Question

I’m planning to do the following in matlab:

• Create an empty set
• Insert an element which specifies a certain criterion in it

So, as a quick run on the matlab command line I did the following:

>> e=78

e =

    78

>> Ck=[]

Ck =

     []

>> Cn=Ck+e

Cn =

     []

But, I was expecting to get the following:

Cn = [78]

Why didn’t I get the expected result? And, how can I solve this out?

Thanks.

Answer 1

The @plus operator is defined as an arithmetic operation, but not as a set operation.

To add to an existing (1D) set at specified locations, you perform catenation and/or indexing. For example, to add at the end of a set, you can write

Cn = [Ck,e];

or

Cn = Ck;
Cn(end+1) = e;