Given a stream of updates about items drawn from a universe {1,...,n}, the stream's fre-quency vector f e R" is the vector whose i'th component fi equals the frequency of item iin the stream. For example, for the stream ((add, 5), (add, 7), (add, 5), (add, 7), (delete, 7))with universe {1,...,7}, its frequency vector is (0,0,0,0, 2, 0, 1).A streaming algorithm is said to maintain a linear sketch of size k if it stores in memory' Aƒfor a matrix A e R**n that is fixed at the initialization.(a) Show that the algorithm discussed in class for frequency estimation is a linear sketch.What is the matrix A in this case?(b) Suppose a streaming algorithm is a linear sketch. Assume the matrix A mentionedabove is explicitly known to the algorithm. Explain how the algorithm should updateits storage each time a stream update comes of the form (add, i) or (delete, i).

Answered: Given a stream of updates about items…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

See similar textbooks

Similar questions

Given a list mylist construct a dictionary mydict, the key is the index of an element in my list and its value will be the element value of mylist. for example the index of "a" is "0" . therefore the pair ( 0,"a" )will be in mydict .it means mydict = { 0:'a' ,1:'cybersecurity ', 2 : 'newyork'......} Do this in coding but not manually. given an empty dictionary mydict ={} write a python code to construct mydict for any given list. Hint : Your Code begins with mydict={}for val in mylist:
You are given a 0-indexed integer array nums and a target element target. A target index is an index i such that nums [i] target. == Return a list of the target indices of nums after sorting nums in non-decreasing order. If there are no target indices, return an empty list. The returned list must be sorted in increasing order. vector targetIndices(vector& nums, int target) { //write your code here } Example 1: Input: nums = [1,2,5,2,3], target = 2 Output: [1,2] Explanation: After sorting, nums is [1,2,2,3,5]. The indices where nums[i] == 2 are 1 and 2.
Do not use AI...
Slicing a vector function [subvector] = myVectorSlice (myVector, i, j) Description A 1xN row vector. A start index. An end index. Description A slice of the vector with element from the ith index to the jth index. Input myVector i j Output subvector subvector = Type 1xN double 1x1 int 1x1 int Type 1x (j-i+1) double Details Slicing a vector in MATLAB means taking elements from one given index to another given index (including both the ith element and the jth element) in a vector. For example, if we define myVector = [1 2 3 4 5 6 7] then, >> subvector = myVectorSlice (myVector, 1, 2) subvector = 12 >> subvector = myVectorSlice (myVector, 2, 5) 2 3 4 5 My S Tips ▪ You can assume that i and jare within bounds and i ≤j.
A student record system uses an ArrayList object called studrecs tomaintain a collection of student details where each student is anobject defined by the Student class. The student class has accessormethods getName() and getRegNo() 1. Write a for-each loop that iterates through the studrecs collectionwriting out each student’s name and registration number. 2. In general, how many times does a for-each loop iterate? 3. Write the code for a while loop to iterate through the studrecscollection writing out each student’s name and registration number. 4. Write the code for an Iterator to loop through the studrecs collectionwriting out each student’s name and registration number.
1. Consider a sequence of requests for service at the new Mount Union Print Shop. Each request that arrives will be identified by the name of the requesting person. If we use a queue of Objects to hold the requests in arrival order until they can be removed from the queue and serviced, draw a picture of the queue after execution of this example sequence that clearly shows the front and rear of the queue in an array of 8 elements. /* 4 points */. Name Request or Release? Bruce request request serviced request request serviced Gloria Bruce Tammy Lucas Gloria request request Tina
Given a data set x, the following R commands have been run: library(cluster); agnes (x=X)->AG; KKM Match the following objects with what you expect the R output to be. AG$height AG$order KM$cluster KM$betweenss KM$tot.withinss KM$totss KM$withinss Choose... Choose... Choose... Choose... Choose... Choose... Choose... ◆ ◆ ◆ → ◆ ◆ ◆
Slicing a vector function [subvector] = myVectorSlice (myVector, i, j) Description A 1xN row vector. A start index. An end index. Description A slice of the vector with element from the ith index to the jth index. Input myVector i j Output subvector subvector = Type 1xN double 1x1 int 1x1 int Type 1x (j-i+1) double Details Slicing a vector in MATLAB means taking elements from one given index to another given index (including both the ith element and the jth element) in a vector. For example, if we define myVector = [1 2 3 4 5 6 7] then, >> subvector = myVectorSlice (myVector, 1, 2) subvector = 12 >> subvector = myVectorSlice (myVector, 2, 5) 2 3 4 5 My S Tips ▪ You can assume that i and jare within bounds and i ≤j.
Put the records into a nested list - Each individual record consists of 3 pieces of information, each coming from one of the 3 consecutive lines in the text file. - Each record is a 3-element lists and all records would themselves be list elements, i.e. you would have a (nested) list of lists holding all your data: arecord = [ <id>, <date>, <title>] records_list = [ <first record>, <second record>, …, <last record> ] - you will need to use a loop here.
Need answer within 30 minutes. Provide outuput also
The Burrows-Wheeler transform (BWT) is a transformation that is used in data compression algorithms, including bzip2, and in high-throughput sequencing in genomics. Write a SuffixArray client that computes the BWT in linear time, as follows: Given a string of length N (terminated by a special end-of-file character $ that is smaller than any other character), consider the N-by-N matrix in which each row contains a different cyclic rotation of the original text string. Sort the rows lexicographically. The Burrows-Wheeler transform is the rightmost column in the sorted matrix. For example, the BWT of Mississippi is ipssm$pissii. The Burrows-Wheeler inverse transform (BWI) inverts the BWT. For example, the BWI of ipssm$pissii is mississippi$. Also write a client that, given the BWT of a text string, computes the BWI in linear time.

Recommended textbooks for you

Database System Concepts

Computer Science

ISBN:

9780078022159

Author:

Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:

McGraw-Hill Education

Starting Out with Python (4th Edition)

Computer Science

ISBN:

9780134444321

Author:

Tony Gaddis

Publisher:

PEARSON

Digital Fundamentals (11th Edition)

Computer Science

ISBN:

9780132737968

Author:

Thomas L. Floyd

Publisher:

PEARSON

Database System Concepts

Computer Science

ISBN:

9780078022159

Author:

Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:

McGraw-Hill Education

Starting Out with Python (4th Edition)

Computer Science

ISBN:

9780134444321

Author:

Tony Gaddis

Publisher:

PEARSON

Digital Fundamentals (11th Edition)

Computer Science

ISBN:

9780132737968

Author:

Thomas L. Floyd

Publisher:

PEARSON

C How to Program (8th Edition)

Computer Science

ISBN:

9780133976892

Author:

Paul J. Deitel, Harvey Deitel

Publisher:

PEARSON

Database Systems: Design, Implementation, & Manag…

Computer Science

ISBN:

9781337627900

Author:

Carlos Coronel, Steven Morris

Publisher:

Cengage Learning

Programmable Logic Controllers

Computer Science

ISBN:

9780073373843

Author:

Frank D. Petruzella

Publisher:

McGraw-Hill Education

SEE MORE TEXTBOOKS