Addition of derivative goes wrong

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MINATI PATRA
MINATI PATRA 2021-5-27
评论： MINATI PATRA 2021-5-27
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 个评论
Torsten
Torsten 2021-5-27
I don't see where you add the derivatives.
Further, Vp must be defined before you compute the gradient.
MINATI PATRA
MINATI PATRA 2021-5-27
It is ok now,
Thank you
Dear Torsten

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