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An XY Dataset plots pairs of values as points on the chart. The XY charts have two numeric axes.
If the dataset is arranged by column, each row is expected to have three columns. Each row is assumed to represent one data point on the chart, ordered by the series name and domain value. The first column's values contain the name of the series. The second column is numeric, containing the domain value of the data point. The third column is numeric, containing the range value of the data point.
If the dataset is arranged by row, each row is expected to contain all the data points for the series. The first column's values contain the name of the series. It is assumed the other columns in the row consist of a collection of x/y data points (i.e. columns 2, 4, 6 etc. will be domain values, and columns 3, 5, 7 etc will be range values).
Here is a query and dataset from the Pentaho sample data that demonstrates a columnbased XY dataset:
Select PRODUCTLINE, MSRP, BUYPRICE FROM PRODUCTS order by PRODUCTLINE 
This query results in the following dataset (the data has been truncated to save space):
PRODUCTLINE 
MSRP 
BUYPRICE 

Classic Cars 
101.15 
46.53 
Classic Cars 
80.84 
32.33 
Classic Cars 
118.28 
69.78 
Classic Cars 
140.43 
98.3 
Classic Cars 
107.08 
62.11 
... 


Motorcycles 
81.36 
34.17 
Motorcycles 
102.05 
56.13 
Motorcycles 
40.23 
24.14 
Motorcycles 
99.89 
66.92 
... 


Planes 
49.66 
32.77 
Planes 
74.03 
36.27 
Planes 
80 
54.4 
Planes 
118.65 
59.33 
Planes 
99.72 
68.8 
... 


Handing this dataset to a chart, the chart will plot the data by column by default. Here is an xy line chart example:
To plot the data by rows, you must add the byrow property to the action sequence component definition. (You can set this property in the Design Studio by checking the Chart Row Dimension checkbox.) Also, your data must be arranged in row format.
<byrow>true</byrow> 
Here is a sample XY dataset, arranged by rows.
Here is a bar chart example, with the same dataset plotted by rows: