# R - signif() Function

The R signif() function rounds the values in its first argument to the specified number of significant digits. In special cases it returns the following:

• If the argument is NaN or infinity, then the result is the same as the argument.

### Syntax

```signif(x, digits)
```

### Parameters

 `x` `Required. `Specify column to round off. `digits` `Optional. `Specify number of significant digits to which value has to be round off.

### Return Value

Returns the integral value that is nearest to the argument value.

### Example: Rounding off the values

In the example below, signif() function is used to round the specified number.

```#operating on single element atomic vector
print(signif(-1))
print(signif(0.5))
print(signif(2.0))

cat("\nOperating on vector\n")
#operating on vector
v <- c(10.3, 10.5, 10.75, -10.375, -10.5, -10.7)
print(signif(v))

cat("\nOperating on matrix\n")
#operating on matrix
m <- matrix(c(-10.375, -10.5, -10.7, 100.241, Inf, NaN), nrow=2)
print(signif(m))

cat("\nOperating on first column of matrix\n")
#operating on first column of matrix
print(signif(m[,1]))
```

The output of the above code will be:

``` -1
 0.5
 2

Operating on vector
  10.300  10.500  10.750 -10.375 -10.500 -10.700

Operating on matrix
[,1]    [,2] [,3]
[1,] -10.375 -10.700  Inf
[2,] -10.500 100.241  NaN

Operating on first column of matrix
 -10.375 -10.500
```

### Example: Rounding off to certain significant digits

Consider one more example where a numeric vector is rounded off to 3 significant digits.

```#creating a vector
v <- c(10.33333, 10.567, 10.7, -10.35, -10.534, 10/3)

#printing the vector after rounding
#off to 3 significant digits
print(signif(v, 3))
```

The output of the above code will be:

```  10.30  10.60  10.70 -10.40 -10.50   3.33
```

❮ R Math Functions

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