# sinpi

Computes sin(X \* pi) accurately.

## Syntax

* res = sinpi(x)

## Input argument

* x - a numeric value

## Output argument

* res - a numeric value

## Description

**res = sinpi(x)** computes **sin(x \* pi)** accurately.

For odd integers, **sinpi(x / 2)** is +1 or -1.

For integers, **sinpi(x)** is exactly zero.

## Example

```matlab
x = [0, 1/2, 1, 3/2, 2];
r = sin(x * pi)
res = sinpi(x)
```

## See also

[sin](sin), [cospi](cospi).

## History

| Version | Description     |
| ------- | --------------- |
| 1.0.0   | initial version |

## Author

Allan CORNET
