get only addends of subexpression

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David Armendáriz
David Armendáriz 2018-3-15
评论： Walter Roberson 2018-3-15
Suppose I have a symbolic expression like this
syms x x0
f=(x-x0)^3
children(f)
[(x-x0),3]
I would like to get instead
[(x-x0)^3]
How can this be done?
  1 个评论
Steven Lord
Steven Lord 2018-3-15
Can you say a little more about your ultimate goal? Perhaps there's a way to do what you want without running a MuPAD expression via feval(symengine, ...).

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Walter Roberson
Walter Roberson 2018-3-15
You cannot do that with children().
You need to do something like,
feval(symengine, '(V) -> if testtype(V,"_plus") then [op(V)] else [V] end_if;', f)
  2 个评论
David Armendáriz
David Armendáriz 2018-3-15
Thanks, and is there any way to do the same but with multiplication? I mean, if I have
f=a*b*c*d
I would like to get
[a,b,c,d]
And when
f=a
then the output is
[a]
Walter Roberson
Walter Roberson 2018-3-15
Use _mult instead of _plus for that purpose.

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