Choose 1 real solution between 4 solutions
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hello, i have a probleme of making Ma choose the right answer, the right solution is the 2nd one of x, y and z, is there any command to do that??
采纳的回答
You're using a syntax that is no longer valid in Matlab. Since you didn't specify your Matlab release (and posted your code as picture) I can't confirm the code below will work for you. It is also unclear to me why the first solution of you picture isn't a valid solution.
syms x
x=solve(x^3==1)
result=double(x);
L=abs(imag(result))<=eps;
correct_result=result(L);
correct_result
2 个评论
maze djenn
2021-5-17
Rik
2021-5-17
Then the code I showed you should solve your question.
Just a slight edit to L (and to the syntax for solve to account for your release):
syms x
x=solve('x^3=1');
result=double(x);
L= ... list all conditions here
abs(imag(result))<=eps & ...
real(result)>0;
correct_result=result(L);
correct_result
You should really mention it if you're using something older than a few years. R2010a and R2010b are not trivial to get to run on a modern operating system.
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