MATLAB: In an assignment A(I) = B, the number of elements in B and I must be the same

for looplinspaceloop

Hello everyone! I'm having some issues trying to solve my code:

psi=[45*pi/180 50*pi/180 35*pi/180 40*pi/180];

for j=1:3;

    psii(j)=linspace(psi(j),psi(j+1),50);

end

I have lots of linearly spaced vectors. I need to creat loop to make easier my work. I got error as: In an assignment A(I) = B, the number of elements in B and I must be the same. I know it is an easy question but I am a new user. I tried to find solution by looking for similar questions. I didnt solved it unfortunately. Could you please help me?

If I use following codes I can solve it, but I need to create loop. psi1=linspace(psi(1),psi(2),50);

psi2=linspace(psi(2),psi(3),50);

psi3=linspace(psi(3),psi(4),50);

Thanks in advance.

Best Answer

Allow for a second dimension.

This works:

psii(j,:)=linspace(psi(j),psi(j+1),50);

It will give you a (3x50) matrix.

I also congratulate you for wanting to go with the matrix rather than with dynamic variables!

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MATLAB: How to Keep Nested For Loop Indexes From Equaling Each Other

Use the continue keyword.

for i=1:50
    for j=1:50
        if j==i
            continue; % breaks the inner for loop at the current iteration
        else
            % Do stuff here
            fprintf('i=%d, j=%d\n',i,j);
        end
    end
end

If this response answers your question, please click "accept this answer."

MATLAB: How to store a matrix output of a loop

     g=zeroes(4, 4, 7); %initial global frame

     for j=1:7 
        theta=q(j);
        alpha=al(j);
        LinkLength=a(j);
        LinkOffset=d(j);
        g(:, :, j) = [cos(theta),-sin(theta)*cos(alpha),sin(theta)*sin(alpha),LinkLength*cos(theta);
            sin(theta),cos(theta)*cos(alpha),-cos(theta)*sin(alpha),LinkLength*sin(theta);
            0,sin(alpha),cos(alpha),LinkOffset;
            0,0,0,1];
    end

Now g(:,:,k) will be the k'th matrix.

If you prefer,

     g = cell(7, 1); %initial global frame
     for j=1:7 
        theta=q(j);
        alpha=al(j);
        LinkLength=a(j);
        LinkOffset=d(j);
        g{j} = [cos(theta),-sin(theta)*cos(alpha),sin(theta)*sin(alpha),LinkLength*cos(theta);
            sin(theta),cos(theta)*cos(alpha),-cos(theta)*sin(alpha),LinkLength*sin(theta);
            0,sin(alpha),cos(alpha),LinkOffset;
            0,0,0,1];
    end

and then g{k} would be the k'th matrix.

Best Answer

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MATLAB: How to Keep Nested For Loop Indexes From Equaling Each Other

MATLAB: How to store a matrix output of a loop

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