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How to create a vector of symbolic variables with specific labeling

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KostasK
KostasK 2021년 9월 12일
답변: John D'Errico 2021년 9월 12일
I currently have a vector of unevenly spaced increasing values similar to this one:
v = [1 2 3 5 7 9 10 12 18 29]
What I would like to do is create a vector of symbolic variables such that
vsym = [x1 x2 x3 x5 x7 x9 x10 x12 x18 x29]
I know that I can create a function to produce symbolic variables with increasing indices from 1 to 10 lets say by using sym('x', [1 10]), however I am not able to find a way to quickly assign them different indices as I would desire, such as sym('x', v), whee v would be my vector.
Any help would be appreciated

채택된 답변

Paul
Paul 2021년 9월 12일
v = [1 2 3 5 7 9 10 12 18 29];
vsym = sym('x',[v(1) v(end)]);
vsym=vsym(v)
vsym = 
  댓글 수: 2
Paul
Paul 2021년 9월 12일
v = [2 3 5 7 9 10 12 18 29];
vsym = sym('x',[1 v(end)]);
vsym = vsym(v)
vsym = 

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추가 답변(2개)

Awais Saeed
Awais Saeed 2021년 9월 12일
Not the best way but will work good enough for small vectors
vsym = sym('x',size(v));
for col = 1:1:size(v,2)
char_str = ['x' num2str(v(col))];
vsym(col) = sym(char_str);
end
disp(vsym)
I do not know if this could be done more faster.

John D'Errico
John D'Errico 2021년 9월 12일
The simple direct way seems easiest.
v = sym('v',[1 29]);
v = v([1 2 3 5 7 9 10 12 18 29])
v = 

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