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how to count the number of terms in syms

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EllaD
EllaD 2020-10-20
编辑： EllaD 2020-10-20
Hello!
I have a syms variable let's say A which is an addition of many terms say: A=a+b-c*a+a*b-d+... I want to count the number of added terms in A, how can I do that? my matlab version is 2012 by the way.
Thank you!

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回答（3 个）

Ameer Hamza
Ameer Hamza 2020-10-20
Try this
syms a b c d
A=a+b-c*a+a*b-d+a*c;
num_terms = numel(regexp(char(A), '[+-]?'))+1;
Walter Roberson
Walter Roberson 2020-10-20
feval(symengine, 'nops', A)
In newer releases you can numel(children(A)) but that is several years after your version
  1 个评论
EllaD
EllaD 2020-10-20
编辑：EllaD 2020-10-20
Thanks but it seems that this doesnt work, I have 87 terms but this outputs 3.
EDIT: It is strange though, I checked this code for 5 terms and it does work.

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KSSV
KSSV 2020-10-20
You can get the number of sym variables present in the work spce using:
s = whos ;
iwant = nnz(strcmp({s(:).class},'sym'))

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