DataMath (MeteoInfoLib 1.9 API)

java.lang.Object
- org.meteoinfo.data.DataMath

public abstract class DataMath
extends Object

Template

作者:: Yaqiang Wang

构造器概要

构造器
构造器说明

DataMath()

构造器
构造器	说明
`DataMath()`

方法概要

所有方法静态方法具体方法
限定符和类型	方法	说明
`static Object`	`abs(Object a)`	Take abstract value
`static Object`	`acos(Object a)`	Take anti-cosine value
`static Object`	`add(Object a, Object b)`	Tack add operator of two objects
`static Object`	`asin(Object a)`	Take anti-sine value
`static Object`	`atan(Object a)`	Take anti-tangent value
`static GridData`	`average(List<GridData> gDataList)`	Calculate average grid data from grid data list
`static GridData`	`average(List<GridData> gDataList, boolean ignoreUndef)`	Calculate average grid data from grid data list
`static GridData`	`average(List<GridData> gDataList, boolean ignoreUndef, int validNum)`	Calculate average grid data from grid data list
`static GridData`	`cdiff(GridData aData, boolean isX)`	Performs a centered difference operation on a grid data in the x or y direction
`static Object`	`cos(Object a)`	Take cosine value
`static Object`	`div(Object a, Object b)`	Take divide operator of two objects
`static GridData`	`div_1(double value, GridData gridData)`	Divide operation between a double value and a grid data
`static StationData`	`div_1(double value, StationData stData)`	Divide operator between a double value and a station data
`static Object`	`exp(Object a)`	Take e base power value
`static Object[]`	`gauss2Lats(int nlat)`	This function provides latitudes on a Gaussian grid from the number of latitude lines
`static double[]`	`getDSFromUV(double U, double V)`	Get wind direction/speed from U/V
`static GridData[]`	`getDSFromUV(GridData uData, GridData vData)`	Get wind direction/speed grid data from wind U/V grid data
`static StationData[]`	`getDSFromUV(StationData uData, StationData vData)`	Get wind direction/speed station data from wind U/V station data
`static double[]`	`getEndPoint(double x, double y, double angle, double len)`	Get end point by start point, angle and length
`static float`	`getR(List<Double> xData, List<Double> yData)`	Get correlation coefficient How well did the forecast values correspond to the observed values?
`static float`	`getR(ColumnData xcData, ColumnData ycData)`	Get correlation coefficient How well did the forecast values correspond to the observed values?
`static double[]`	`getUVFromDS(double windDir, double windSpeed)`	Get wind U/V from wind direction/speed
`static GridData[]`	`getUVFromDS(GridData windDirData, GridData windSpeedData)`	Get wind U/V grid data from wind direction/speed grid data
`static StationData[]`	`getUVFromDS(StationData windDirData, StationData windSpeedData)`	Get wind U/V station data from wind direction/speed station data
`static GridData`	`hcurl(GridData uData, GridData vData)`	Calculates the vertical component of the curl (ie, vorticity)
`static GridData`	`hdivg(GridData uData, GridData vData)`	Calculates the horizontal divergence using finite differencing
`static double[]`	`leastSquareTrend(double[] xData, double[] yData)`	Determine the least square trend equation - linear fitting
`static GridData`	`leastSquareTrend(List<GridData> dataList, double[] xData)`	Determine the least square trend equation - linear fitting
`static Object`	`log(Object a)`	Take logrithm value
`static Object`	`log10(Object a)`	Take 10 base logrithm value
`static GridData`	`magnitude(GridData uData, GridData vData)`	Take magnitude value from U/V grid data
`static StationData`	`magnitude(StationData uData, StationData vData)`	Take magnitude value from U/V station data
`static double[]`	`mann_Kendall_Trend(double[] ts)`	Mann-Kendall trend statistics
`static double[]`	`mann_Kendall_Trend(List<Double> ts)`	Mann-Kendall trend statistics
`static double[]`	`mann_Kendall_Trend_1(double[] ts)`	Mann-Kendall trend statistics
`static StationData`	`mean(List<StationData> datalist)`	Compute the arithmetic mean station data
`static Object`	`mul(Object a, Object b)`	Take multiply operator of two objects
`static Object`	`pow(Object a, double p)`	Take power value
`static Object`	`sin(Object a)`	Take sine value
`static Object`	`sqrt(Object a)`	Take squre root value
`static GridData`	`sub(double value, GridData gridData)`	Subtract operation between a double value and a grid data
`static StationData`	`sub(double value, StationData stData)`	Subtract operator between a double value and a station data
`static Object`	`sub(Object a, Object b)`	Take subtract operator of two objects
`static double`	`sum(double[] values)`	Summary the value array
`static Object`	`tan(Object a)`	Take tangent value

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
  - DataMath
```
public DataMath()
```
- 方法详细资料
  - add
```
public static Object add(Object a,
                         Object b)
```
    Tack add operator of two objects
    
    参数:
    
    a - Object a
    
    b - Object b
    
    返回:
    
    Result object
  - sub
```
public static Object sub(Object a,
                         Object b)
```
    Take subtract operator of two objects
    
    参数:
    
    a - Object a
    
    b - Object b
    
    返回:
    
    Result object
  - sub
```
public static GridData sub(double value,
                           GridData gridData)
```
    Subtract operation between a double value and a grid data
    
    参数:
    
    value - Double value
    
    gridData - Grid data
    
    返回:
    
    Result grid data
  - sub
```
public static StationData sub(double value,
                              StationData stData)
```
    Subtract operator between a double value and a station data
    
    参数:
    
    value - The value
    
    stData - Station data
    
    返回:
    
    Result station data
  - mul
```
public static Object mul(Object a,
                         Object b)
```
    Take multiply operator of two objects
    
    参数:
    
    a - Object a
    
    b - Object b
    
    返回:
    
    Result object
  - div
```
public static Object div(Object a,
                         Object b)
```
    Take divide operator of two objects
    
    参数:
    
    a - Object a
    
    b - Object b
    
    返回:
    
    Result object
  - div_1
```
public static GridData div_1(double value,
                             GridData gridData)
```
    Divide operation between a double value and a grid data
    
    参数:
    
    value - Double value
    
    gridData - Grid data
    
    返回:
    
    Result grid data
  - div_1
```
public static StationData div_1(double value,
                                StationData stData)
```
    Divide operator between a double value and a station data
    
    参数:
    
    value - The value
    
    stData - Station data
    
    返回:
    
    Result station data
  - getUVFromDS
```
public static double[] getUVFromDS(double windDir,
                                   double windSpeed)
```
    Get wind U/V from wind direction/speed
    
    参数:
    
    windDir - The wind direction
    
    windSpeed - The wind speed
    
    返回:
    
    Wind U/V
  - getUVFromDS
```
public static GridData[] getUVFromDS(GridData windDirData,
                                     GridData windSpeedData)
```
    Get wind U/V grid data from wind direction/speed grid data
    
    参数:
    
    windDirData - Wind directoin grid data
    
    windSpeedData - Wind speed grid data
    
    返回:
    
    U/V grid data
  - getUVFromDS
```
public static StationData[] getUVFromDS(StationData windDirData,
                                        StationData windSpeedData)
```
    Get wind U/V station data from wind direction/speed station data
    
    参数:
    
    windDirData - Wind direction station data
    
    windSpeedData - Wind speed station data
    
    返回:
    
    U/V station data
  - getDSFromUV
```
public static double[] getDSFromUV(double U,
                                   double V)
```
    Get wind direction/speed from U/V
    
    参数:
    
    U - The U value
    
    V - The V value
    
    返回:
    
    Wind direction/speed array
  - getDSFromUV
```
public static GridData[] getDSFromUV(GridData uData,
                                     GridData vData)
```
    Get wind direction/speed grid data from wind U/V grid data
    
    参数:
    
    uData - U grid data
    
    vData - V grid data
    
    返回:
    
    Wind direction/speed grid data
  - getDSFromUV
```
public static StationData[] getDSFromUV(StationData uData,
                                        StationData vData)
```
    Get wind direction/speed station data from wind U/V station data
    
    参数:
    
    uData - U station data
    
    vData - V station data
    
    返回:
    
    Wind direction/speed station data
  - getEndPoint
```
public static double[] getEndPoint(double x,
                                   double y,
                                   double angle,
                                   double len)
```
    Get end point by start point, angle and length
    
    参数:
    
    x - Start point x
    
    y - Start point y
    
    angle - Angle
    
    len - Length
    
    返回:
    
    End point x/y values;
  - sum
```
public static double sum(double[] values)
```
    Summary the value array
    
    参数:
    
    values - Values
    
    返回:
    
    Summary
  - abs
```
public static Object abs(Object a)
```
    Take abstract value
    
    参数:
    
    a - Object a
    
    返回:
    
    Result object
  - asin
```
public static Object asin(Object a)
```
    Take anti-sine value
    
    参数:
    
    a - Object a
    
    返回:
    
    Result object
  - acos
```
public static Object acos(Object a)
```
    Take anti-cosine value
    
    参数:
    
    a - Object a
    
    返回:
    
    Result object
  - atan
```
public static Object atan(Object a)
```
    Take anti-tangent value
    
    参数:
    
    a - Object a
    
    返回:
    
    Result object
  - sin
```
public static Object sin(Object a)
```
    Take sine value
    
    参数:
    
    a - Object a
    
    返回:
    
    Result object
  - cos
```
public static Object cos(Object a)
```
    Take cosine value
    
    参数:
    
    a - Object a
    
    返回:
    
    Result object
  - tan
```
public static Object tan(Object a)
```
    Take tangent value
    
    参数:
    
    a - Object a
    
    返回:
    
    Result object
  - exp
```
public static Object exp(Object a)
```
    Take e base power value
    
    参数:
    
    a - Object a
    
    返回:
    
    Result object
  - pow
```
public static Object pow(Object a,
                         double p)
```
    Take power value
    
    参数:
    
    a - Object a
    
    p - Power value
    
    返回:
    
    Result object
  - log
```
public static Object log(Object a)
```
    Take logrithm value
    
    参数:
    
    a - Object a
    
    返回:
    
    Result object
  - log10
```
public static Object log10(Object a)
```
    Take 10 base logrithm value
    
    参数:
    
    a - Object a
    
    返回:
    
    Result object
  - sqrt
```
public static Object sqrt(Object a)
```
    Take squre root value
    
    参数:
    
    a - Object a
    
    返回:
    
    Result object
  - average
```
public static GridData average(List<GridData> gDataList)
```
    Calculate average grid data from grid data list
    
    参数:
    
    gDataList - Grid data list
    
    返回:
    
    Averaged grid data
  - average
```
public static GridData average(List<GridData> gDataList,
                               boolean ignoreUndef)
```
    Calculate average grid data from grid data list
    
    参数:
    
    gDataList - Grid data list
    
    ignoreUndef - If ignore missing data
    
    返回:
    
    Averaged grid data
  - average
```
public static GridData average(List<GridData> gDataList,
                               boolean ignoreUndef,
                               int validNum)
```
    Calculate average grid data from grid data list
    
    参数:
    
    gDataList - Grid data list
    
    ignoreUndef - If ignore missing value
    
    validNum - Valid number
    
    返回:
    
    Averaged grid data
  - mean
```
public static StationData mean(List<StationData> datalist)
```
    Compute the arithmetic mean station data
    
    参数:
    
    datalist - station data list
    
    返回:
    
    Mean station data
  - leastSquareTrend
```
public static double[] leastSquareTrend(double[] xData,
                                        double[] yData)
```
    Determine the least square trend equation - linear fitting
    
    参数:
    
    xData - X data array
    
    yData - Y data array
    
    返回:
    
    Result array - y intercept and slope
  - leastSquareTrend
```
public static GridData leastSquareTrend(List<GridData> dataList,
                                        double[] xData)
```
    Determine the least square trend equation - linear fitting
    
    参数:
    
    dataList - Grid data list
    
    xData - X data array
    
    返回:
    
    Result grid data - slop
  - getR
```
public static float getR(List<Double> xData,
                         List<Double> yData)
```
    Get correlation coefficient How well did the forecast values correspond to the observed values? Range: -1 to 1. Perfect score: 1.
    
    参数:
    
    xData - X data array
    
    yData - Y data array
    
    返回:
    
    Correlation coefficent
  - getR
```
public static float getR(ColumnData xcData,
                         ColumnData ycData)
```
    Get correlation coefficient How well did the forecast values correspond to the observed values? Range: -1 to 1. Perfect score: 1.
    
    参数:
    
    xcData - X data array
    
    ycData - Y data array
    
    返回:
    
    Correlation coefficent
  - mann_Kendall_Trend
```
public static double[] mann_Kendall_Trend(List<Double> ts)
```
    Mann-Kendall trend statistics
    
    参数:
    
    ts - Input data list
    
    返回:
    
    Result array - z (trend)/beta (change value per unit time)
  - mann_Kendall_Trend
```
public static double[] mann_Kendall_Trend(double[] ts)
```
    Mann-Kendall trend statistics
    
    参数:
    
    ts - Input data array
    
    返回:
    
    Result array - z (trend)/beta (change value per unit time)
  - mann_Kendall_Trend_1
```
public static double[] mann_Kendall_Trend_1(double[] ts)
```
    Mann-Kendall trend statistics
    
    参数:
    
    ts - Input data array
    
    返回:
    
    Result array - z (trend)/beta (change value per unit time)
  - magnitude
```
public static GridData magnitude(GridData uData,
                                 GridData vData)
```
    Take magnitude value from U/V grid data
    
    参数:
    
    uData - U grid data
    
    vData - V grid data
    
    返回:
    
    Magnitude grid data
  - magnitude
```
public static StationData magnitude(StationData uData,
                                    StationData vData)
```
    Take magnitude value from U/V station data
    
    参数:
    
    uData - U station data
    
    vData - V station data
    
    返回:
    
    Magnitude station data
  - cdiff
```
public static GridData cdiff(GridData aData,
                             boolean isX)
```
    Performs a centered difference operation on a grid data in the x or y direction
    
    参数:
    
    aData - The grid data
    
    isX - If is x direction
    
    返回:
    
    Result grid data
  - hcurl
```
public static GridData hcurl(GridData uData,
                             GridData vData)
```
    Calculates the vertical component of the curl (ie, vorticity)
    
    参数:
    
    uData - U component
    
    vData - V component
    
    返回:
    
    Curl
  - hdivg
```
public static GridData hdivg(GridData uData,
                             GridData vData)
```
    Calculates the horizontal divergence using finite differencing
    
    参数:
    
    uData - U component
    
    vData - V component
    
    返回:
    
    Divergence
  - gauss2Lats
```
public static Object[] gauss2Lats(int nlat)
```
    This function provides latitudes on a Gaussian grid from the number of latitude lines
    
    参数:
    
    nlat - the number of latitude lines
    
    返回:
    
    The latitudes of hemisphere

类 DataMath

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

DataMath

方法详细资料

add

sub

sub

sub

mul

div

div_1

div_1

getUVFromDS

getUVFromDS

getUVFromDS

getDSFromUV

getDSFromUV

getDSFromUV

getEndPoint

sum

abs

asin

acos

atan

sin

cos

tan

exp

pow

log

log10

sqrt

average

average

average

mean

leastSquareTrend

leastSquareTrend

getR

getR

mann_Kendall_Trend

mann_Kendall_Trend

mann_Kendall_Trend_1

magnitude

magnitude

cdiff

hcurl

hdivg

gauss2Lats