为非标量结构的每个元素的相同字段赋值 [英] Assign value to the same field of every element of non-scalar struct

问题描述

在 Matlab 中，可以使用

In Matlab, assigning cell arrays to a struct arrays field foo is possible with

my_array(1000).foo = [];
[my_array.foo] = some_cell{:};

现在我想做的是为数组中的所有字段分配一个值.但是无论我尝试什么，Matlab 都会返回错误消息，而不是默默地假设如果我想分配一个大小为 [1x1] 的元素，它应该分配给 all 字段.如果我可以简单地说例如:

Now what I would like to do is assign a single value to all fields in the array. But whatever I tried, Matlab would return error messages instead of silently assuming that if I want to assign a single element of size [1x1], it should be assigned to all fields. I would be happy if I could simply say e.g.:

my_array.foo = pi;
??? Incorrect number of right hand side elements in dot name assignment.
Missing [] around left hand side is a likely cause.

那么，如何将单个值分配给整个结构数组中的字段?

So, how can I assign a single value to a field all over a struct array?

推荐答案

您可以使用 deal 解决这个问题:

You can use deal to solve this problem:

my_array(1000).foo = [];
[my_array.foo] =deal(pi);

但是，请注意第二行中的方括号是将逗号分隔列表 my_array.foo 临时转换为向量所必需的.

However, note the square brackets in the second line with are necessary to temporarily convert the comma separated list my_array.foo into a vector.

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