How can I extract a specific field from each element of a Matlab struct array?
如何从Matlab结构数组的每个元素中提取特定字段?
>> clear x
>> x(1).a = 6;
>> x(2).a = 7;
I'd like an array containing 6 and 7. Neither x(:).a nor x.a do what I want.
我想要一个包含6和7的数组。无论是x(:)。还是x.a都不能做我想要的。
>> x(:).a
ans =
6
ans =
7
3 个解决方案
#1
9
No problem - just use :
没问题 - 只需使用:
arr = [x.a];
It will concat all of the values that you need. If you have a more complex data, you can use the curly bracers:
它将连接您需要的所有值。如果您有更复杂的数据,可以使用大括号:
b(1).x = 'John';
b(2).x = 'Doe';
arr = {b.x};
#2
0
Sadly, I am almost sure that MATLAB has no nice way of doing what you want. You will have to either use a for loop to construct a new array, or else go back and redesign your data structures. For example you might be able to use a struct-of-arrays rather than an array-of-structs.
可悲的是,我几乎可以肯定MATLAB没有办法做你想做的事。您将不得不使用for循环来构造新数组,或者返回并重新设计您的数据结构。例如,您可以使用结构数组而不是结构数组。
#3
0
For a multi-dimensional array, you need
对于多维数组,您需要
reshape([x.a], size(x))
#1
9
No problem - just use :
没问题 - 只需使用:
arr = [x.a];
It will concat all of the values that you need. If you have a more complex data, you can use the curly bracers:
它将连接您需要的所有值。如果您有更复杂的数据,可以使用大括号:
b(1).x = 'John';
b(2).x = 'Doe';
arr = {b.x};
#2
0
Sadly, I am almost sure that MATLAB has no nice way of doing what you want. You will have to either use a for loop to construct a new array, or else go back and redesign your data structures. For example you might be able to use a struct-of-arrays rather than an array-of-structs.
可悲的是,我几乎可以肯定MATLAB没有办法做你想做的事。您将不得不使用for循环来构造新数组,或者返回并重新设计您的数据结构。例如,您可以使用结构数组而不是结构数组。
#3
0
For a multi-dimensional array, you need
对于多维数组,您需要
reshape([x.a], size(x))