Alternative to EVAL string expressions in optimization

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Kylekk
Kylekk 2022-5-30
评论： Kylekk 2022-5-31
Hi,
I have a huge matrix, each element is a string like "16*q^2+4*q", i call it new_sol_array, now i want to define multiple optimconstr object with each row one set of constraints. This is what i did:
constr= optimconstr(M,N);
for i=1:rows
for j =1:column
constr(i,j)=eval(new_sol_array(i,j)+'==0');
end
end
As you would see, this is extremely slow. Is there a better alternative to do the same thing? i have read some of the answers about eval on this website yet did not find anything relevant enough to my problem.
Thank you so much!!!

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Walter Roberson
Walter Roberson 2022-5-31
Instead of eval() everything, use file operations to emit a file along the lines of
constr = [
EQN, EQN,... EQN
EQN, EQN,... EQN
]
along with a function header. Then "clear" the name of the file. Then invoke the file as a function passing in q and whatever else is required
This reduces the burden by not needing to eval() each one individually.
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Stephen23
Stephen23 2022-5-31
编辑：Stephen23 2022-5-31
  1. yes
  2. no
  3. no
Did you try writing a function file and calling it, as Walter Roberson described?
Kylekk
Kylekk 2022-5-31
Thank you Stephen, I did not do that simply because I don't get the idea. What kind of function file are you talking about? I have only a string array, why would a function takes variable names as input help?

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