How to get rid of the for loop ?

Question

Robert Thiel 2015-9-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/241764-how-to-get-rid-of-the-for-loop

评论： Robert Thiel 2015-9-10

the task

    handles.plotdata.IR1 = zeros(1, 2001);
    handles.plotdata.IR2 = zeros(1, 2001);
    handles.plotdata.ax  = zeros(1, 2001);
    handles.plotdata.ay  = zeros(1, 2001);
    handles.plotdata.az  = zeros(1, 2001);

my simplification so far

 Kanal_name = {'IR1' 'IR2' 'ax' 'ay' 'az'};
 for n = 1:length(Kanal_name)
     handles.plotdata.(Kanal_name{n}) = zeros(1, 2001);
 end

now i want to get rid of the for loop, any suggestions ?

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James Tursa 2015-9-9

Why do you want to get rid of the loop?

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Answer 1

Kelly Kearney 2015-9-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/241764-how-to-get-rid-of-the-for-loop#answer_191829

在 MATLAB Online 中打开

Maybe this?

   tmp = cell(2,length(Kanal_name));
   tmp(1,:) = Kanal_name;
   [tmp{2,:}] = deal(zeros(1,2001));
   handles.plotdata = struct(tmp{:});

But this makes the code more difficult to read without adding any real benefit that I can see (the time difference is pretty negligible). Unless you have a definitive need to eliminate loops, I'd stick with your version.

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per isakson 2015-9-9

在 MATLAB Online 中打开

... or this

>> clear all
>> handles.plotdata = cell2struct( repmat({zeros(1, 2001)},1,5) ...
                               ,  {'IR1' 'IR2' 'ax' 'ay' 'az'}, 2 );
>> handles.plotdata
ans = 
    IR1: [1x2001 double]
    IR2: [1x2001 double]
     ax: [1x2001 double]
     ay: [1x2001 double]
     az: [1x2001 double]