }); If current document url is http://abc.com/list.html?cate_no=24, I want to add class "active" into li a. I searched and found these js code, but it doesn't work. Is it wrong? 回答1: It's incorrect. search() returns the offset position of a match if a match is found, and -1 if a match isn't found. As you are checking for whether cate_no=24 contains cate_no=24 , it will return

问题 I have a matlab function myfunction(var1,var2) which gives me a plot with a legend. I would like to generate more plots with this function in one graph. This works so far i.e. for 2 plots in one graph with: myfunction(a,b) hold on myfunction(c,d) hold off The problem here is that the legend which is generated for each plot with: legend(sprintf('%s%s',var1,' on ',var2)) legend('boxoff') is only appearing for the last instance of myfunction (in this case with myfunction(c,d) , there would be

问题 I have a data frame and I want to select the rows that match some criteria. The criteria is a function of values of other columns and some additional values. Here is a toy example: >>df = pd.DataFrame({'A': [1,2,3,4,5,6,7,8,9], 'B': [randint(1,9) for x in xrange(9)], 'C': [4,10,3,5,4,5,3,7,1]}) >> A B C 0 1 6 4 1 2 8 10 2 3 8 3 3 4 4 5 4 5 2 4 5 6 1 5 6 7 1 3 7 8 2 7 8 9 8 1 and I want select all rows for which some function returns true, e.g. f(a,c,L) returns true iff the multiplication AxC

问题 I'm currently studying the xv6 OS. I found out here how to add a system call by modifying the MAKEFILE file. My question is: how do we add simple text files or any other kind of file to be seen in the xv6 system once it boots? 回答1: README file in Xv6 is a generic file too. Searching for occurrences of README in the MakeFile and adding your required file will be sufficient. Suppose new.txt is the file you want to add. Parts of the MakeFile to be changed are: 1) fs.img: mkfs README new.txt $

问题 I am trying to make a python script that will search a directory for all files that end with a specific file extension called .math (basically a text file with numbers inside of them). How would I approach doing so? Imagine I have files hello.math, hello2.math, and goodbye.math Lets say hello.math has 10, hello2.math has 3 and goodbye.math has 0. i would want the script to search for all of the .math files in the current directory then sum them up. 回答1: So not sure if you want to recursively

问题 This question seems basic but I have not been able to find an answer to it. I want to add columns of a data.frame together by just referring to their indeces. Suppose I want to add columns 1,2, and 4. df <- data.frame( a=rep(1, 5), b=rep(2, 5), c=rep(3, 5), d=rep(4, 5) ) I know that explicitly referring to the column names I can do > df$a + df$b + df$d [1] 7 7 7 7 7 And referring to indeces I can do > df[1] + df[2] + df[4] a 1 7 2 7 3 7 4 7 5 7 However, the index option above requires me to