Problem 2012. Tony's trick for duplicating an mx1 vector n times

Created by Ted

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","targetMode":"","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","targetMode":"","relationshipId":"rId2","target":"/matlab/output.xml"}],"parts":[{"partUri":"/matlab/document.xml","relationship":[],"contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Without using repmat, or for loop, or concatenation, create a function to duplicate a vector, v, a specified number of times, n. v can be numeric or character. n may be 0.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Examples</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>If</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ v = 5;\n n = 3;]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>then return v1:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ v1 = [5 5 5]]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>If a 2d matrix is supplied then the vector v will be the first column.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ V = magic(4);\n n = 4;]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>then v and v1 are returned as shown below.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ v = [16 5 9 4]'\n v1 = [16 16 16 16; 5 5 5 5; 9 9 9 9; 4 4 4 4]]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Hint: use indexing</w:t></w:r></w:p></w:body></w:document>"},{"partUri":"/matlab/output.xml","contentType":"text/xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?><embeddedOutputs><metaData><evaluationState>manual</evaluationState><layoutState>code</layoutState><outputStatus>ready</outputStatus></metaData><outputArray type=\"array\"/><regionArray type=\"array\"/></embeddedOutputs>"}]}

Solve

Solution Stats

88 Solutions
32 Solvers

Last Solution submitted on Aug 30, 2020

Last 200 Solutions

Problem Comments

2 Comments

2 Comments

James on 27 Nov 2013

When did the functionality of linspace change to give an empty 1-by-0 matrix for n=0? My version is very old (R14, SP3 from 2005), and the command "linspace(1,1,0)" gives 1. Just curious.

Ted on 29 Nov 2013

hi - not sure, but it is similar in behaviour to ones(1,0), nan(1,0) etc

Problem Recent Solvers32

Problem Tags

duplicating vectors indexing

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Problem 2012. Tony's trick for duplicating an mx1 vector n times

Solution Stats

Last 200 Solutions

Problem Comments

Problem Recent Solvers32

Suggested Problems

More from this Author11

Problem Tags

Community Treasure Hunt

Problem 2012. Tony's trick for duplicating an mx1 vector n times

Solution Stats

Last 200 Solutions

Problem Comments

Problem Recent Solvers32

Suggested Problems

More from this Author11

Problem Tags

Community Treasure Hunt

Players