# Complex.Subtract Method (Complex, Complex)

.NET Framework (current version)

Subtracts one complex number from another and returns the result.

Namespace:   System.Numerics
Assembly:  System.Numerics (in System.Numerics.dll)

## Syntax

```Public Shared Function Subtract (
left As Complex,
right As Complex
) As Complex
```

#### Parameters

left
Type: System.Numerics.Complex

The value to subtract from (the minuend).

right
Type: System.Numerics.Complex

The value to subtract (the subtrahend).

#### Return Value

Type: System.Numerics.Complex

The result of subtracting right from left.

## Remarks

The subtraction of a complex number, c + di, from another complex number, a + bi, takes the following form:

(a - c) + (b - d)i

If the method call results in an overflow in either the real or imaginary component, the value of that component is either Double.PositiveInfinity or Double.NegativeInfinity.

Languages that do not support custom operators can use the Subtract method to perform subtraction using complex numbers.

## Examples

The following example subtracts each complex number in an array from a complex number.

```Imports System.Numerics

Module Example
Public Sub Main()
Dim c1 As New Complex(4.93, 6.87)
Dim values() As Complex = { New Complex(12.5, 9.6),
New Complex(4.3, -8.1),
New Complex(-1.9, 7.4),
New Complex(-5.3, -6.6) }

For Each c2 In values
Console.WriteLine("{0} - {1} = {2}", c1, c2,
Complex.Subtract(c1, c2))
Next
End Sub
End Module
' The example displays the following output:
'       (4.93, 6.87) - (12.5, 9.6) = (-7.57, -2.73)
'       (4.93, 6.87) - (4.3, -8.1) = (0.63, 14.97)
'       (4.93, 6.87) - (-1.9, 7.4) = (6.83, -0.53)
'       (4.93, 6.87) - (-5.3, -6.6) = (10.23, 13.47)
```

## Version Information

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone
Available since 8.1