tLineChart

Schema and Edit Schema

• A schema is a row description. It defines the number of fields (columns) to be processed and passed on to the next component. When you create a Spark Job, avoid the reserved word line when naming the fields.

  Information noteNote:

  The schema of tLineChart contains three read-only columns named series (string), x (integer), and y (integer) respectively, in a fixed order. The data in any extra columns will be only passed to the next component, if any, without being presented in the generated line chart.

• Built-in: The schema is created and stored locally for this component only. For more information about a component schema in its Basic settings tab, see Basic settings tab.

• Repository: The schema already exists and is stored in the Repository, hence can be reused. For more information about a component schema in its Basic settings tab, see Basic settings tab.

Sync columns

Click to synchronize the output file schema with the input file schema. The Sync function only displays once the Row connection is linked with the output component.

Generated image path

Name and path of the output image file.

Chart title

Enter the title of the line chart to be generated.

Domain axis label and Range axis label

Enter the domain axis (X axis) and range axis (Y axis) labels.

Plot orientation

Select the plot orientation of the range axis: Vertical or Horizontal.

Include legend

Select this check box if you want your line chart to include a legend, indicating the lines of different series in different colors.

Image width and Image height

Enter the width and height of the image, in pixels.

Moving average

Select this check box to show a moving average for each series on your line chart. With this check box selected, the Period field appears, letting you define a period of which you want to show the moving average.

Lower bound and Upper bound

Define the lowest and highest values to be displayed on the range axis.

Chart background and Plot background

Select the chart background color and the plot area background color.

tStat Catcher Statistics

Select this check box to collect log data at the component level.

Enable parallel execution

Global Variables

NB_LINE: the number of rows read by an input component or transferred to an output component. This is an After variable and it returns an integer.

ERROR_MESSAGE: the error message generated by the component when an error occurs. This is an After variable and it returns a string. This variable functions only if the Die on error check box is cleared, if the component has this check box.

A Flow variable functions during the execution of a component while an After variable functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl+Space to access the variable list and choose the variable to use from it.

For more information about variables, see Using contexts and variables.

Usage rule

This component is mainly used as Output component. It requires an Input component and Row main link as input.