DimVar

Version 1.2.0.0 (36.9 KB) by Tyler V
A class for handling dimensioned variables in Matlab
417 Downloads
Updated 17 Aug 2015

DimVar is a class is for handling dimensioned quantities in Matlab.
It is designed to be a "stand-in" replacement for numeric data in Matlab that carries units and checks them during normal operations.
For example, you could use it to calculate conduction with mixed units as:
k = DimVar(4,'BTU-in/hr-ft^2-F');
L = DimVar(5,'mm');
A = DimVar(10,'cm^2');
DT = DimVar(500,'R') - DimVar(200,'K');

Q = k*A/L*DT;

where in this case the units are carried through to get Q in Watts. It also checks
for unit validity in math operations, so the following would generate an error:

x = k + L

since the units of k and L are different. However,

x = L + sqrt(A);
y = exp(-x/L);
V = A*L;

would be allowed.

The rules for writing the unit string are:
* Use a single solidus (/) as the separator between numerator and denominator.
* Use hyphens (-) to separate individual unit components
* Indicate powers either with or without a '^' (m^3 or m3)
* Indicate inverse units as either 1/x or x^-1
* Temperatures will be treated as absolute unless you add the optional 'Relative' argument, as in

DT = DimVar(10,'C','Relative')

otherwise the 10 C value will be converted to 283.15 K rather than 10 K. You can also deal with it by using the subtraction, so

DT = DimVar(10,'C') - DimVar(0,'C')

The most up-to-date version of this class is hosted on Github at:
http://github.com/tgvoskuilen/MatlabTools

Cite As

Tyler V (2024). DimVar (https://github.com/tgvoskuilen/MatlabTools), GitHub. Retrieved .

MATLAB Release Compatibility
Created with R2012a
Compatible with any release
Platform Compatibility
Windows macOS Linux
Categories
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Version Published Release Notes
1.2.0.0

Changed file upload to link directly to GitHub repo

1.1.0.0

Updated array treatment and evaluation of unary functions with dimensionless inputs

1.0.0.0

To view or report issues in this GitHub add-on, visit the GitHub Repository.
To view or report issues in this GitHub add-on, visit the GitHub Repository.