## 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`

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