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2
3# Function expm1
4
5Calculate the value of subtracting 1 from the exponential value.
6For matrices, the function is evaluated element wise.
7
8
9## Syntax
10
11```js
12math.expm1(x)
13```
14
15### Parameters
16
17Parameter | Type | Description
18--------- | ---- | -----------
19`x` | number &#124; BigNumber &#124; Complex &#124; Array &#124; Matrix | A number or matrix to apply expm1
20
21### Returns
22
23Type | Description
24---- | -----------
25number &#124; BigNumber &#124; Complex &#124; Array &#124; Matrix | Exponent of `x`
26
27
28## Examples
29
30```js
31math.expm1(2) // returns number 6.38905609893065
32math.pow(math.e, 2) - 1 // returns number 6.3890560989306495
33math.log(math.expm1(2) + 1) // returns number 2
34
35math.expm1([1, 2, 3])
36// returns Array [
37// 1.718281828459045,
38// 6.3890560989306495,
39// 19.085536923187668
40// ]
41```
42
43
44## See also
45
46[exp](exp.md),
47[log](log.md),
48[pow](pow.md)