IF Condition in Wolfram Mathematica The syntax is as follows xxxxxxxxxx If [ condition ,  what  to  do  if  true ,  what  to  do  if  false ] Some examples Example 1. Simple command x x  =  - 3 ; If [ x < 0 ,  - x ,  x ] 3 Example 2. If condition in a function abs [ x_ ] := If [ x < 0 ,  - x ,  x ] abs /@ { - 3 ,  2 ,  0 ,  - 2 } { 3 ,  2 ,  0 ,  2 }   For in Wolfram Mathematica The syntax is as follows For [ start ,  test ,  inc ,  what  to  do ] Some examples Example 1. Simple Loop xxxxxxxxxx For [ i = 0 ,  i < 4 ,  i ++,  Print [ i ]] 0 1 2 3 Example 2. Another simple loop For [ i = 10 ,  i > 0 ,  i --,  Print [ i ]] 10 9 8 7 6 5 4 3 2 1 Example 3. Print list a = { 10 ,  3 ,  9 ,  2 } For [ i = 1 , i < 5 , i ++, Print [ a [[ i ]]]] 10 3 9 2