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# How to multiply the following?

Considering an image I of any size. A mask of size 1X10. How to multiply those two?

a.*b... Most probably it should work

Sabarinathan Vadivelu on 10 Sep 2012

I'm getting error

```??? Error using ==> times
Integers can only be combined with integers of the same class, or scalar doubles.
```
Jan Simon on 10 Sep 2012

You cannot multiply a [MxNx3] array directly by a [1x10] vector. It is not clear what kind of output you expect for such a calculation.

## Products

Answer by Titus Edelhofer on 10 Sep 2012

Hi,

```dblImage = double(yourImage);
```

Otherwise you might try to convert your mask to the same integer type as your image (by using uint8, ...).

Titus

Jan Simon on 10 Sep 2012

Please post the relevant part of your code. Without the code and without an exact copy of the error message, we can only guess what's going on.

Sabarinathan Vadivelu on 10 Sep 2012

This is my code. deg0 is 1X10 mask. threshImage is the input Image.

```for i=1:10
deg0(i) = 0.25;
end
deg0=cast(deg0,'uint8');
[rows columns] = size(threshImage);
for j = 1 : columns
for i= 1 : 10 : rows
filtImage0(i,j) = threshImage(i,j).*deg0;
end
end
```
Titus Edelhofer on 10 Sep 2012

Hi,

if you do it by loop, you need to index deg0 as well:

```filtImage0(i,j) = threshImage(i,j).*deg0(i);
```

or

```filtImage0(i,j) = threshImage(i,j).*deg0(j);
```

Titus