# tensorplay.functional.polar

Source: https://www.tensorplay.cn/docs/generated/tensorplay.functional.polar.html

```python
tensorplay.functional.polar(abs, angle, *, out=None) → Tensor
```

Constructs a complex tensor whose elements are Cartesian coordinates
corresponding to the polar coordinates with absolute value [abs](/docs/generated/tensorplay.functional.abs.html#tensorplay.functional.abs) and angle
[angle](/docs/generated/tensorplay.functional.angle.html#tensorplay.functional.angle).

$$\text{out} = \text{abs} \cdot \cos(\text{angle}) + \text{abs} \cdot \sin(\text{angle}) \cdot j$$

> **Note**
>
> tensorplay.polar is similar to std::polar and does not compute the polar decomposition of a complex tensor like Python’s cmath.polar and SciPy’s linalg.polar do. The behavior of this function is undefined if abs is negative or NaN, or if angle is infinite.

Parameters:

- abs ([Tensor](/docs/generated/tensorplay.Tensor.html#tensorplay.Tensor)) – The absolute value the complex tensor. Must be float or double.

- angle ([Tensor](/docs/generated/tensorplay.Tensor.html#tensorplay.Tensor)) – The angle of the complex tensor. Must be same dtype as [abs](/docs/generated/tensorplay.functional.abs.html#tensorplay.functional.abs).

Keyword Arguments:

out ([Tensor](/docs/generated/tensorplay.Tensor.html#tensorplay.Tensor)) – If the inputs are tensorplay.float32, must be
tensorplay.complex64. If the inputs are tensorplay.float64, must be
tensorplay.complex128.

Example:

```
>>> import numpy as np
>>> abs = tensorplay.tensor([1, 2], dtype=tensorplay.float64)
>>> angle = tensorplay.tensor([np.pi / 2, 5 * np.pi / 4], dtype=tensorplay.float64)
>>> z = tensorplay.polar(abs, angle)
>>> z
tensor([(0.0000+1.0000j), (-1.4142-1.4142j)], dtype=tensorplay.complex128)
```