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POFind the intersection of two arrays of structs in MATLAB
 

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  1. POFind the intersection of two arrays of structs in MATLAB
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    <p>I have an array of structs where I perform two searches. First I search for a specific colour and then I search for a specific city. I get two data sets containing the data I was looking for. So far, no problems.</p> <p>From the two data sets I get, I would like to find the structs in the two data sets that are present in both data sets.</p> <p>I have tried 'intersect', as this seemed to be a good option for arrays. But I do not seem not get any intersected data... Why not?</p> <p>The code looks something like this:</p> <pre><code>%Array of structs InfoArray(1) = struct ('Name','AAAA', 'City', 'London', 'Test', '70', 'FavouriteColor', 'red'); InfoArray(2)= struct('Name','BBBB', 'City', 'London', 'Test', '20', 'FavouriteColor', 'blue'); InfoArray(3)= struct('Name','CC', 'City', 'London', 'Test', '10', 'FavouriteColor', 'white'); InfoArray(4)= struct('Name','DD', 'City', 'Stockholm', 'Test', '30', 'FavouriteColor', 'yellow'); InfoArray(5)= struct('Name','EEEEE', 'City', 'Oslo', 'Test', '15', 'FavouriteColor', 'red'); InfoArray(6)= struct('Name','FFFF', 'City', 'Oslo', 'Test', '15', 'FavouriteColor', 'red'); InfoArray(7)= struct('Name','GG', 'City', 'Stockholm', 'Test', '80', 'FavouriteColor', 'blue'); InfoArray(8)= struct('Name','H', 'City', 'Oslo', 'Test', '60', 'FavouriteColor', 'pink'); InfoArray(9)= struct('Name','III', 'City', 'Oslo', 'Test', '5', 'FavouriteColor', 'red'); InfoArray(10)= struct('Name','JJJJ', 'City', 'Stockholm', 'Test', '40', 'FavouriteColor', 'blue'); InfoArray(11)= struct('Name','KKKK', 'City', 'London', 'Test', '70', 'FavouriteColor', 'white'); %Find structs in array with color: 'red' iColor = 'red'; [pFound,matchingFavouriteColors] = findPost(InfoArray,'FavouriteColor',iColor); %Find structs in array with City: 'London' iCity = 'London'; [pFound,matchingCity] = findPost(InfoArray,'City',iCity); %Find the structs that are found in both of the data sets ???? [c, ia, ib] = intersect(matchingFavouriteColors, matchingCity); disp([c; ia; ib]) function [matchFound, matchingData] = findPost(db,sField,iField) matches = find(strcmpi({db.(sField)},iField)); if(isempty(matches)) disp('No matches found'); postsFound=0; else matchingData = db(matches(:)); matchFound=length(matches); end </code></pre>
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    1. COThank you for pointing me in the 'direct' direction! I tend to mess up my programs with a lot of useless indirection. I have to remind myself again and again that Matlab is not C. I did not even realize that this was possible to perform with logical arrays. Amazing!
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