matlabcsvimportsubsetmatlab-table

Unable to create an array from a table

I'm trying to load an external CSV file using MATLAB.

I managed to download it using webread, but I only need a subset of the columns.

I tried

Tb = webread('https://datahub.io/machine-learning/iris/r/iris.csv');     
X = [sepallength sepalwidth petallength petalwidth];

But I cannot form X this way because the names are not recognized. How can I create X correctly?

Solution

  • The line

    Tb = webread('https://datahub.io/machine-learning/iris/r/iris.csv');

    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];