Execution of script as a function is not supported

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);

[Davide Masiello]

Hi @Hector Meza, the function TrussFEA is called within the code you attached.

Is there a chance you named the main script TrussFEA as well?

[Hector Meza]

no i didnt its named something else

[Walter Roberson]

Please execute

dbtype TrussFEA 1:5

and show us the result.

[Dyuman Joshi]

The file TrussFEA is defined as a script.

You are trying to call it as a function, providing 6 inputs to it, which is not possible.

https://in.mathworks.com/help/matlab/matlab_prog/scripts-and-functions.html

If you want to use TrussFEA as a function, you will have to define it accordingly.

[Walter Roberson]

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]

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.

Answer 1

[Nipun]

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