bar chart

[cedfoning]

Hello, i have an issue : 

i have this bar chart : 

I want to have a dynamic title as follow : 
i have a filter [Position]. 

if no selection/all positions selected, then "all",

if several positions selected, then number of selected/total number,

if one position only, then the position name

@rwunderlich @Taoufiq_Zarra @sunny_talwar 

[anat]

if(GetSelectedcount(field)=count({1} distinct field)or getselectedcount(field)=0,'All',getfieldselection(field))

[brunobertels]

hi may be somethink like this : 

if(getselectedcount(Position)=0,'ALL' ,

if(getselectedcount(Position)=1, GetCurrentSelections (),

if(getselectedcount(Position)>1, GetSelectedCount (Position) / (GetAlternativeCount ([Position) +GetSelectedCount (Position))

)))