How Can I Parse Mathematical Expressions in LabVIEW?

Updated Jan 9, 2023

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Solution

There are a variety of tools for parsing mathematical expressions in LabVIEW. Three possible routes are listed below.

The simplest and most accessible functions in LabVIEW are contained in the 1D & 2D Evaluation VIs . These VIs can parse functions and evaluate them at multiple points as defined by the user.
For parsing more general/complex functions at a single point, LabVIEW has the Formula Parsing VIs . There are three such VIs:
- Parse Formula Node : This function cannot parse formulas dynamically, but it can parse static formulas declared in the node prior to run-time.
- Parse String Formula : This VI can parse formulas dynamically and can be evaluated using the Eval Parsed Formula String VI .
- Substitute Variables : This VI allows users to build larger functions from smaller functions which can then be evaluated later using the Parse String Formula VI .
External Libraries: External DLLs or Python Scripts can be used with LabVIEW which may have functions already optimized for string parsing.
GPower Toolset : This is a third-party add-on that offers additional functionality for parsing mathematical expressions such as Boolean expressions.

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