Creating a binary file using fwrite

Question

Meghan 2016-10-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/309090-creating-a-binary-file-using-fwrite

评论： Meghan 2016-10-25

Hello

I'm wondering if anyone can help me. I don't have any experience creating binary files or doing what I need to do so this might be a silly question :)

I have a 3D matrix, 24x10x24 (time X layers X nodes). I'm trying to write a for loop for that it runs through the 10 layers with both time and nodes being 1, then I need it to run through each each layer with time being 1 and nodes being 2, and so on for each node. e.g

% [Double] U(1,1,1)
% [Double] V(1,1,1)
% ...[Double] U(nLayers,1,1)
% [Double] V(nLayers,1,1)
% [Double] U(1,2,1)
% [Double] V(1,2,1)
% ...[Double] U(nLayers,2,1)
% [Double] V(nLayers,2,1)
% ... ... ...[Double] U(nLayers,nNodes,1)
% [Double] V(nLayers,nNodes,1)
% [Double] U(1,1,2)
% [Double] V(1,1,2)
% ...[Double] U(nLayers,1,2)
% [Double] V(nLayers,1,2)
% [Double] U(1,2,2)
% [Double] V(1,2,2)
% ...[Double] U(nLayers,2,2)
% [Double] V(nLayers,2,2)
% ... ... ...[Double] U(nLayers,nNodes,2)
%   [Double] V(nLayers,nNodes,2)

I've written some code, but I don't think its right at all since I can't really wrap my head around what I need to do anyway. And I probably haven't explained myself very well. If anyone has any ideas, I would really welcome them :)

Code so far (very wrong):

for lp=1:length(nLayers);
    fwrite(fileID,FV.u(1,lp,1),'double','ieee-be');
    fwrite(fileID,FV.v(1,lp,1),'double','ieee-be');
    for lq=1:length(nNodes);
    fwrite(fileID,FV.u(1,lp,lq),'double','ieee-be');
    fwrite(fileID,FV.v(1,lp,lq),'double','ieee-be');
    for lt=1:length(nTimeStep);
        fwrite(fileID,FV.u(lt,lp,lq),'double','ieee-be');
        fwrite(fileID,FV.v(lt,lt,lp),'double','ieee-be');
    end
end

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Answer 1

Walter Roberson 2016-10-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/309090-creating-a-binary-file-using-fwrite#answer_240620

Your code writes u(1,lp,1) and then writes it again as the first element of u(1,lp,lq)

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Walter Roberson 2016-10-25

If you are using Linux or OS X then you can use "od" to examine the contents of the binary file

Meghan 2016-10-25

Sorry I realised that I'd already written the code and got the answer I wanted. I just had it a bit fuzzy. Never written anything to binary before so a little all over the place!

Thanks for the help anyway :)

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