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## igeo
Class IMatrix2

    java.lang.Object
      igeo.IMatrix
          igeo.IMatrix2

All Implemented Interfaces:
  IMatrix2I, IMatrix2Op, IMatrixI, IMatrixOp, IParameter, IVal

    public class IMatrix2

extends IMatrix
implements IMatrix2I

Class of 2x2 numerical matrix.

Author:
  Satoru Sugihara

Field Summary

Fields inherited from class igeo.IMatrix
`columnNum, rowNum, val`

Constructor Summary
`IMatrix2()`
`IMatrix2(double v11, double v12, double v21, double v22)`
`IMatrix2(IMatrix2 m)`

Method Summary
`IMatrix2` | `cp()` alias of dup()
`double` | `determinant()`
`IMatrix2` | `dup()`
`IMatrix2` | `get()`
`static IMatrix2` | `getRotation(double angle)`
`IMatrix2` | `invert()`
`IMatrix2` | `mul(IMatrix2 m)` m is applied from right side and update the content of this without creating new instance.
`IMatrix2` | `mul(IMatrix2I m)`
`IVec2` | `mul(IVec2 v)` vector is treated as vertical vector
`IVec2` | `mul(IVec2I v)` vector is treated as vertical vector
`IMatrix2` | `set(double v11, double v12, double v21, double v22)`
`IMatrix2` | `set(IDoubleI v11, IDoubleI v12, IDoubleI v21, IDoubleI v22)`

Methods inherited from class igeo.IMatrix
`add, add, columnNum, columnNum, columnNum, det, determinant, determinant, div, div, get, get, get, id, mul, mul, mul, mul, rowNum, rowNum, rowNum, set, set, set, set, set, set, setId, setRange, setZero, sub, sub, toArray, toArray, toString, zero`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Methods inherited from interface igeo.IMatrixI
`add, columnNum, columnNum, columnNum, determinant, determinant, div, div, get, get, get, mul, mul, mul, rowNum, rowNum, rowNum, set, set, set, set, set, setId, setZero, sub`

Constructor Detail

### IMatrix2

    public IMatrix2()

### IMatrix2

    public IMatrix2(double v11,
                    double v12,
                    double v21,
                    double v22)

### IMatrix2

    public IMatrix2(IMatrix2 m)

Method Detail

### get

    public IMatrix2 get()

  Specified by:
    `get` in interface `IMatrix2I`
  Specified by:
    `get` in interface `IMatrix2Op`
  Specified by:
    `get` in interface `IMatrixOp`
  Specified by:
    `get` in interface `IParameter`
  Overrides:
    `get` in class `IMatrix`

### set

    public IMatrix2 set(double v11,
                        double v12,
                        double v21,
                        double v22)

  Specified by:
    `set` in interface `IMatrix2I`

### set

    public IMatrix2 set(IDoubleI v11,
                        IDoubleI v12,
                        IDoubleI v21,
                        IDoubleI v22)

  Specified by:
    `set` in interface `IMatrix2I`

### dup

    public IMatrix2 dup()

  Specified by:
    `dup` in interface `IMatrix2I`
  Specified by:
    `dup` in interface `IMatrixI`
  Overrides:
    `dup` in class `IMatrix`

### cp

    public IMatrix2 cp()

  Description copied from interface: `IMatrixI`
  alias of dup()

  Specified by:
    `cp` in interface `IMatrix2I`
  Specified by:
    `cp` in interface `IMatrixI`
  Overrides:
    `cp` in class `IMatrix`

### determinant

    public double determinant()

  Specified by:
    `determinant` in interface `IMatrixI`
  Overrides:
    `determinant` in class `IMatrix`

### invert

    public IMatrix2 invert()

  Specified by:
    `invert` in interface `IMatrixI`
  Overrides:
    `invert` in class `IMatrix`

### mul

    public IMatrix2 mul(IMatrix2 m)

  m is applied from right side and update the content of this without creating new instance. it returns itself.

### mul

    public IMatrix2 mul(IMatrix2I m)

  Specified by:
    `mul` in interface `IMatrix2I`

### mul

    public IVec2 mul(IVec2I v)

  vector is treated as vertical vector

  Specified by:
    `mul` in interface `IMatrix2I`

### mul

    public IVec2 mul(IVec2 v)

  vector is treated as vertical vector

### getRotation

    public static IMatrix2 getRotation(double angle)

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