help using bsxfun to multiplay different size matrixes

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barak messica 2024-5-20

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https://ww2.mathworks.cn/matlabcentral/answers/2120521-help-using-bsxfun-to-multiplay-different-size-matrixes

评论： barak messica 2024-5-20

采纳的回答： Stephen23

在 MATLAB Online 中打开

I want to make the following:

create a matrix that has one more diamention the the matrix norm_mode (actuatty is to make a norm_mode a time function)

to accelrate it on matlab I tryied the use of bsxfun, but I get the error : "Non-singleton dimensions of the two input arrays must match each other."

Please help me fix it, I cant tell where the problem is.

tmp = zeros(newSize, newSize, length(others.t));
for idx_t = 1:length(t)
  tmp(:,:,idx_t) = norm_mode(:,:) .* fields(idx_t,3) ;
end
tmp = bsxfun(@times, norm_mode, fields(:, ii));

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Answer 1

Stephen23 2024-5-20

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https://ww2.mathworks.cn/matlabcentral/answers/2120521-help-using-bsxfun-to-multiplay-different-size-matrixes#answer_1460111

编辑：Stephen23 2024-5-20

在 MATLAB Online 中打开

tmp = bsxfun(@times, norm_mode, reshape(fields(:,3),1,1,[]))

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barak messica 2024-5-20

在 MATLAB Online 中打开

Thanks for the help

when I'm trying to apply it, I get the error "Size can only have one unknown dimension" for the reshape function.

I will add the all function mybe it will be clearer

function total_field = BuildSpatialField(fields,fiber, sim, others)
t = others.t;
lambda = sim.lambda0;
% downsample the spatial picture by a factor of n^2
n = 4;
 if mod(others.Nx, n) ~= 0
        error('Matrix size must be divisible by n');
 end
 newSize = others.Nx / n;
% TODO: add all z
total_field = zeros( newSize, newSize, length(others.t) ); % total_field(X,Y,t)
h = waitbar(0, 'calculate field...');
% TODO: try using parfor loop
    for ii=1:others.modes
        % load mode spashial profile
        fname=[fiber.MM_folder 'radius' strrep(num2str(fiber.radius), '.', '_') 'boundary0000fieldscalar'...
                'mode' num2str(ii,'%03.f') 'wavelength' strrep(num2str(lambda*1e9), '.', '_')];
        phi = load([ fname '.mat'], 'phi');
        phi = phi.phi;
		
		phi_downsampled = downsample_matrix(phi, n);
        % normalize the field norm
        norm_mode = (phi_downsampled) ./ sqrt((sum(sum(abs(phi_downsampled).^2))));
        % tmp = zeros(newSize, newSize, length(others.t));
        % for idx_t = 1:length(t)
        %     tmp(:,:,idx_t) = norm_mode(:,:) .* fields(idx_t,ii) ;
        % end
        tmp = bsxfun(@times, norm_mode, reshape(fields(:,ii),[],[],1));
        total_field = total_field + tmp;
        waitbar(ii/others.modes, h, ['mode ' num2str(ii) ' from ' num2str(others.modes)]);
    end
    close(h);
end

Stephen23 2024-5-20

@barak messica: I edited my answer.

barak messica 2024-5-20

Works

Thanks :)

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help using bsxfun to multiplay different size matrixes

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