Generate code for randomly oriented short fiber RVE?

Question

RAJESH 2023-1-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1891835-generate-code-for-randomly-oriented-short-fiber-rve

评论： RAJESH 2023-1-12

采纳的回答： Constantino Carlos Reyes-Aldasoro

Kindly look into the below code, i am not able to run it, if there is any issue.

function Fiber=Generate_Fiber(x,y,z,L,N)

%input

%x=[x1 x2]: x boundaries of the box

%y=[y1 y2]: y boundaries of the box

%z=[z1 z2]: z boundaries of the box

%L: Length of fibers

%N: Number of fibers

%output

%Fiber: (N,6) matrix of fiber coordinates with (:,1), (:,2) and (:,3) are x,y, and z coordinates of one end

%and (:,4),(:,5) and (:,6) are x,y, and z coordinates of the other end.

for i=1:1:N

while 1

x1=min(x)+(max(x)-min(x))*rand(1);

y1=min(y)+(max(y)-min(y))*rand(1);

z1=min(z)+(max(z)-min(z))*rand(1);

theta=2*pi*rand(1);

v=2*rand(1)-1;

x2=x1+L*sqrt(1-v^2)*cos(theta);

y2=y1+L*sqrt(1-v^2)*sin(theta);

z2=z1+L*v;

if x2<=x(2) && x2>=x(1) && y2<=y(2) && y2>=y(1) && z2<=z(2) && z2>=z(1)

break;

end

Fiber(i,1)=x1;

Fiber(i,2)=y1;

Fiber(i,3)=z1;

Fiber(i,4)=x2;

Fiber(i,5)=y2;

Fiber(i,6)=z2;

end

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Answer 1

Constantino Carlos Reyes-Aldasoro 2023-1-11

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You are not running your loops correctly. If you ident your code (control-i) you can see better:

for i=1:1:N
    while 1
        x1=min(x)+(max(x)-min(x))*rand(1);
        y1=min(y)+(max(y)-min(y))*rand(1);
        z1=min(z)+(max(z)-min(z))*rand(1);
        theta=2*pi*rand(1);
        v=2*rand(1)-1;
        x2=x1+L*sqrt(1-v^2)*cos(theta);
        y2=y1+L*sqrt(1-v^2)*sin(theta);
        z2=z1+L*v;
        if x2<=x(2) && x2>=x(1) && y2<=y(2) && y2>=y(1) && z2<=z(2) && z2>=z(1)  
            break;
        end    
        
    end
    Fiber(i,1)=x1;
    Fiber(i,2)=y1;
    Fiber(i,3)=z1;
    Fiber(i,4)=x2;
    Fiber(i,5)=y2;
    Fiber(i,6)=z2;
end

You have a for loop, pressumably to run N times (no need to do 1:1:N, with 1:N will work), then "while 1" does not have a condition to check, it will always enter (https://uk.mathworks.com/help/matlab/ref/while.html) and then an if in which you do not do anything. Finally, I do not think that you need a loop here, you are only adding random numbers to x1,y1,z1, most probably you could do what you want without the for loop.