How to add values to structure array without loop

2015 12 8
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更新时间：2018 11 24
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Consider the following loop:
values = [2 5 6 4 8 9 10 5 15 7]
for i=1:10
arr(i).myfield = values(i);
end
How can this be done without loop?
Thank you.

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Walter Roberson
Walter Roberson 2015-12-8

1 个投票

T = struct('myfield', num2cell(values));
arr(1:length(T)) = T;
In the special case that arr does not already exist, it can be done with the one line
arr = struct('myfield', num2cell(values));

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Durga Lal Shrestha
Durga Lal Shrestha 2015-12-8
Thanks Walter. But arr already exists with other fields. For example
arr(1).myfield1=10;
arr(2).myfield1=20;
arr(3).myfield1=30;
And I want to add another field myfield2 with values as below
values = [100 200 300];
for i=1:3
arr(i).myfield2 = values(i);
end
When I used your code
T = struct('myfield2', num2cell(values));
arr(1:length(T)) = T;
I got the following error message
Subscripted assignment between dissimilar structures.
Walter Roberson
Walter Roberson 2015-12-8
T = num2cell(values);
[arr(1:10).myfield2] = T{:};
It is necessary to use two lines for this.

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