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

Ted

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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.

Examples

 v = 5;
 n = 3;

then return v1:

 v1 = [5 5 5]

If a 2d matrix is supplied then the vector v will be the first column.

 V = magic(4);
 n = 4;

then v and v1 are returned as shown below.

 v = [16 5 9 4]'
 v1 = [16 16 16 16; 5 5 5 5; 9 9 9 9; 4 4 4 4]

Hint: use indexing

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Last Solution submitted on Apr 02, 2026

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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

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