Keep new array from overwriting in loop

Question

Carman 2017-3-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/330262-keep-new-array-from-overwriting-in-loop

评论： Greg Dionne 2017-3-17

Hi everyone, I have a problem in my code that is overwriting my new array every time the for loop iterates. I want it to add on to the bottom, so I have all the files that work with the 'if' statement. I would like 'inflowsoundings' to keep all the 'inputfilename's that run through correctly but it currently overwrites the values. Here is my code with the first loop and the problem is in the last for loop:

 for i = 1:size(Tor_Time,1)
    midpt_lat(i) = Tor_Time(i,20);
    midpt_lon(i) = 180 + (180-abs(Tor_Time(i,21)));
    %Names midpoints of storm locations (also converts West longitudes to East longitudes)
    for j = 1:size(Stat_Loc,1)
        middistance_deg(i,j)=distance(midpt_lat(i),midpt_lon(i),Lat(j),Long(j));
        %
        middistance(i,j)=distdim(middistance_deg(i,j),'deg','km');
    end
    %Calculates distance from storm to all station locations then converts
    %degrees to kilometers
     index_400_middist = find(middistance(i,:)<=400.0);
     % find indexes stations within 400 km of the midpoint of event
     Stat_IDs_400 = Stat_IDs(index_400_middist,3);
     % Gives stations that are <= 400km from storm  
     filename = ['stormID_storm' num2str(i) '_' num2str(Tor_Time(i,3)) '_' num2str(Tor_Time(i,4)) '.mat'];
     % Names all stations that are within 400km of each storm in .mat files
     % (each storm has a different .mat file)
     save(filename,'Stat_IDs_400') 
     for f = 1:length(Stat_IDs_400)
         inputfilename = [num2str(Tor_Time(i,3)),'_',num2str(Tor_Time(i,4)),'_',char(Stat_IDs_400(f)),'.xlsx'];
         inputfile = [pwd,'\StormSoundings\',inputfilename];
         if exist(inputfile, 'file') == 2
             [avgcdt,az] = inflowsector(inputfilename,midpt_lat(i),midpt_lon(i));
         else
             inputfile;
             avgcdt = NaN;
             az = NaN;
         end
         %
         if az>=(avgcdt-75) | az<=(avgcdt+75)
            inflowsoundings{f,:}=inputfilename; %Tor_Time(1,:);
         else
            inflowsoundings{f} = NaN;
         end
     end
     % MAKE CAPE CALCULATIONS
 end
Any help is greatly appreciated. Thanks!

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Answer 1

Greg Dionne 2017-3-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/330262-keep-new-array-from-overwriting-in-loop#answer_259086

在 MATLAB Online 中打开

You can try this:

if az>=(avgcdt-75) | az<=(avgcdt+75)
   inflowsoundings{end+1}=inputfilename; 
end

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Carman 2017-3-17

It is defining the fcn in that instance and your solution gives the error that 'inflowsoundings' is undefined.

Greg Dionne 2017-3-17

在 MATLAB Online 中打开

Then you'll need to initialize it outside the for-loop.

inflowsoundings = cell(1,0)

Then you can assign in your loop.

For example:

>> inflowsoundings = cell(0,1)
inflowsoundings =
    0×1 empty cell array
>> inflowsoundings{end+1} = 'alpha'
inflowsoundings =
    cell
      'alpha'
>> inflowsoundings{end+1} = 'beta'
inflowsoundings =
    1×2 cell array
      'alpha'    'beta'
>> inflowsoundings{end+1} = 'gamma'
inflowsoundings =
    1×3 cell array
      'alpha'    'beta'    'gamma'