Execution of script as a function is not supported

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Hector Meza
Hector Meza 2023-12-7
回答： Nipun 2023-12-18
Im working on a problem for school and im trying to figure out a truss problem. I downloaded a function on mathworks TrussFEA. So when i excute the script i keep getting this problem " Execution of script TrussFEA as a function is not supported:" I don't know why, I am sure I am in the correct folder
I would be gratefull for your assistance, thank you
%Define the truss geometry and material properties
L_horizontal = 1;
L_vertical = 1;
L_inclined = sqrt(21);
E = 100e9; % Young's modulus in Pa
A = 1e-4; % Cross-sectional area in m^2
nu = 0.3; % Poisson's ratio
% Define the nodal coordinates and element connectivity matrix
nodes = [0, 0; L_horizontal, 0; 2*L_horizontal, 0; L_horizontal, L_vertical; L_horizontal, -L_vertical];
elements = [1, 2; 2, 3; 2, 4; 2, 5];
% Define the load cases
F_A = [0; 0; 10000; 0; 10000; 0; 10000; 0; 10000; 0; 10000; 0];
F_B = [0; 0; 0; 10000; 0; -10000; 0; 10000; 0; -10000; 0; 10000];
F_C = [0; 0; 10000; 0; 10000; 0; -10000; 0; 10000; 0; 10000; 0];
% Solve for the nodal displacements and element forces
[displacements_A, element_forces_A] = TrussFEA(nodes, elements, E, A, nu, F_A);
[displacements_B, element_forces_B] = TrussFEA(nodes, elements, E, A, nu, F_B);
[displacements_C, element_forces_C] = TrussFEA(nodes, elements, E, A, nu, F_C);
% Present the results in a table
results = table([displacements_A, element_forces_A], [displacements_B, element_forces_B], [displacements_C, element_forces_C], 'VariableNames', {'LoadCaseA', 'LoadCaseB', 'LoadCaseC'});
disp(results);
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Walter Roberson
Walter Roberson 2023-12-7
TrussFEA from the File Exchange https://www.mathworks.com/matlabcentral/fileexchange/86548-truss-finite-element-analysis-for-matlab is a function -- but it might not be the file being executed, or it might accidentally have been altered.
Stephen23
Stephen23 2023-12-8
The function TRUSSFEA available here:
https://www.mathworks.com/matlabcentral/fileexchange/86548-truss-finite-element-analysis-for-matlab
has the signature
function trussData = TrussFEA(trussData)
which anyway does not support the same number of input and output arguments as the OP shows.

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回答（1 个）

Nipun
Nipun 2023-12-18
Hi Hector,
I understand that you intend to execute the "TrussFEA" script with the mentioned parameters, but are getting an error based on function behaviour.
I assume that the TrussFEA script you are referring to is the same as here : https://in.mathworks.com/matlabcentral/fileexchange/86548-truss-finite-element-analysis-for-matlab
On reading the script, it is evident that the function signature is defined over one output and one input, as follows:
function trussData = TrussFEA(trussData)
However, based on your given code snippet, six arguments are passed to "TrussFEA" as opposed to supported one.
Additionally, the function signature expects a structure as input with the following properties:
%% Primary process
% extracting data from trussData
Nodes = trussData.node;
Elements = trussData.element;
Supports = trussData.support;
ExternalForces = trussData.force;
I would recommend altering your code to define a structure with mentioned properties. For instance, based on the provided information, you may do the following:
% Define the nodal coordinates and element connectivity matrix
nodes = [0, 0; L_horizontal, 0; 2*L_horizontal, 0; L_horizontal, L_vertical; L_horizontal, -L_vertical];
elements = [1, 2; 2, 3; 2, 4; 2, 5];
%% create a structure "trussData" with properties nodes and elements
trussData.node = nodes;
trussData.element = elements;
trussData.support = % Support variable here ;
trussData.force = % assign to external forces variable ;
%% execute the script
result = TrussFEA(trussData);
For additional information on expected argument's properties, refer to the "TrussFEA.m" file linked above. Hope this helps.
Regards,
Nipun

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