# cwtpolar: Conversion to Polar Coordinates In Rwave: Time-Frequency Analysis of 1-D Signals

## Description

Converts one of the possible outputs of the function `cwt` to modulus and phase.

## Usage

 `1` ```cwtpolar(cwt, threshold=0) ```

## Arguments

 `cwt` 3D array containing the values of a continuous wavelet transform in the format (signal size x noctave x nvoice) as in the output of the function `cwt` with the logical flag `twodimension` set to FALSE. `threshold` value of a level for the absolute value of the modulus below which the value of the argument of the output is set to -pi.

## Details

The output contains the (complex) values of the wavelet transform of the input signal. The format of the output can be

2D array (signal size x nb\_scales)

3D array (signal size x noctave x nvoice)

## Value

Modulus and Argument of the values of the continuous wavelet transform

 `output1` 3D array giving the values (in the same format as the input) of the modulus of the input. `output2` 3D array giving the values of the argument of the input.

## References

See discussions in the text of “Practical Time-Frequency Analysis”.

## See Also

`cwt`, `DOG`, `cwtimage`.

## Examples

 ```1 2 3 4``` ``` x <- 1:512 chirp <- sin(2*pi * (x + 0.002 * (x-256)^2 ) / 16) retChirp <- cwt(chirp, noctave=5, nvoice=12, twoD=FALSE, plot=FALSE) retPolar <- cwtpolar(retChirp) ```

### Example output

```
```

Rwave documentation built on May 2, 2019, 9:15 a.m.