slice

List of combination between rows of diagonal block matrix

由 旧城冷巷雨未停 提交于 2019-12-13 15:25:22
问题 I have the following R matrix that is a combination of 2x3 and 3x3 submatrices and it can be more than 2 submatrices with different dimension (e.g. m1xp and m2xp and m3xp where each of m1,m2,m3 <= p) A2 <- list(rbind(c(1,1,1),c(-1,1,-1)), rbind(c(-1,1,1),c(1,-1,2),c(2,-1,2))) library(Matrix) A2 <- as.matrix(Matrix::bdiag(A2)) Rhs <- matrix(c(0,5,0.5,4),nrow = 4) beta <- c(rep(1.2,3),c(0.5,0.2,0.1)) > A2 [,1] [,2] [,3] [,4] [,5] [,6] [1,] 1 1 1 0 0 0 [2,] -1 1 -1 0 0 0 [3,] 0 0 0 -1 1 1 [4,] 0

How to inspect slice header?

由 浪尽此生 提交于 2019-12-13 15:19:37
问题 This is slightly modified code from slices var buffer [256] byte func SubtractOneFromLength(slice []byte) []byte { slice = slice[0 : len(slice)-1] return slice } func main() { slice := buffer[10:20] fmt.Println("Before: len(slice) =", len(slice)) newSlice := SubtractOneFromLength(slice) fmt.Println("After: len(slice) =", len(slice)) fmt.Println("After: len(newSlice) =", len(newSlice)) newSlice2 := SubtractOneFromLength(newSlice) fmt.Println("After: len(newSlice2) =", len(newSlice2)) } It says

Rails gem to break a paragraph into series of sentences

由 拟墨画扇 提交于 2019-12-13 11:34:38
问题 I'm trying to split a paragraph into series of sentences such that each sentence group stays under N characters. In case of a single sentence that is longer than N, it should be split into chunks with punctuation marks or spaces as separators. E.g., if N = 50, then the following string "Lorem ipsum, consectetur elit. Donec ut ligula. Sed acumsan posuere tristique. Sed et tristique sem. Aenean sollicitudin, sapien sodales elementum blandit. Fusce urna libero blandit eu aliquet ac rutrum vel

Behaviour of pointer in slice

由 守給你的承諾、 提交于 2019-12-13 09:50:07
问题 What's the behavior of creating slice from slice? When you have slice defined like this: s := []int{2, 3, 5, 7, 11, 13} And you want to modify your slice like this: s = s[:3] // s = [2 3 5] s = s[:cap(s)] // s = [2 3 5 7 11 13] It actually works to "expand right" your slice. Which doesn't work is: s = s[2:] // s = [5 7 11 13] s = [:cap(s)] // s = [5 7 11 13] So you can't "retain" the first two elements in this case, when you've created new slice. Even if the underlying array didn't change,

How to get a sample of random numbers in golang? [closed]

由 一个人想着一个人 提交于 2019-12-13 09:48:52
问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed last year . Or I have to use straightforward way like: var arr []int for i := 0; i < 5; i++ { arr = append(arr, rand.Intn(100)) } 回答1: What you did is clean and fast enough. What you could improve on it is to pre-allocate the slice and fill it using a for.. range loop like this: s := make([]int, 5) for i :=

VHDL: slice a various part of an array

由 泪湿孤枕 提交于 2019-12-13 08:59:48
问题 I have a STD_LOGIC_VECTOR (0 to 639) . On an incoming signal I have to iterate through this vector and get next 2 bits of it. I'm trying to make something like, with an integer counter : counter := counter+1; MyVar := Data((counter*2) to ((counter*2)+1)); I get the following: Error (10394): VHDL error at module.vhd(227): left bound of range must be a constant upd: the following was suggested by @user1155120: writing every single bit of vector to every single corresponding bit of MyVar MyVar(0

Netty-源码分析ByteBuf-slice和retainedSlice使用细节

由 家住魔仙堡 提交于 2019-12-13 08:36:39
Netty-源码分析ByteBuf-slice和retainedSlice使用细节 slice() = slice(buf.readerIndex(), buf.readableBytes()) 源码片段，返回原始ByteBuf可读字节的一部分， 修改返回的缓冲区或此缓冲区的内容会影响彼此的内容，他们维护单独的index和makers，此方法不会修改原始缓冲区的readerIndex或writerIndex。 @Override public ByteBuf slice() { return slice(readerIndex, readableBytes()); } @Override public ByteBuf slice(int index, int length) { ensureAccessible(); return new UnpooledSlicedByteBuf(this, index, length); } boolean release0() { return unwrap().release(); } public static void main(String[] args) throws Exception { PooledByteBufAllocator allocator = PooledByteBufAllocator.DEFAULT;

Format yyymmdd date

由 回眸只為那壹抹淺笑 提交于 2019-12-13 08:34:59
问题 I need this javascript function to not split a yyyy-mm-dd but split a yyymmdd. Current date formats are 2011-11-02 but this function needs to work with 20111102. Script: function evaluateEventDate(eventdate, date){ var eventdate = eventdate.split('-'); var date = date.split('-'); if (eventdate[0] === 'yyyy') { eventdate[0] = date[0]; } if (eventdate[1] === 'mm') { eventdate[1] = date[1]; } if (eventdate[2] === 'dd') { eventdate[2] = date[2]; } return eventdate[0]+'-'+eventdate[1]+'-'

Laravel slice collection after an element

由 笑着哭i 提交于 2019-12-13 06:11:10
问题 So I have this Model, which am going to name Clients Clients has id int PK name varchar phone int city varchar active tinyint I chose this way to get the phone numbers grouped by cities return Clients::select('name','phone','city')->selectSub('lpad(phone,1,'0'))->where('active',1)->groupBy('city')->paginate(10); I want to slice the collection to a sub collection from a certain client, in other terms, if I have the following output : John 0123456 Paris Jake 0255664 Montreal Jane 0165656 London

$slice mongoDB Java

由 泪湿孤枕 提交于 2019-12-13 04:52:23
问题 How can I make this query in Java db.comments.find({ "hsID.$id" { "$oid" : "4fe71a50e7e9f22ae5fb96bf"}} , {commentList: { $slice : [ 2 , 2]}}); This the code I am doing BasicDBObject query = new BasicDBObject(); BasicDBObject allFields = new BasicDBObject(); ObjectId objectId = new ObjectId(objId); query.put("{hsID.$id", objectId); Integer[] sliceInt = { startIndex, pageSize }; query.put( "commentList", new BasicDBObject().append("$slice", sliceInt)); DBCursor resultsCursor = CommentColl.find
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