Code covered by the BSD License  

Highlights from
Truss Design Optimization Based on Generative Algorithms

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from Truss Design Optimization Based on Generative Algorithms by James Allison
Supplementary material for a WCSMO publication regarding truss design optimization.

JacobianStresscal(D, Area) 
%Author: Ashish Khetan (khetan2@illinois.edu)
%Engineering System Design Lab,
%Industrial and Enterprise Systems Engineering, UIUC, IL, USA

% Copyright (c) 2013, Engineering System Design Lab (ESDL)
% All rights reserved.
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% Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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% Neither the name of the ESDL nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
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% Function to calculate Jacobian matrix of stress values for given Area
% values using numerical central difference method
function [JacobianStress] = JacobianStresscal(D, Area)
dArea = 0.001;
n = length(Area);
JacobianStress = zeros(n,n);
for i = 1:n
   e = zeros(size(Area));
   e(i) = 1;
   JacobianStress(:,i) = (Stresscal(D, Area+dArea*e) - Stresscal(D, Area-dArea*e))/(2*dArea);
end
end

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