value index 0 out of range (0 - -1) at attribute no 4 (d)

[ziqilau]

I am dealing with continuous features and discrete class_var, i.e.

atts = ['a','b','c','d']
domain = Orange.data.Domain([Orange.feature.Continuous(x) for x in atts[:-1]] +
                            [Orange.feature.Discrete(atts[-1])])
data = Orange.data.Table(domain)
data.append([1,2,3,0])

However, it said "value index 0 out of range (0 - -1) at attribute no 4 (d)". Please help!

[kernc]

Don't know whether .append() will work, but if atts[-1] is class, you want to construct your domain like so:

domain = Orange.data.Domain([Orange.feature.Continuous(x) for x in atts[:-1]],
                            [Orange.feature.Discrete(atts[-1])])

[kernc]

And if you're actually working with the current Orange 3 version, its repository is here: https://github.com/biolab/orange3

[ales-erjavec]

You need to pass a list of values the discrete variable can represent. i.e. Orange.feature.Discrete("Name", values=["First", "Second", "Third"])