Can one use fsolve with symbolic value equations?
7 views (last 30 days)
Show older comments
Hello everyone. I am wondering if in Matlab, one can use symbolic variables together with fsolve. I have to equate a gradient (calculated from substituted variables) to zero. Here is what I tried. Could anyone tell me what is wrong with this? If I can't use fsolve with symbolic value equations, how could I solve for 2 nonlinear symbolic valued equations with two unknowns? Tks:
function gradB = myfun(X)
syms X(1) X(2) n m
B = subs(X(1)+ X(2), [X(1), X(2)], [n+m, n-m]);
gradB = gradient(B, [n, m])
Script
X0 = [...];
fhandle = @myfun;
X = fsolve(fhandle, X0)
0 Comments
Accepted Answer
Star Strider
on 25 Jul 2015
Edited: Star Strider
on 25 Jul 2015
It’s a bit difficult to follow what you’re doing, but if you want to use symbolic expressions and you don’t mind slow code, use the solve function.
the fsolve function will find the values where the argument function equates to zero, so if you want to do the same with your symbolic gradient, my answer to Finding the null gradient directly applies to your problem.
6 Comments
More Answers (0)
See Also
Categories
Find more on Assumptions in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!