Replicate and tile an array so that it meets a specified final size.
Updated 21 Oct 2010

View License

repToSize is an adaptation of repmat which requires only the final array size as the input. This removes the need to calculate the number of repetitions as well as handling for cases where a a fractional number of repetitions is required.

If the final
size is not a multiple of the original array's size, the appropriate partition
of the array will be used to fill the remaining values.

In pictoral form for the 2D case:

If A = [m x n array], then
B = repToSize(A,x,y) produces
| A A .. A A2 |
| A A .. A A2 |
| .. .. .. .. .. |
| A A .. A A2 |
| A1 A1 .. A1 A3 |
where x >= m, y >= n, and
A1 = A(1:rem(x,m),:)
A2 = A(:,1:rem(y,n))
A3 = A(1:rem(x,m),1:rem(y,n))

If, for example, x < m and y < n, then B will simply be equal to A3.

A = reshape([1:3*4*5],[3 4 5]); % a 3x4x5 array of values from 1 to 60
B = repToSize(A,[13 19 3]) % create a 13 x 19 x 3 array, replicating values
B = repToSize(A,13,19,3) % alternate syntax

In this example, B(:,1,:) will contain repeated copies of [1;2;3] with a 1
as the final entry (13 is not a multiple of 3). B(1,:,:) will
contain repeated copies of [1,4,7,10], ending in 7 as the last entry in the
row (19 is not a multiple of 4).

Cite As

Jason Kaeding (2024). repToSize (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2010b
Compatible with any release
Platform Compatibility
Windows macOS Linux
Find more on Numeric Types in Help Center and MATLAB Answers

Community Treasure Hunt

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

Start Hunting!
Version Published Release Notes