Combining two arrays question
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Hello. I have a structure array 'data', and I am trying to define a new variable called 'loc'. The problem I am encountering is that I want to get for example, when I write something like loc(1) in the command window, I get [data(1).Lat data(1).Lng].
The following is the code I am using.
for n = 1 : length(data)
if ~isempty(data(n).Lat & data(n).Lng)
loc(n) = [data(n).Lat data(n).Lng];
end
end
I have just started using Matlab and will greatly appreciate your help. Thanks in advance.
采纳的回答
You should learn to program without trying on loops for everything: this will be faster and neater code in MATLAB, and is called vectorization. In this case there is no need for any loops or arrayfun calls, just use MATLAB's inbuilt structure accessing syntax:
>> A(3).lat = 1.3;
>> A(3).lng = 0.3;
>> A(2).lat = 1.2;
>> A(2).lng = 0.2;
>> A(1).lat = 1.1;
>> A(1).lng = 0.1;
>> [[A.lat]',[A.lng]']
ans =
1.1 0.1
1.2 0.2
1.3 0.3
Read more here:
更多回答（1 个）
Andrei Bobrov
2015-5-25
loc1 = permute(struct2cell(data),[3,1,2]);
Loc = arrayfun(@(ii)[loc1{ii,:}],(1:size(loc1,1))','un',0);
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