Subtraction of rows in matrices

Hi All, Hope you can help

I have a 2x5000 matrix and I want to subtract the first row from the second row.

I have tried vectorising them but it isn't working

For example dn=[1 2 4 5 6 7 7 
                3 5 6 7 8 9 9]

i want to subtract the first row from the second.

Any ideas how i can do this without vecotirsing each row?

Thanks

Answer 1

[Stephen23]

>> diff(dn)
ans =
   2   3   2   2   2   2   2

[Serena Solanki]

Ah thank you !

Answer 2

[Star Strider]

I do not know what you mean by ‘vectorize’.

Regardless, use the diff funciton:

dn=[1 2 4 5 6 7 7
    3 5 6 7 8 9 9]

Result = diff(dn)

Result =
     2     3     2     2     2     2     2