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# how to resize a given signal?

Asked by Sivakumaran Chandrasekaran on 25 Mar 2013

how to resize a given signal? My input signals are y2=[ 1 9385];yh=[1 37508]; I need to find y2+y5.

Azzi Abdelmalek on 25 Mar 2013

What is y5?

Walter Roberson on 25 Mar 2013

Do the signals occupy exactly the same time duration ?

## Products

Answer by Image Analyst on 27 Mar 2013
Edited by Image Analyst on 27 Mar 2013

You'll probably want to use either interp1() or imresize(). Both are illustrated in the demo below:

```clc;
clearvars;
y2 = rand(1, 9385);
y5 = rand(1, 37508);
```
```% The easiest method, using imresize().
% Make y2 the same size as y5
y2Larger = imresize(y2, size(y5));
% Now sum them
output = y2Larger + y5;
```
```% Alternative method using interp1
x = linspace(1, length(y5), length(y2));
xi = 1:length(y5);
y2Larger  = interp1(x, y2, xi)
% Now sum them
output = y2Larger + y5;
```

Answer by Ahmed A. Selman on 27 Mar 2013

Use reshape

```Y=function(X,m,n)
```

It works for any input matrix (X) with number of elements (m x n). The output is Y with m-rows by n-columns. The size of X and Y must be the same.