# Element by Element Division

Element by element division (the dot division) `./`

works differently from Array multiplication `/`

be careful not to confuse the two.

**Division of Scalars**

When we looked at subtraction we seen that 6 pens were used. If this is over a period of 3 months, we may want to know the amount of pens used each month so we can make a monthly order. To do this we can use division.

`6 pens ./ 3 months = 6/3 pens/month = 2 pens/month`

i.e. we see that 2 pens are used per month.

To write this in MATLAB we would use

`6./3`

Note for a 1 by 1 scalar array division and element by element division are identical.

**(Dot Division) of a Column Vector**

If 6 pens and 3 pads were used up in 3 months then

i.e. we see that 2 pens and 1 pad are used per month.

To write this in MATLAB we would use

`[6;3]./[3;3]`

**(Dot Division) of Matrices**

If the man in the red house used 6 pens and 2 pads up in a period of 3 months and the women in the green house used up 8 pens and 6 pads in a period of 4 months then

i.e. we see that the man uses 2 pens and 1 pad per month and the woman also uses 2 pens and 1 pad per month.

To write this in MATLAB we would use

`[6,8;3,4]./[3,4;3,4]`