R: Complex Root Finding

fzsolve {pracma} | R Documentation

## Complex Root Finding

### Description

Find the root of a complex function

### Usage

    fzsolve(fz, z0)

### Arguments

`fz` | complex(-analytic) function.
`z0` | complex point near the assumed root.

### Details

`fzsolve` tries to find the root of the complex and relatively smooth (i.e., analytic) function near a starting point.

The function is considered as real function `R^2 --> R^2` and the `newtonsys` function is applied.

### Value

Complex point with sufficiently small function value.

### See Also

`newtonsys`

### Examples

    fz <- function(z) sin(z)^2 + sqrt(z) - log(z)
    fzsolve(fz, 1+1i)
    # 0.2555197+0.8948303i

[Package pracma version 2.0.4 Index]