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symbolic array, zero-based elements into another array

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Artur M. G. Lourenço
if I have the following matrix:
syms x11 x21 x31 x41
a = [ 1*x11 2*x21 3*x31 3*x41]
b = [ 1*x11 2*x21 3*x41]
I want to generate a array which is c:
c = [1*x11 2*x21 0 3*x41]
is easy to do this however does not touch time with sym then forgot.
Thanks in advance.

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采纳的回答

Walter Roberson
Walter Roberson 2011-11-9
I do not understand your line about "does not touch time with sym then forgot".
c = a;
c(a == sum(a) - sum(b)) = 0;
You might perhaps want to describe the variable possibilities in more detail if the above is not the answer.

更多回答（2 个）

Andrei Bobrov
Andrei Bobrov 2011-11-9
syms x11 x21 x31 x41
a = [ 1*x11 2*x21 3*x31 3*x41]
b = [ 1*x11 2*x21 3*x41]
c = a.*ismember(a,b)
Artur M. G. Lourenço
Thank you for all

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