Initializing Array of Structures/Objects
显示 更早的评论
I simply want to set each struct in a struct-array. I set structarray to [] as it is an object property in my case, where it is being initialized as emtpy array. My first approach looks like:
structarray = [];
for i=1:10
structarray(i) = struct('index', i);
end
I get the following error: 'The following error occurred converting from struct to double: Error using double Conversion to double from struct is not possible.'
I can use an if else check and set the first element by:
structarray = struct('index', i);
On http://www.ece.northwestern.edu/CFS/local-apps/matlabhelp/base/relnotes/matlab/matlab1212.html it reports that setting structarray(1) throws this error.
Is there any easy way to write this straightforward similar to my code above?
采纳的回答
Geoff Hayes
2015-9-5
Sven - why not use arrayfun to apply a function to each element in the array. In this case, your function would create a struct with a single field called index where its value is assigned its position/index within the array. The following should do what you require
myStructArray = arrayfun(@(x)struct('index',x),1:10)
Note how the first input to arrayfun is the function that creates the struct given an input parameter. The value of each parameter is determined from the second input to arrayfun - an array of indices from one to ten.
Try the above and see what happens!
3 个评论
mary
2022-11-17
How this can be done if there are for instance two fields?
Something like:
myStructArray = arrayfun(@(x)struct('index1',x),zeros(1,10))
myStructArray = arrayfun(@(x)struct('index2',x),zeros(1,10))
will replace the first field by the second one. The idea is to keep both index1 and index2.
myStructArray = arrayfun(@(i1,i2)struct('index1',i1,'index2',i2),zeros(1,10),zeros(1,10))
mary
2022-11-17
I found the answer:
myStructArray = arrayfun( @(x)struct('index1',x,'index2',x),zeros(1,10) )
更多回答（1 个）
Walter Roberson
2015-9-6
structarray = struct('index', repmat({[]}, 1, 10));
类别
在 帮助中心 和 File Exchange 中查找有关 Structures 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
