Matlab字段名称索引 [英] Matlab Fieldnames indexing

问题描述

所以我有一个包含多个表的单元格数组，我正在尝试访问该表的第一列名称.

So I have a cell array with multiple tables and I am trying to access the first column name of the table.

c={'table1', 'table2', 'table3'}

以下两行都给我错误:

fieldnames(c{1})(1) 
fieldnames(c{1}){1}

Error: ()-indexing must appear last in an index expression.

但是，如果我执行以下操作，它将起作用:

But if I do following, it works:

fn=fieldnames(c{1})
fn{1}

有一种方法可以用一行代码来做到这一点，有人可以解释该错误吗?

Is there a way to do this with one line of code and can someone please explain the error?

推荐答案

通常，可以使用函数调用(仅返回输入的虚拟函数)解决此类问题，也可以仅用显式调用

Generally such problems can be solved using a function call (either a dummy function that just returns the input) or you could just replace the fn{} with an explicit call to subsref:

subsref(fieldnames(c{1}),substruct('{}',{1}));

关于您为什么会发生错误的问题-

Regarding your question about why the error happens - maybe this link could help.

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