CALFEM, a finite element toolbox for MATLAB.
The full CALFEM manual can be accessed here: calfem-3.6-manual-full.pdf
A subset for frame and truss analysis can be accessed here: calfem-3.6-manual-bar-beam.pdf
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Click "Download as zip" to download the package and unpack it.
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Add the these directories to the MATLAB path by clicking "Set path" in MATLAB, then "Add with Subfolders...", chose the unpackaged directory and then "Save"."
enter the following commands at the MATLAB prompt:
help beam2e
The help text for the beam2e command should appear if CALFEM is correctly installed.