Need help with importing database with text field in Regressiontree

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

Answer 1

[Tom Lane]

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.