本文介绍了无法从表创建数组的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试使用MATLAB加载外部CSV文件.
I'm trying to load an external CSV file using MATLAB.
我设法使用webread
下载了该文件,但我只需要其中一部分即可.
I managed to download it using webread
, but I only need a subset of the columns.
我尝试过
Tb = webread('https://datahub.io/machine-learning/iris/r/iris.csv');
X = [sepallength sepalwidth petallength petalwidth];
但是我不能以这种方式形成X
,因为无法识别名称.如何正确创建X
?
But I cannot form X
this way because the names are not recognized. How can I create X
correctly?
推荐答案
行
Tb = webread('https://datahub.io/machine-learning/iris/r/iris.csv');
产生一个具有列名的table
对象,您稍后尝试访问,就好像它们是工作区变量一样,不是.相反,您应该修改代码以使用:
Produces a table
object with column names you later try to access as if they were workspace variables - which they aren't. Instead, you should modify your code to use:
X = [Tb.sepallength Tb.sepalwidth Tb.petallength Tb.petalwidth];
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