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# representing 8 bits per element

Asked by FIR on 27 Dec 2012

In the previous post

walters comment

Remember, comp is representing binary, and so is 1 bit per element, whereas your original data is at least 8 bits per element.

now how to represent binary element as 8 bits per element

binary values are stored in comp

## 1 Comment

Image Analyst on 27 Dec 2012

Why wasn't this posted in that previous post then? Why did you start a whole new discussion?

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Answer by Walter Roberson on 27 Dec 2012

Provided your vector comp is an exact multiple of 8 long:

```x = comp;  %just to make the writing shorter
```
```uint8( x(1:8:end) * 128 + x(2:8:end) * 64 + x(3:8:end) * 32 + x(4:8:end) * 16 + x(5:8:end) * 8 + x(6:8:end) * 4 + x(7:8:end) * 2 + x(8:8:end) )
```

FIR on 27 Dec 2012

walter every time the size is varying

Walter Roberson on 27 Dec 2012
```while length(x) ~= 8 * floor(length(x)/8)
x(end+1) = 0;
end
```
FIR on 27 Dec 2012

thanks a lot