How to insert vector into a Matrix?

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Andrea Brocchi 2019-7-15

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评论： Alex Mcaulley 2019-7-16

Hi, I do a while cycle, into this while i have a method to create a vector with random number (using randi). At the end of this while cycle i have a vector with all the casual number. This while cycle is in turn within another while cycle which is repeated 4 times, but every 4 times in my matrix i have the same values. I show for you my code:

For example: if in 1 cycle i have generate this vector: [1 2 3 4], this same numbers appair also in the other raw of matrix final.

nSim=1
while nSim<5
  while t<nmax
    Number=randi([0 9],1,1);
    Vector(t)=Number;
    t=t+1
  end
  addVector=[Vector];
  MatrixFinal( end+1, :) = addVector;
  nSim=nSim+1;
end

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Alex Mcaulley 2019-7-15

在 MATLAB Online 中打开

Do you know that you can do it in just one line?:

MatrixFinal = randi([0,9],4,nmax-1)

Andrea Brocchi 2019-7-15

Yes, but i have to do a lot of calculations with the numbers generated (i don't report here the code with the calculations).

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回答（1 个）

Alex Mcaulley 2019-7-15

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在 MATLAB Online 中打开

Well, If you want to follow your current code, to obtain what you want yo just need to initialize t before the while:

nSim=1
while nSim<5
t = 1; %This line
while t<nmax
          Number=randi([0 9],1,1);
          Vector(t)=Number;
t=t+1
end
addVector=[Vector];
MatrixFinal( end+1, :) = addVector;
nSim=nSim+1;
end

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Andrea Brocchi 2019-7-15

在 MATLAB Online 中打开

I insert before the first while; if I insert in the position that you say give me this error:

Unable to perform assignment because the size of the left side is 1-by-4319 and
the size of the right side is 1-by-8638.

Alex Mcaulley 2019-7-16

Upload the full code you are using, it is difficult for us to guess without more information. Putting the initialization of t before the first while dosen't give you the desired results because the loop on t is not executed after the first iteration of the first while loop, then the repeated sequence.

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