Hi, I need help with coding for large expressions with integrations as given in the image.

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NAVEED 2024-4-25

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评论： NAVEED 2024-5-8

I m kind of new to Matlab with average level expertise. Can anybody pls provide code for these or similar equations and then I modify according to these. I have used the integral function in coding for these but all I get is an empty graph with no trend. and NaN. Your guidance/help will be highly appreciated. Thanks

The PrL (u) is the LoS probability function, which is

and theta is

Another equation is

,, Again the PL(v) is the LoS probability

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Answer 1

UDAYA PEDDIRAJU 2024-5-8

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编辑：UDAYA PEDDIRAJU 2024-5-8

在 MATLAB Online 中打开

Hi Naveed,

Here's a basic Matlab code snippet that demonstrates a definite integral, similar to what you might use for the provided information:

% Define symbolic variables
syms u v theta PL S1 L eta Vi T fi Ta apa dxa rho;
% Define the integrand (replace with your actual function)
integrand = sin(u)*cos(v); % Placeholder function, replace with your actual expression
% Set integration bounds (adjust as needed)
u_lower = 0.0;
u_upper = pi;
v_lower = 0.0;
v_upper = pi;
% Perform numerical integration
result = double(int(int(integrand, v, v_lower, v_upper), u, u_lower, u_upper));
% Print the integration result
disp('Integration result:')
disp(result)

Explanation:

We define symbolic variables (syms) to represent the variables in your equations (theta, PL, etc.).
The integrand function represents the expression you want to integrate. Replace the sin(u)*cos(v) placeholder with the actual mathematical expression based on your problem.
We set the integration bounds (u_lower, u_upper, v_lower, v_upper) for the definite integrals. Adjust these based on your specific problem.
The "int" function performs the double integration. We nest the "int" function calls because we're performing a definite integral over two variables. Refer: https://www.mathworks.com/help/matlab/ref/integral.html
The "double" function converts the symbolic result to a numerical value.
Finally, we display the integration result.