**DEC** __Variable__

Decrements a variable.

__Variable__ can be any target of an assignment, but must be numeric.

It is the exact equivalent of

__Variable__ = __Variable__ - 1

or

__Variable__ -= 1

X=7DecX

```
6
```

DimAAsFloat[3,3]X=2Y=1A[X,Y]=PiDecA[X,Y][X,Y]

```
2.14159265359
```