This is the information that i can find http://help.solidworks.com/2017/english/SolidWorks/motionstudies/c_Supported_Functions_SWMotion.htm?id=b99ae5cf38bb4a3d9bb8c273c9c914e8#Pg0&ProductType=&ProductName=

2017 SOLIDWORKS Help - Supported Functions

but it will be great to have some examples with their respective graphs, i see that there is some kind of logic like the IF function but doesnt seems clear to me.

for example i would like to build a function like this :

so i can modify the values of frequency and time and then update  intermitent custom movements.