# Math Help - excel piecewise functions

1. ## excel piecewise functions

hey is there any way of making a piecewise function on excel without the use of 3rd party products?
i want to add two linear trend line to different parts of my data

2. Originally Posted by luysion
hey is there any way of making a piecewise function on excel without the use of 3rd party products?
i want to add two linear trend line to different parts of my data
See if this google hit helps, scroll a couple of pages down:

http://faculty.mc3.edu/whunter/excel...0FUNCTIONS.doc

3. Originally Posted by luysion
hey is there any way of making a piecewise function on excel without the use of 3rd party products?
i want to add two linear trend line to different parts of my data
Check out the IF function.

For example, if you want

$f(x) = 2x+3 \text{ if } x < 3$
$= 3x-8$ otherwise,

and x is in cell A1, then the function would be

=IF(A1<3, 2*A1+3, 3*A1-8)