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java.lang.Objectucar.ma2.MAMath
public class MAMath
Element by element algebra on Arrays
Index
Nested Class Summary | |
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static class |
MAMath.MinMax
Holds a minimum and maximum value. |
static class |
MAMath.ScaleOffset
Holds a scale and offset. |
Constructor Summary | |
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MAMath()
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Method Summary | |
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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(Array a,
Array b)
Check that two arrays are conformable. |
static boolean |
conformable(int[] shapeA,
int[] shapeB)
Check that two array shapes 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 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 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. |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public MAMath()
Method Detail |
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public static Array add(Array a, Array b) throws java.lang.IllegalArgumentException
a
- add values from hereb
- add values from here
java.lang.IllegalArgumentException
- a and b are not conformable
java.lang.UnsupportedOperationException
- dont support this data type yetpublic static void addDouble(Array result, Array a, Array b) throws java.lang.IllegalArgumentException
result
- result arraya
- operandb
- operand
java.lang.IllegalArgumentException
- a,b,and result are not conformablepublic static boolean conformable(Array a, Array b)
a
- operandb
- operand
public static boolean conformable(int[] shapeA, int[] shapeB)
shapeA
- shape of array 1shapeB
- shape of array 2
public static Array convertUnsigned(Array unsigned)
unsigned
- must be of type byte, short or int
public static Array convert(Array org, DataType wantType)
org
- original arraywantType
- desired type
public static void copy(DataType dataType, IndexIterator from, IndexIterator to) throws java.lang.IllegalArgumentException
dataType
- use this operation type (eg DataType.DOUBLE uses getDoubleNext())from
- copy from hereto
- copy to here
java.lang.IllegalArgumentException
- a and b are not conformable
java.lang.UnsupportedOperationException
- dont support this data typepublic static void copy(Array result, Array a) throws java.lang.IllegalArgumentException
result
- copy to herea
- copy from here
java.lang.IllegalArgumentException
- a and b are not conformable
java.lang.UnsupportedOperationException
- dont support this data type yetpublic static void copyDouble(Array result, Array a) throws java.lang.IllegalArgumentException
result
- copy to herea
- copy from here
java.lang.IllegalArgumentException
- a and result are not conformablepublic static void copyFloat(Array result, Array a) throws java.lang.IllegalArgumentException
result
- copy to herea
- copy from here
java.lang.IllegalArgumentException
- a and result are not conformablepublic static void copyLong(Array result, Array a) throws java.lang.IllegalArgumentException
result
- copy to herea
- copy from here
java.lang.IllegalArgumentException
- a and result are not conformablepublic static void copyInt(Array result, Array a) throws java.lang.IllegalArgumentException
result
- copy to herea
- copy from here
java.lang.IllegalArgumentException
- a and result are not conformablepublic static void copyShort(Array result, Array a) throws java.lang.IllegalArgumentException
result
- copy to herea
- copy from here
java.lang.IllegalArgumentException
- a and result are not conformablepublic static void copyChar(Array result, Array a) throws java.lang.IllegalArgumentException
result
- copy to herea
- copy from here
java.lang.IllegalArgumentException
- a and result are not conformablepublic static void copyByte(Array result, Array a) throws java.lang.IllegalArgumentException
result
- copy to herea
- copy from here
java.lang.IllegalArgumentException
- a and result are not conformablepublic static void copyBoolean(Array result, Array a) throws java.lang.IllegalArgumentException
result
- copy to herea
- copy from here
java.lang.IllegalArgumentException
- a and result are not conformablepublic static void copyObject(Array result, Array a) throws java.lang.IllegalArgumentException
result
- copy to herea
- copy from here
java.lang.IllegalArgumentException
- a and result are not conformablepublic static int reducedRank(int[] shape)
shape
- shape of the array
public static double getMinimum(Array a)
public static double getMaximum(Array a)
public static MAMath.MinMax getMinMax(Array a)
a
- the array.
public static double getMinimumSkipMissingData(Array a, double missingValue)
public static double getMaximumSkipMissingData(Array a, double missingValue)
public static MAMath.MinMax getMinMaxSkipMissingData(Array a, double missingValue)
public static void setDouble(Array result, double val)
result
- change this Arrayval
- set all elements to this valuepublic static double sumDouble(Array a)
a
- read values from this Array
public static double sumDoubleSkipMissingData(Array a, double missingValue)
a
- read values from this ArraymissingValue
- skip values equal to this, or which are NaNs
public static MAMath.ScaleOffset calcScaleOffsetSkipMissingData(Array a, double missingValue, int nbits, boolean isUnsigned)
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.
a
- array to convert (not changed)missingValue
- skip thesenbits
- map into this many bitsisUnsigned
- use signed or unsigned packed values
public static Array convert2packed(Array unpacked, double missingValue, int nbits, boolean isUnsigned, DataType packedType)
public static Array convert2Unpacked(Array packed, MAMath.ScaleOffset scaleOffset)
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