MATLAB: I have this error “In an assignment A(I) = B, the number of elements in B and I must be the same.”

My code is like

I=zeros(1,5);
    for i=1:4
    [ma,I(i)]=max(areas);
end

Error: "In an assignment A(I) = B, the number of elements in B and I must be the same." [ma,I(i)]=max(areas); the second argument y in [x,y]=max(a) is a single element and I am trying to send single element only right?

Best Answer

max() of a 2D array results in a vector, not a scalar. The indices of that would not fit in the single location I(i)

You should be asking yourself why you are doing the same thing in every iteration of the loop. max(areas) is not going to change in the loop.

Why are you allocating 5 locations but only looping to 4?

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MATLAB: How to round elements in a vector to pre-defined intervals

Putting Adam's response as an answer instead of a comment, and explaining it in a bit more detail:

In the first and second part of the "if" statement, you have this bit of code

gradesRounded = -3;

instead of this bit of code:

gradesRounded(i) = -3;

which means that you are over-writing your entire vector with a single number, instead of writing to each element of the vector.

MATLAB: Hi i attached simple code,i need to store every result from for loop on each iteration,please see the code and alter it sir.

nt = length(t);
for i = 1:4
  g = zeros(nt,1);
  for j = 1:nt
    g(j) = i + t(j);
  end
  l(i) = max(g);
end

or more simply

for i = 1 : 4
  g = i + t;
  l(i) = max(g);
end

Best Answer

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MATLAB: How to round elements in a vector to pre-defined intervals

MATLAB: Hi i attached simple code,i need to store every result from for loop on each iteration,please see the code and alter it sir.

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