Selecting non-zero elements from a symbolic vector
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Given a symbolic vector, say [a*b, 0 , a^2*b*c, 1, 0]. How could I obtain a vector from the non-zero entries, I would like for the given example to have [a*b, a^2*b*c, 1] as a result. I tried nonzeros but this does not work for type sym.
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Walter Roberson
2015년 6월 23일
Do you want to remove the entries that are identical to 0, or the entries that can be proven to be 0? For example if one of the entries was 1 - cos(theta)^2 - sin(theta)^2 then we could show that this must be 0 (at least for finite non-nan values), so should it be removed?
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Star Strider
2015년 6월 23일
This works for me (in R2015a):
syms a b c
V = [a*b, 0 , a^2*b*c, 1, 0];
Vnz = V(V~=0)
Vnz =
[ a*b, a^2*b*c, 1]
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Mischa Kim
2015년 6월 23일
Farid, you could use
syms a b c d = [a*b, 0 , a^2*b*c, 1, 0]; d(d==0) = [] d = [ a*b, a^2*b*c, 1]
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Azzi Abdelmalek
2015년 6월 23일
편집: Azzi Abdelmalek
2015년 6월 23일
syms a b c
d = [a*b, 0 , a^2*b*c, 1, 0]
c=nonzeros(d).'
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