Hello everyone. I have a file .data and I need to convert it to an array. How can this be done?

Question

Axel 2022-9-18

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https://ww2.mathworks.cn/matlabcentral/answers/1807295-hello-everyone-i-have-a-file-data-and-i-need-to-convert-it-to-an-array-how-can-this-be-done

回答： Chunru 2022-9-18

I opened the file using "importdata" function, but it was created as a cell and I need it to be an array because I will applying the Principal component analysis.

The data in this file appears in this format

'5.1,3.5,1.4,0.2,Iris-setosa'

'4.9,3.0,1.4,0.2,Iris-setosa'

'4.7,3.2,1.3,0.2,Iris-setosa'

'4.6,3.1,1.5,0.2,Iris-setosa'

I'm using the Iris flower data set or Fisher's Iris data set, this is a multivariate data set that consists of 50 samples from each of three species of Iris (Iris setosa, Iris virginica and Iris versicolor).

Link for dataset: https://archive.ics.uci.edu/ml/datasets/iris

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Answer 1

Chunru 2022-9-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1807295-hello-everyone-i-have-a-file-data-and-i-need-to-convert-it-to-an-array-how-can-this-be-done#answer_1055675

在 MATLAB Online 中打开

websave("iris.dat", "https://archive.ics.uci.edu/ml/machine-learning-databases/iris/iris.data")
ans = '/users/mss.system.N88I3a/iris.dat'
x = readtable("iris.dat")
x = 150×5 table
Var1Var2Var3Var4Var5_______________________________

1     3.5     1.4     0.2     {'Iris-setosa'}
9       3     1.4     0.2     {'Iris-setosa'}
7     3.2     1.3     0.2     {'Iris-setosa'}
6     3.1     1.5     0.2     {'Iris-setosa'}
   3.6     1.4     0.2     {'Iris-setosa'}
4     3.9     1.7     0.4     {'Iris-setosa'}
6     3.4     1.4     0.3     {'Iris-setosa'}
   3.4     1.5     0.2     {'Iris-setosa'}
4     2.9     1.4     0.2     {'Iris-setosa'}
9     3.1     1.5     0.1     {'Iris-setosa'}
4     3.7     1.5     0.2     {'Iris-setosa'}
8     3.4     1.6     0.2     {'Iris-setosa'}
8       3     1.4     0.1     {'Iris-setosa'}
3       3     1.1     0.1     {'Iris-setosa'}
8       4     1.2     0.2     {'Iris-setosa'}
7     4.4     1.5     0.4     {'Iris-setosa'}