I want to store the output from my nested for loop in a matrix . How can it be done?

Question

vinay mhatre 2017-5-26

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评论： vinay mhatre 2017-5-26

Bw=[150 155];
Rbwtobtf=[0.2,0.21];
Hf=[70 75];
Rdtoh=[0.85 0.86];
Tbf=[115 120];
Bbf= [250 260];
Mu=3400000000;
Fcu=50;
Rdtoh=[0.85 0.86];
Tbf=[115 120];
Bbf=[250 260];
for i=1:length(Bw)
    for j=1:length(Rbwtobtf)
        for k=1:length(Hf)
            for l= 1:length(Rdtoh)
                for m= 1:length(Tbf)
                    for n= 1: length(Bbf)
                         Btf=Bw(i)/Rbwtobtf(j);
                         syms x;
                         d=solve(Mu==Fcu*Btf*x^2*(0.157*Rbwtobtf(j)+(1-Rbwtobtf(j))*(Hf(k)/x)*(0.45-0.225*(Hf(k)/x))),x);
                         D=vpa(d);
                         De=D(1);
                         h= De/Rdtoh(l);
                         A1 = Btf*Hf(k);% Area of top flange
                         Hw = h-Hf(k)-Tbf(m);
                         A2 = Bw(i)*Hw; %Area of web
                         A3 = Bbf(n)*Tbf(m); %Area of bottom flange
                         A = A1+A2+A3; %Total area
                         disp (A);
                         n=n+1;
                      end
                      m=m+1;
                  end
                  l=l+1;
              end
              k=k+1;
          end
          j=j+1;
      end
      i=i+1;
  end

I want to store values of A in a matrix. please help.

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Stephen23 2017-5-26

It seems like most/all of this could be vectorized quite easily:

https://www.mathworks.com/help/matlab/matlab_prog/vectorization.html

That would be simpler and faster too.

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Answer 1

MathReallyWorks 2017-5-26

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在 MATLAB Online 中打开

Hello Vinay,

Firstly, Make the code readable. It will be easy for us to solve your problem.

Anyways, your problem seems to be of multi dimensional array.

Use

A(n,m,l,k,j,i) = A1+A2+A3; %Total area

or

A(i,j,k,l,m,n) = A1+A2+A3; %Total area

in your code for storing the data in A.

Suggestion: Remove disp(A) which is just below this line.

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vinay mhatre 2017-5-26

it is not giving me a single matrix. I am getting multiple matrices while running the code. I want a single matrix with 64 rows in one column

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Answer 2

Andrei Bobrov 2017-5-26

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/342029-i-want-to-store-the-output-from-my-nested-for-loop-in-a-matrix-how-can-it-be-done#answer_268515

编辑：Andrei Bobrov 2017-5-26

在 MATLAB Online 中打开

[EDIT]

Bw=[150 155];
Rbwtobtf=[0.2,0.21];
Hf=[70 75];
Rdtoh=[0.85 0.86];
Tbf=[115 120];
Bbf= [250 260];
Mu=3400000000;
Fcu=50;
[a,b,c0] = ndgrid(Hf,Rbwtobtf,Bw);
c = [c0(:),b(:),a(:)];
r0 = Fcu*c(:,1);
r = 9*r0.*c(:,3).*( 1./c(:,2) - 1);
p = [(157*r0)/1000, r/20, - Mu - r.*c(:,3)/40];
s = size(p,1);
dd = zeros(s,1);
for ii = 1:s
    q = roots(p(ii,:));
    dd(ii) = q(1);
end
[a,b,c0,n] = ndgrid(Bbf,Tbf,Rdtoh,1:s);
c = [c(n(:),:),c0(:),b(:),a(:)];
AA = c(:,1).*(c(:,3)./c(:,2) + dd(n(:))./c(:,4) - c(:,3) - c(:,5)) + c(:,6).*c(:,5);

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Andrei Bobrov 2017-5-26

Thank you Stephen!

vinay mhatre 2017-5-26

the output of this program is giving me the desired matrix. but the values are wrong. The code which i have written gives me correct answer but the answer is not in the form of matrix. kindly help. thank you

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