I don't untersantd the following error:

??? Input argument "a" is undefined.

Error in ==> primeira at 3
f =(-3-a-b)^2 + ( -1.89-a-b*exp(0.5*c) )^2 + (-1.03 - a- b*exp(c))^2 + (-0.36-a-b*exp(1.5*c))^2 + (0.16-a-b*exp(2*c))^2 + (0.57-a-b*exp(2.5*c))^2 +
(0.88-a-b*exp(3*c))^2 ;

My function is:

function [F ] =primeira (a,b,c)

f =(-3-a-b)^2 + ( -1.89-a-b*exp(0.5*c) )^2 + (-1.03 - a- b*exp(c))^2 + (-0.36-a-b*exp(1.5*c))^2 + (0.16-a-b*exp(2*c))^2 + (0.57-a-b*exp(2.5*c))^2 + (0.88-a-b*exp(3*c))^2 ;

F= [diff(f,a) ; diff(f,b) ; diff(f,c) ];

end

[Star Strider]

What code did you use to call your function?

Answer 1

[Andrei Bobrov]

syms a b c
f =(-3-a-b)^2 + ( -1.89-a-b*exp(0.5*c) )^2 + (-1.03 - a- b*exp(c))^2 ...
 + (-0.36-a-b*exp(1.5*c))^2 + (0.16-a-b*exp(2*c))^2 + (0.57-a-b*exp(2.5*c))^2 + (0.88-a-b*exp(3*c))^2 ;
df = jacobian(f,[a,b,c])
dfun = matlabFunction(df)