在Matlab中设置向量的初始类型 [英] Set the initial type of a vector in Matlab

问题描述

我想声明一个空向量，该空向量接受用户定义类型的插入.在以下示例中，node是我用classdef node ...

I'd like to declare an empty vector that accepts insertion of user-defined types. In the following examples node is a type I've defined with classdef node ...

Matlab解释器拒绝以下代码，因为空向量会自动初始化为double类型，因此不能在其中插入node.

The following code is rejected by the Matlab interpreter because the empty vector is automatically initialized as type double, so it can't have a node inserted into it.

>> a = [];
>> a(1) = node(1,1,1);
The following error occurred converting from node to double:
Conversion to double from node is not possible.

下面的代码被接受，因为矢量是在其中用node初始化的，因此以后可以插入节点.

The code below is accepted because the vector is initialized with a node in it, so it can later have nodes inserted.

>> a = [node(1,1,1)];
>> a(1) = node(1,2,1);

但是，我想创建一个 empty 向量，该向量可以将节点插入其中.我可以这样笨拙地做到这一点:

However, I want to create an empty vector that can have nodes inserted into it. I can do it awkwardly like this:

>> a = [node(1,1,1)];
>> a(1) = [];

有什么更好的方法?我正在寻找将空向量的初始类型声明为node的东西.如果我可以组成语法，它将看起来像:

What's a better way? I'm looking for something that declares the initial type of the empty vector to be node. If I could make up the syntax, it would look like:

>> a = node[];

但这不是有效的Matlab语法.有什么好方法吗?

But that's not valid Matlab syntax. Is there a good way to do this?

推荐答案

可以创建空对象

A = MyClass.empty;

它适用于您的自己的班级，但也适用于 Matlab的班级，例如

It works with your own class, but also with Matlab's class such as

A = int16.empty;

此方法能够使用此语法创建多维空对象

This method is able to create multi-dimensional empty objects with this syntax

A = MyClass.empty(n,m,0,p,q);

只要一维设置为零.

请参见文档.

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