Yogesh Chauhan's Blog

# ABS and NEG functions in Envision Basic

in Envision Basic on December 25, 2021

In Envision basic, there are many useful functions that comes handy. Especially when performing some quick mathematical operations, it saves us a few lines of code.

ABS and NEG are a couple of those kinds of functions that comes handy for math operations.

These functions are really easy to use and mostly don’t require any complex logic to use them.

## ABS Function

The ABS function is nothing but an absolute value function. It returns the positive numeric value of the
argument.

### Syntax

``````
ABS(expr)
```
```

### Example

This will change X.NUMBER variable’s value to a positive 1 from a negative 1.

``````
X.NUMBER = -1
X.NUMBER = ABS(X.NUMBER)
```
```

## NEG Function

The NEG function changes the value of the passes numeric value to the opposite sign value.

So, if the passes expression is of a positive value, it’ll change it to a negative value and return it.

If the passes expression is of a negative value, it’ll change it to a positive value and return it.

### Syntax

``````
NEG(expr)
```
```

### Example

This will change X.NUMBER variable’s value to a positive 1 from a negative 1.

``````
X.NUMBER = -1
X.NUMBER = NEG(X.NUMBER)
```
```

This will change X.NUMBER variable’s value to a negative 1 from a positive 1.

``````
X.NUMBER = 1
X.NUMBER = NEG(X.NUMBER)
```
```