Addition of derivative goes wrong

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MINATI PATRA
MINATI PATRA on 27 May 2021
Commented: MINATI PATRA on 27 May 2021
syms M k Ec Pr y
T(M, k, Ec, Pr, y) = (A*Ec*Pr/(Ec*Pr-4*A))*( exp(-2*y*sqrt(A)) - exp(-y*sqrt(Ec*Pr)) ) + (y*sqrt(Ec*Pr)/2 + 1)*exp(-y*sqrt(Ec*Pr));
DT = gradient(T(M, k, Ec, Pr, y),Vp); Vp = [M k Ec Pr y]; Vs = [5 1 0.1 5 0.1];
DTV = subs(DT,Vp,Vs);
% ANSWER is coming as this for the above approach: 0.14785682021063908572684904500442
% But when I ran the derivative separately and adding them answer is coming as : 0.2014966764864323281894134426085 ( correct ANSWER according to my work as % I have drawn fig which is matching with previous work)
% How to modify or ...
  2 Comments
Torsten
Torsten on 27 May 2021
I don't see where you add the derivatives.
Further, Vp must be defined before you compute the gradient.
MINATI PATRA
MINATI PATRA on 27 May 2021
It is ok now,
Thank you
Dear Torsten

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