Apply function to elements of a matrix column

[leprechaun]

Sorry to annoy you again. I try really hard to get used to my calculator. It is only there are weeks or mounths when I don't have time because of work and family.

I asked about cas in home in an other thread. To be honest I am not fully satified with the answer or to say the facts, but that is not the point here.

But what is going on here, again? I learned that home is for numerial stuff and cas for anything with undefined vars involved. That is in a way annoying when you find out you have to switch, but why would the abs command behave totally different in cas and in home??? Is it that I should use cas for numerical marix (manipulation)? I'm anxious about further posts!