Multiplication of vectors in for loops

Question

Jade T 2023-2-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1913265-multiplication-of-vectors-in-for-loops

编辑： Voss 2023-3-1

Hi all,

I am wondering how to make this for loop work. Each radius value results in a vector product containing 3 numbers. I wanted those three numbers to occupy each row ( so that each row is a new vector from each radius multiplication ).

radius = [3,3] % contains 9 different values
Tdims= zeros(9,3)
for i = 1: length(radius)
    for j= radius
        Tdims(j,i)= sin (anglesRad) .* radius (j) + ycenter - 100 % each vector product is its own row
    end
end

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Answer 1

Voss 2023-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/1913265-multiplication-of-vectors-in-for-loops#answer_1172410

在 MATLAB Online 中打开

Possibly this:

radius = rand(3,3); % contains 9 different values
ycenter = 0;
anglesRad = [0 1 2]; % I guess this is a 1-by-3 vector based on your description
nr = numel(radius);
na = numel(anglesRad);
Tdims = zeros(nr,na);
for i = 1:nr
    Tdims(i,:) = sin(anglesRad) .* radius(i) + ycenter - 100; % each vector product is its own row
end
disp(Tdims);
 -100.0000  -99.3458  -99.2931
 -100.0000  -99.8789  -99.8691
 -100.0000  -99.8605  -99.8493
 -100.0000  -99.3679  -99.3170
 -100.0000  -99.9411  -99.9364
 -100.0000  -99.2905  -99.2334
 -100.0000  -99.9297  -99.9240
 -100.0000  -99.3072  -99.2513
 -100.0000  -99.3274  -99.2732

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Jade T 2023-2-15

Excellent, I actually can understand what you did here, and you caught that the center needed to be specified outside the loop. Much appreciated

Voss 2023-2-15

编辑：Voss 2023-3-1

You're welcome!

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Answer 2

Sulaymon Eshkabilov 2023-2-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1913265-multiplication-of-vectors-in-for-loops#answer_1172415

编辑：Sulaymon Eshkabilov 2023-2-15

在 MATLAB Online 中打开

If understood your question correctly, this is how you can get it done:

radius = randi(10, 3, 3); % contains 9 different values
ycenter = 1;
anglesRad = deg2rad([30, 60 90]);
Tdims= zeros(size(radius));
for ii = 1:size(radius,1)
    for jj= 1:size(radius,2)
        Tdims(ii,jj)= sin(anglesRad(ii))* radius (ii,jj) + ycenter - 100; % each vector product is its own row
    end
end
Tdims
Tdims = 3×3
  -97.5000  -96.0000  -97.5000
  -90.3397  -98.1340  -96.4019
  -90.0000  -90.0000  -91.0000