如何检查八度中是否定义了变量? [英] How to check if a variable is defined in Octave?

问题描述

在编写加载数据的脚本时，浪费时间等待每次加载.

When writing a script that loads data, it's a waste of time to wait for it to load each time.

如何检查变量是否已定义?

How to check to see if the variable is defined?

推荐答案

您可以使用Octave中的exist函数来完成这项工作.它可以用来检查给定名称是否作为变量，内置函数，文件或目录的存在.在这种情况下，要检查变量是否存在，可以使用如下代码:

You can use the exist function in Octave to do the work. It can be used to check the existence of given name as a variable, built in function, file, or directory. In you case, to check the existence of a variable, you may use something like this:

if (exist("your_var_name", "var") == 1)
    printf("varname exists");
else
    printf("varname not exists");
endif

您可以参考以下链接以获取详细信息:

You may refer the following links for detailed information:

• 内置功能:存在(名称，类型)
• 变量状态

• Built-in Function: exist (name, type)
• Status of Variables

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