MATLAB: For loop question

for loopvector

hello i'm trying tom make my for loop iterate 100,1000,10000 and 100000 times using this code

n=[1 2 3 4]
for i=1:1:100.^n
   r= i
end

for some reason it only iterates once can someone tell me why please and help me fix it

Best Answer

n = 1:4;
r = cell2mat(arrayfun(@(x)1:10*10^x,n,'un',0));

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MATLAB: Question

with axes

okay that was a lame joke. What do you mean divide?

doc mat2cell
doc blkproc %if Image Processing Toolbox

Please be more specific if you want more specific guidance.

MATLAB: Matrices question

You are writing to the element with index N and P, but their values are static and not effected by the loop. I assume, you want this:

vN = linspace(Phimin, Phimax, N)
for iN = 1:length(vN)
  Phi = vN(iN);
  G(iN)=Phi + BOC;
  C2(iN)=Rcon ./ ((Ccon .* cos(G(iN))) + (Scon .* sin(G(iN))));
  C1(iN)=Rmax^2 + (C2(iN) .* cos(G(iN) + Thetamax));
  A(iN)= (sqrt(abs(C1(iN)+C2(iN))) + sqrt(abs(C1(iN)-C2(iN))))./2;
  B(iN)=C2(iN) ./ (2.*A(iN));
    vP = linspace(Thetamin, Thetamax, P);
    for iP = 1:length(vP)
      Theta = vP(iP);
      F(iN,iP)= abs(((R(iP).*(M*g*L)) .*cos(Theta)) / ...
                    ((A(iN).*B(iN)) .* sin(G(iN)+Theta)));
      disp(F(iN,iP))
    end
  end

If this solves your problem, it can be made much faster: 1. Pre-allocate the vectors by zeros(1, length(vN)) and zeros(length(vN), length(vP)). And move all repeated calculation before the loops. E.g. the creation of vP, M*g*L.*cos(Theta) etc. But I'm not going to optimize your code, as long as I do not know, if it matchs your needs at all.

Best Answer

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MATLAB: Question

MATLAB: Matrices question

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