classify

Hi!

I have some troubles understanding how to use the classify matlab function.

So the function is as follow:

[class, err] = classify (sample, training, group)

where:
- sample contains the data we want to classify
- training contains the data that we know to which group they belong to
- group contains the group id to which belongs each row of training
- class contains the group id to which belongs each row of sample

oki?

But then here are my questions:
1. sample and training have the same number of columns so does that mean that each column belongs to a single specific feature?
2. how the error rate "err" is found as we do not give in input the "class" variable that we were expected?

Thanks in advance for your help
Sophie
.

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