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Need help with importing database with text field in Regressiontree

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mohamed mizan
mohamed mizan 2014-8-20
关闭： MATLAB Answer Bot 2021-8-20
i have database car and i have field michenicname and location how can i use carname ?
I have tried X=[michenicname location Horsepower Weight]
load carsmall % contains Horsepower, Weight, MPG X = [Horsepower Weight]; rtree = fitrtree(X,MPG)
http://www.mathworks.co.uk/help/stats/classification-trees-and-regression-trees.html#bsw6p25 can anyone help please

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Tom Lane
Tom Lane 2014-8-23
You don't say what your data looks like and what problem you are having.
I'm guessing the michenicname variable is text and that's why you're having a problem. You can't concatenate that with numeric variables. Your best bet may be to code the unique string values as group numbers. The grp2idx function may be helpful.

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