Need help with creating a function of three parameters

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Stirling Ellis 2022-5-2

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https://ww2.mathworks.cn/matlabcentral/answers/1709885-need-help-with-creating-a-function-of-three-parameters

评论： Jon 2022-5-2

Need help creating a function of three parameters. Below I have my code, but it returns no values. The code should take in the parameters H, VR, and TR. Here is the snip below:

l = 300; %m

wo = 1e5; %Nm

f = 20; %

H = wo * l.^2 ./ (8*f); %Horizontal reaction force

VR = wo .* l / 2; %Vertical reaction force

TR = VR * sqrt(1+ l.^2 ./ (16 * f.^2)); %Tension in cable

L = 1/2 * sqrt(1+ (wo .* l / (2*H)) .^2 ) + H/wo * sinh(wo * l/ (2*H));

%MATLAB function to take in three parameters

function [output] = Force(l,wo,f)

end

Thank you in advance!

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Torsten 2022-5-2

The problem is part of the answer. So it doesn't help to delete it here.

Stirling Ellis 2022-5-2

Didn't think it through. Went ahead and re uploaded it. Thank you

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Answer 1

Jon 2022-5-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1709885-need-help-with-creating-a-function-of-three-parameters#answer_955490

编辑：Jon 2022-5-2

在 MATLAB Online 中打开

You're close. Just put the formulaes inside of the function, and return the outputs of interest. Something like the code shown below. (It looks like you also wanted to compute L, the tension in the cable so I included that in the function. You could also just have returen H, VR,and TR in the function and then computed L.)

Also, to keep everything just in the one screen in the post I put the function at the bottom of a script. You could also save it as a separate .m file

% Inputs:
% l = bridge length (m)
% wo = load per unit length (N/m) % f = cable sag distance (m)
% Outputs:
% H = horizontal force at cable support point (N)
% VR = vertical reaction force at cable support point (N) % TR = cable tension force at support point (N)
l = 400; %m
wo = 1.5e5; %Nm
f = 20; %m
% call the function
[H,VR,TR,L] = Force(l,wo,f)
%MATLAB function to take in three parameters
function [H,VR,TR,L] = Force(l,wo,f)
% Formulas
H = wo * l.^2 ./ (8*f);
VR = wo .* l / 2;
TR = VR * sqrt(1+ l.^2 ./ (16 * f.^2));
% tension in cable
L = 1/2 * sqrt(1+ (wo .* l / (2*H)) .^2 ) + H/wo * sinh(wo * l/ (2*H));
end