string 创建具有字符串名称的变量
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Create variables with names from strings
提问by Potaito
Let's assume that I want to create 10 variables which would look like this:
假设我想创建 10 个如下所示的变量：
x1 = 1;
x2 = 2;
x3 = 3;
x4 = 4;
.
.
xi = i;
This is a simplified version of what I'm intending to do. Basically I just want so save code lines by creating these variables in an automated way. Is there the possibility to construct a variable name in Matlab? The pattern in my example would be ["x", num2str(i)]. But I cant find a way to create a variable with that name.
这是我打算做的简化版本。基本上我只想通过以自动方式创建这些变量来保存代码行。是否有可能在 Matlab 中构造变量名？我的例子中的模式是["x", num2str(i)]. 但是我找不到创建具有该名称的变量的方法。
回答by Dan
回答by bdecaf
I also strongly advise using a cell array or a struct for such cases. I think it will even give you some performance boost.
我还强烈建议在这种情况下使用元胞数组或结构体。我认为它甚至会给你一些性能提升。
If you really need to do so Dan told how to. But I would also like to point to the genvarnamefunction. It will make sure your string is a valid variable name.
如果你真的需要这样做，丹告诉了如何去做。但我也想指出这个genvarname功能。它将确保您的字符串是有效的变量名称。
EDIT: genvarname is part of core matlab and not of the statistics toolbox
编辑：genvarname 是核心 matlab 的一部分，而不是统计工具箱的一部分
回答by MasterJedi
for k=1:10
assignin('base', ['x' num2str(k)], k)
end
回答by eyalsoreq
Although it is long overdue, i justed wanted to add another answer.
虽然早就应该了，但我只是想添加另一个答案。
the function genvarname is exactly for these cases
函数 genvarname 正是针对这些情况
and if you use it with a tmp structure array you do not need the eval cmd
如果您将它与 tmp 结构数组一起使用，则不需要 eval cmd
the example 4 from this link is how to do it http://www.mathworks.co.uk/help/matlab/ref/genvarname.html
此链接中的示例 4 是如何操作http://www.mathworks.co.uk/help/matlab/ref/genvarname.html
for k = 1:5
t = clock;
pause(uint8(rand * 10));
v = genvarname('time_elapsed', who);
eval([v ' = etime(clock,t)'])
end
all the best
祝一切顺利
eyal
艾尔
回答by Potaito
If anyone else is interested, the correct syntax from Dan's answer would be:
如果其他人有兴趣，Dan 的答案中的正确语法是：
eval(['x', num2str(i), ' = ', num2str(i)]);
My question already contained the wrong syntax, so it's my fault.
我的问题已经包含错误的语法，所以这是我的错。
回答by Fabian Jonsson
I needed something like this since you cannot reference structs (or cell arrays I presume) from workspace in Simulink blocks if you want to be able to change them during the simulation.
我需要这样的东西，因为如果您希望能够在模拟期间更改它们，则无法从 Simulink 块中的工作区引用结构（或我假设的元胞数组）。
Anyway, for me this worked best
无论如何，对我来说这最有效
assignin('base',['string' 'parts'],values);
