what's the difference between rsenc and comm.RSDecoder in Matlab

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Does there anyone know the difference between these two RS code function?

After i call the two function, rsdec can correct errors but other one can't.

If I want to encode [2 1 4 2] by RS,rsdec can correct errors but comm.RSDecoder still not to do that.

Thank you everyone.

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rsdec works only for 'n symbols' Rs(7,3) n=7 but comm.rsdec can be able to solve 10^i bits. a*n symbol values.