Code Panels

These panels allow you to write any kind of program with no limitations. You can read values from previous panels and set your own value for the code panel result. You can run custom calculations

Supported languages

• JavaScript
• Python
• Ruby
• R
• Julia

Importing 3rd party libraries

Since DataStation uses the language already installed, you can import any libraries you already have installed too.

This means that even when DataStation doesn't support a particular API or database, you can install a language-level package on your system so you can write your own custom code to make requests or queries to any system.

Communicating between panels

Use DM_getPanel($number) or DM_getPanel('$panelName') to pull the results from another panel where $number is the index of the panel (starting from zero) or $panelName is the name of the panel you want to grab. Similarly, use DM_setPanel($var) to set the current panel's result.

Panel results can be of any format. But when setting a panel you intend to have read from a Table or Graph panel, there is a single accepted data format.

In-Memory SQL

In-memory SQL is a way of running SQL queries solely against other panels without a running database. It is useful in situations where you don't have a database but the most natural way to express a join or filter is in SQL rather than code.

SQL panels can refer to the results of other panels by using DM_getPanel($number) where $number is the zero-indexed panel you want to grab. Or, like other languages, you can also refer by name DM_getPanel('$panelName') where $panelName is the name of the panel you want to grab.

DM_getPanel should only be called once. After that it can be referred to by the alias t_$number or "t_$panelName". For example: SELECT * FROM DM_getPanel(0) WHERE t_0.age < 12 will fetch all results from the first panel (zero-indexed) and filter out rows where the age column is less than 12.

Table and Graph panel data format

Table and Graph panels must read from a panel that formats data as an array of objects. Each object-element must be a mapping of column name to column value. For example: [{ "age": 1, "name": "Eliza" }, { "age": 3, "name": "Javier" }].

Overriding program path

If you want to use a version of the language that is not in your $PATH or not the default, you can modify $HOME/DataStationProjects/.settings and modify the ${language}Path variable (e.g. rPath, pythonPath) to point at the program you'd like to be run.

About this page

See an error or want to add a clarification? This page is generated from this file on Github.

Last edited Jan 20, 2022.