if-statement: IF "OR" multiple conditions

jeudi 5 février 2015

I have a standard 2x2 table


      Yes   No
Yes    a    b
No     c    d

I want to create a condition whereby IF(a or b or c or d = 0) then 0.5 is added on to each of the cells a,b,c,d.

I have tried this:


  if(a && b && c && d == 0){
    a=a+0.5, b=b+0.5, c=c+0.5, d=d+0.5
  }

But I am getting an error saying


Error: unexpected ',' in:
"if(a && b && c && d== 0){
a=a+0.5,"

i.e. I don't think it is letting me put multiple things to execute.

Also I don't think that the && is right between each of the letters as I believe that means IF(a and b and ...)

if-statement