Dundas Chart for Windows Forms
GroupByAxisLabel(String,Series) Method
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DundasWinChart Assembly > Dundas.Charting.WinControl Namespace > DataManipulator Class > GroupByAxisLabel Method : GroupByAxisLabel(String,Series) Method


formula
The formula(s) to be used for calculating the "grouped" data point values. Multiple formulas can be specified by using comma-separated values.
Grouping formula.
inputSeries
The Series to be grouped. Original values are cleared and the series then stores the new grouped values.
Input data series.

Enterprise Edition Only Feature. Groups a series' data by axis labels using one or more formulas. The series is cleared of its original data, and then used to store the new data points.


Grouping by X value, when it’s a string (stored in AxisLabel property).

Syntax

Visual Basic (Declaration)  
Public Overloads Sub GroupByAxisLabel( _
   ByVal formula As String, _
   ByVal inputSeries As Series _
)
Visual Basic (Usage) Copy Code
Dim instance As DataManipulator
Dim formula As String
Dim inputSeries As Series
 
instance.GroupByAxisLabel(formula, inputSeries)
C#  
public void GroupByAxisLabel( 
   string formula,
   Series inputSeries
)

Parameters

formula
The formula(s) to be used for calculating the "grouped" data point values. Multiple formulas can be specified by using comma-separated values.
Grouping formula.
inputSeries
The Series to be grouped. Original values are cleared and the series then stores the new grouped values.
Input data series.

Example

The following sample demonstrates how to group together company sales by sales person. We will assume that a series named "Sales" stores numerous data points that measure a volume of sales, and that the names of sales people are used for axis labels. This grouping will then result in the total sales of each sales person being displayed.
Visual Basic Copy Code
Imports Dundas.Charting.WinControl
...

' Group data by axis label.
Chart1.DataManipulator.GroupByAxisLabel("SUM", Chart1.Series("Sales"))

Remarks

Data points that have the exact same X-axis label (determined by the AxisLabel property) are grouped together into one data point. This new data point has Y-value(s) that are determined by the applied formula(s). Note that axis label comparisons are case sensitive.

The grouped data points are also sorted. For example, grouped data points with a "John" label will be displayed before grouped data points with a "Mark" label.

The first specified formula is the default, and is applied to all Y-values that are not calculated using subsequent formulas. Formulas specified after the default formula must have a "value" prefix to identify which value they should be applied to. For example, an expression of "SUM, Y2:AVE" means that an average of secondary Y-values will be calculated, and a sum of all other Y-values will be calculated. See Table1  for a listing of possible formulas and their descriptions.

Formulas are not applied to X-values, only to Y-values.

To group data by axis labels and preserve the original series use another definition of this function that has an outputSeries parameter.

All data points in the given series are grouped (i.e. it is not possible to group only some of a series' data points).

Empty data points will be ignored or treated as zeros, depending on the IgnoreEmptyPoints property (by default IgnoreEmptyPoints is True).

Formula   Description Used for X-Value
AVE The average value of all data points within the given interval. No.
MAX The maximum value of all data points within the given interval. No.
MIN The minimum value of all data points within the given interval. No.
SUM The total value of all data points within the given interval. No.
LAST The last value of all data points within the given interval. Yes. New data points are drawn at the right-most margin of intervals.
FIRST The first value of all data points within the given interval. Yes. New data points are drawn at the left-most margin of intervals.
HiLoOpCl Calculates the largest, smallest, opening and closing values. Opening value is the first value in the interval, while the closing value is the last value for the interval.

NOTE: this formula returns four Y-values, and should only be used for chart types that use four Y-values (e.g. Candlestick charts)		 No.
HiLo The largest and smallest of all data points within the given interval.
 
NOTE: this formula returns two Y-values, and should only be used for chart type that use two Y-values (e.g. Bubble charts).		 No.
Count The number of data points that have been grouped into one point. No.
DistinctCount The number of data points that have been grouped into one point. Data points that have the same primary Y-values are considered one point. No.
Variance The variance between all data points within the given interval. No.
Deviation The deviation between all data points within the given interval. No.
Center The deviation between all data points within the given interval. Yes. New data points are drawn at the center of intervals.

Table 1: Formulas.

Requirements

Target Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows Server 2008 family

See Also

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