java.lang.Object
- org.meteoinfo.ndarray.MAMath

```
public class MAMath
extends java.lang.Object
```
Element by element algebra on Arrays

作者:

caron

另请参阅:

Index

嵌套类概要

嵌套类
修饰符和类型类说明

static class MAMath.MinMax
Holds a minimum and maximum value.

static class MAMath.ScaleOffset
Holds a scale and offset.

构造器概要

构造器
构造器说明

MAMath()

方法概要

所有方法静态方法具体方法
修饰符和类型	方法	说明
`static Array`	`add(Array a, Array b)`	Add elements of two arrays together, allocating the result array.
`static void`	`addDouble(Array result, Array a, Array b)`	Add elements of two arrays together as doubles, place sum in the result array.
`static MAMath.ScaleOffset`	`calcScaleOffsetSkipMissingData(Array a, double missingValue, int nbits, boolean isUnsigned)`	Calculate the scale/offset for an array of numbers.
`static boolean`	`conformable(int[] shapeA, int[] shapeB)`	Check that two array shapes are conformable.
`static boolean`	`conformable(Array a, Array b)`	Check that two arrays are conformable.
`static Array`	`convert(Array org, DataType wantType)`	Convert original array to desired type
`static Array`	`convert2packed(Array unpacked, double missingValue, int nbits, boolean isUnsigned, DataType packedType)`
`static Array`	`convert2Unpacked(Array packed, MAMath.ScaleOffset scaleOffset)`
`static Array`	`convertUnsigned(Array unsigned)`	Convert unsigned data to signed data of a wider type.
`static void`	`copy(Array result, Array a)`	Copy array a to array result, the result array will be in canonical order The operation type is taken from the type of a.
`static void`	`copy(DataType dataType, IndexIterator from, IndexIterator to)`	Copy using iterators.
`static void`	`copyBoolean(Array result, Array a)`	copy array a to array result as bytes The array a and result must be type boolean
`static void`	`copyByte(Array result, Array a)`	copy array a to array result as bytes The values from the array a are converted to byte (if needed), and then converted to the type of result (if needed).
`static void`	`copyChar(Array result, Array a)`	copy array a to array result as char The values from the array a are converted to char (if needed), and then converted to the type of result (if needed).
`static void`	`copyDouble(Array result, Array a)`	copy array a to array result as doubles The values from the arrays a are converted to double (if needed), and then converted to the type of result (if needed).
`static void`	`copyFloat(Array result, Array a)`	copy array a to array result as floats The values from the arrays a are converted to float (if needed), and then converted to the type of result (if needed).
`static void`	`copyInt(Array result, Array a)`	copy array a to array result as integers The values from the arrays a are converted to integer (if needed), and then converted to the type of result (if needed).
`static void`	`copyLong(Array result, Array a)`	copy array a to array result as longs The values from the array a are converted to long (if needed), and then converted to the type of result (if needed).
`static void`	`copyObject(Array result, Array a)`	copy array a to array result as an Object The array a and result must be type object
`static void`	`copyShort(Array result, Array a)`	copy array a to array result as shorts The values from the array a are converted to short (if needed), and then converted to the type of result (if needed).
`static boolean`	`fuzzyEquals(Array data1, Array data2)`	Returns true if the specified arrays have the same size, signedness, and approximately equal corresponding elements.
`static double`	`getMaximum(Array a)`
`static double`	`getMaximumSkipMissingData(Array a, double missingValue)`
`static double`	`getMinimum(Array a)`
`static double`	`getMinimumSkipMissingData(Array a, double missingValue)`
`static MAMath.MinMax`	`getMinMax(Array a)`	Find min and max value in this array, getting values as doubles.
`static MAMath.MinMax`	`getMinMaxSkipMissingData(Array a, double missingValue)`
`static MAMath.MinMax`	`getMinMaxSkipMissingData(Array a, IsMissingEvaluator eval)`
`static boolean`	`isEqual(Array data1, Array data2)`
`static int`	`reducedRank(int[] shape)`	Calculate the reduced rank of this shape, by subtracting dimensions with length 1
`static void`	`setDouble(Array result, double val)`	Set all the elements of this array to the given double value.
`static double`	`sumDouble(Array a)`	sum all of the elements of array a as doubles.
`static double`	`sumDoubleSkipMissingData(Array a, double missingValue)`	sum all of the elements of array a as doubles.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 构造器详细资料
  - MAMath
```
public MAMath()
```
- 方法详细资料
  - add
```
public static Array add(Array a,
                        Array b)
                 throws java.lang.IllegalArgumentException
```
    Add elements of two arrays together, allocating the result array. The result type and the operation type are taken from the type of a.
    
    参数:
    
    a - add values from here
    
    b - add values from here
    
    返回:
    
    result = a + b
    
    抛出:
    
    java.lang.IllegalArgumentException - a and b are not conformable
    
    java.lang.UnsupportedOperationException - dont support this data type yet
  - addDouble
```
public static void addDouble(Array result,
                             Array a,
                             Array b)
                      throws java.lang.IllegalArgumentException
```
    Add elements of two arrays together as doubles, place sum in the result array. The values from the arrays a and b are converted to double (if needed), and the sum is converted to the type of result (if needed).
    
    参数:
    
    result - result array
    
    a - operand
    
    b - operand
    
    抛出:
    
    java.lang.IllegalArgumentException - a,b,and result are not conformable
  - conformable
```
public static boolean conformable(Array a,
                                  Array b)
```
    Check that two arrays are conformable.
    
    参数:
    
    a - operand
    
    b - operand
    
    返回:
    
    true if conformable
  - conformable
```
public static boolean conformable(int[] shapeA,
                                  int[] shapeB)
```
    Check that two array shapes are conformable. The shapes must match exactly, except that dimensions of length 1 are ignored.
    
    参数:
    
    shapeA - shape of array 1
    
    shapeB - shape of array 2
    
    返回:
    
    true if conformable
  - convertUnsigned
```
public static Array convertUnsigned(Array unsigned)
```
    Convert unsigned data to signed data of a wider type.
    
    参数:
    
    unsigned - must be of type byte, short or int
    
    返回:
    
    converted data of type short, int, or long
  - convert
```
public static Array convert(Array org,
                            DataType wantType)
```
    Convert original array to desired type
    
    参数:
    
    org - original array
    
    wantType - desired type
    
    返回:
    
    converted data of desired type, or original array if it is already
  - copy
```
public static void copy(DataType dataType,
                        IndexIterator from,
                        IndexIterator to)
                 throws java.lang.IllegalArgumentException
```
    Copy using iterators. Will copy until !from.hasNext().
    
    参数:
    
    dataType - use this operation type (eg DataType.DOUBLE uses getDoubleNext())
    
    from - copy from here
    
    to - copy to here
    
    抛出:
    
    java.lang.IllegalArgumentException - a and b are not conformable
    
    java.lang.UnsupportedOperationException - dont support this data type
  - copy
```
public static void copy(Array result,
                        Array a)
                 throws java.lang.IllegalArgumentException
```
    Copy array a to array result, the result array will be in canonical order The operation type is taken from the type of a.
    
    参数:
    
    result - copy to here
    
    a - copy from here
    
    抛出:
    
    java.lang.IllegalArgumentException - a and b are not conformable
    
    java.lang.UnsupportedOperationException - dont support this data type yet
  - copyDouble
```
public static void copyDouble(Array result,
                              Array a)
                       throws java.lang.IllegalArgumentException
```
    copy array a to array result as doubles The values from the arrays a are converted to double (if needed), and then converted to the type of result (if needed).
    
    参数:
    
    result - copy to here
    
    a - copy from here
    
    抛出:
    
    java.lang.IllegalArgumentException - a and result are not conformable
  - copyFloat
```
public static void copyFloat(Array result,
                             Array a)
                      throws java.lang.IllegalArgumentException
```
    copy array a to array result as floats The values from the arrays a are converted to float (if needed), and then converted to the type of result (if needed).
    
    参数:
    
    result - copy to here
    
    a - copy from here
    
    抛出:
    
    java.lang.IllegalArgumentException - a and result are not conformable
  - copyLong
```
public static void copyLong(Array result,
                            Array a)
                     throws java.lang.IllegalArgumentException
```
    copy array a to array result as longs The values from the array a are converted to long (if needed), and then converted to the type of result (if needed).
    
    参数:
    
    result - copy to here
    
    a - copy from here
    
    抛出:
    
    java.lang.IllegalArgumentException - a and result are not conformable
  - copyInt
```
public static void copyInt(Array result,
                           Array a)
                    throws java.lang.IllegalArgumentException
```
    copy array a to array result as integers The values from the arrays a are converted to integer (if needed), and then converted to the type of result (if needed).
    
    参数:
    
    result - copy to here
    
    a - copy from here
    
    抛出:
    
    java.lang.IllegalArgumentException - a and result are not conformable
  - copyShort
```
public static void copyShort(Array result,
                             Array a)
                      throws java.lang.IllegalArgumentException
```
    copy array a to array result as shorts The values from the array a are converted to short (if needed), and then converted to the type of result (if needed).
    
    参数:
    
    result - copy to here
    
    a - copy from here
    
    抛出:
    
    java.lang.IllegalArgumentException - a and result are not conformable
  - copyChar
```
public static void copyChar(Array result,
                            Array a)
                     throws java.lang.IllegalArgumentException
```
    copy array a to array result as char The values from the array a are converted to char (if needed), and then converted to the type of result (if needed).
    
    参数:
    
    result - copy to here
    
    a - copy from here
    
    抛出:
    
    java.lang.IllegalArgumentException - a and result are not conformable
  - copyByte
```
public static void copyByte(Array result,
                            Array a)
                     throws java.lang.IllegalArgumentException
```
    copy array a to array result as bytes The values from the array a are converted to byte (if needed), and then converted to the type of result (if needed).
    
    参数:
    
    result - copy to here
    
    a - copy from here
    
    抛出:
    
    java.lang.IllegalArgumentException - a and result are not conformable
  - copyBoolean
```
public static void copyBoolean(Array result,
                               Array a)
                        throws java.lang.IllegalArgumentException
```
    copy array a to array result as bytes The array a and result must be type boolean
    
    参数:
    
    result - copy to here
    
    a - copy from here
    
    抛出:
    
    java.lang.IllegalArgumentException - a and result are not conformable
  - copyObject
```
public static void copyObject(Array result,
                              Array a)
                       throws java.lang.IllegalArgumentException
```
    copy array a to array result as an Object The array a and result must be type object
    
    参数:
    
    result - copy to here
    
    a - copy from here
    
    抛出:
    
    java.lang.IllegalArgumentException - a and result are not conformable
  - reducedRank
```
public static int reducedRank(int[] shape)
```
    Calculate the reduced rank of this shape, by subtracting dimensions with length 1
    
    参数:
    
    shape - shape of the array
    
    返回:
    
    rank without dimensions of length 1
  - getMinimum
```
public static double getMinimum(Array a)
```
  - getMaximum
```
public static double getMaximum(Array a)
```
  - getMinMax
```
public static MAMath.MinMax getMinMax(Array a)
```
    Find min and max value in this array, getting values as doubles. Skip Double.NaN.
    
    参数:
    
    a - the array.
    
    返回:
    
    MinMax
  - getMinMaxSkipMissingData
```
public static MAMath.MinMax getMinMaxSkipMissingData(Array a,
                                                     IsMissingEvaluator eval)
```
  - getMinimumSkipMissingData
```
public static double getMinimumSkipMissingData(Array a,
                                               double missingValue)
```
  - getMaximumSkipMissingData
```
public static double getMaximumSkipMissingData(Array a,
                                               double missingValue)
```
  - getMinMaxSkipMissingData
```
public static MAMath.MinMax getMinMaxSkipMissingData(Array a,
                                                     double missingValue)
```
  - setDouble
```
public static void setDouble(Array result,
                             double val)
```
    Set all the elements of this array to the given double value. The value is converted to the element type of the array, if needed.
    
    参数:
    
    result - change this Array
    
    val - set all elements to this value
  - sumDouble
```
public static double sumDouble(Array a)
```
    sum all of the elements of array a as doubles. The values from the array a are converted to double (if needed).
    
    参数:
    
    a - read values from this Array
    
    返回:
    
    sum of elements
  - sumDoubleSkipMissingData
```
public static double sumDoubleSkipMissingData(Array a,
                                              double missingValue)
```
    sum all of the elements of array a as doubles. The values from the array a are converted to double (if needed).
    
    参数:
    
    a - read values from this Array
    
    missingValue - skip values equal to this, or which are NaNs
    
    返回:
    
    sum of elements
  - calcScaleOffsetSkipMissingData
```
public static MAMath.ScaleOffset calcScaleOffsetSkipMissingData(Array a,
                                                                double missingValue,
                                                                int nbits,
                                                                boolean isUnsigned)
```
    Calculate the scale/offset for an array of numbers.
    If signed: then max value unpacked = 2^(n-1) - 1 packed min value unpacked = -(2^(n-1) - 1) packed note that -2^(n-1) is unused, and a good place to map missing values by solving 2 eq in 2 unknowns, we get: scale = (max - min) / (2^n - 2) offset = (max + min) / 2 If unsigned then max value unpacked = 2^n - 1 packed min value unpacked = 0 packed and: scale = (max - min) / (2^n - 1) offset = min One could modify this to allow a holder for missing values.
    参数:
    
    a - array to convert (not changed)
    
    missingValue - skip these
    
    nbits - map into this many bits
    
    isUnsigned - use signed or unsigned packed values
    
    返回:
    
    ScaleOffset, calculated as above.
  - convert2packed
```
public static Array convert2packed(Array unpacked,
                                   double missingValue,
                                   int nbits,
                                   boolean isUnsigned,
                                   DataType packedType)
```
  - convert2Unpacked
```
public static Array convert2Unpacked(Array packed,
                                     MAMath.ScaleOffset scaleOffset)
```
  - fuzzyEquals
```
public static boolean fuzzyEquals(Array data1,
                                  Array data2)
```
    Returns true if the specified arrays have the same size, signedness, and approximately equal corresponding elements. float elements must be within 1.0e-5 of each other and double elements must be within 1.0e-8 of each other.
    
    参数:
    
    data1 - one array to be tested for equality.
    
    data2 - the other array to be tested for equality.
    
    返回:
    
    true if the specified arrays have the same size, signedness, and approximately equal corresponding elems.
  - isEqual
```
public static boolean isEqual(Array data1,
                              Array data2)
```

修饰符和类型	类	说明
`static class`	`MAMath.MinMax`	Holds a minimum and maximum value.
`static class`	`MAMath.ScaleOffset`	Holds a scale and offset.

类 MAMath

嵌套类概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

MAMath

方法详细资料

add

addDouble

conformable

conformable

convertUnsigned

convert

copy

copy

copyDouble

copyFloat

copyLong

copyInt

copyShort

copyChar

copyByte

copyBoolean

copyObject

reducedRank

getMinimum

getMaximum

getMinMax

getMinMaxSkipMissingData

getMinimumSkipMissingData

getMaximumSkipMissingData

getMinMaxSkipMissingData

setDouble

sumDouble

sumDoubleSkipMissingData

calcScaleOffsetSkipMissingData

convert2packed

convert2Unpacked

fuzzyEquals

isEqual