Related techniques make it possible to write scientific programs and solve physics problems.

• The initial diagram consists of boxes that represent input data and an output box.

• Physical laws and geometric models may be selected by menu and added to the picture.

• Connections may be made between diagram buttons and data.

• A program is generated from the diagram by symbolic data flow:
  • Initially, input data and constants are defined.

  • When a data item becomes defined, its value is propagated into boxes to which it is connected.

  • When a value is propagated into a box, equations associated with the box are examined to see whether they can be solved for other variables.

  • Code is generated as a side-effect of the data flow.

• Units of measurement are converted automatically.

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