Why is one ans removed when assigning simulink/matlab?

问题

Why is one ans removed when I assign y? I want to return the two descriptions.

x = rmi('get',gcs)

x = 

2x1 struct array with fields:

    doc
    id
    linked
    description
    keywords
    reqsys

>> x.description

ans =

FirstReq


ans =

SecondRec

>> y = x.description

y =

FirstReq

>> y

y =

FirstReq

回答1:

You probably need to use the {}:

>> x.description

ans = FirstReq

ans = SecondRec

>> y = {x.description}

y =
{
  [1,1] = FirstReq
  [1,2] = SecondRec
}

You can then index into y using either () (output will be a cell array) or {} (output will be whatever the data type of the description field is):

>> y(1)

ans =
{
  [1,1] = FirstReq
}

>> y{1}
ans = FirstReq

Note: I am using Octave, not MATLAB, but it should still apply.

来源：https://stackoverflow.com/questions/17811746/why-is-one-ans-removed-when-assigning-simulink-matlab