Dear Edsoncv:

I have the same problem as Rugiada. This error comes from my production functions, for example like this:

QINT_G2(I)… QINT(I,‘G2’) =L= (QQINT(I,‘G1’,‘G2’)**DELTA_INT(I,‘G1’,‘G2’))*(QQINT(I,‘G2’,‘G2’)**DELTA_INT(I,‘G2’,‘G2’))

*(QQINT(I,‘G3’,‘G2’)**DELTA_INT(I,‘G3’,‘G2’))*(QQINT(I,‘G4’,‘G2’)**DELTA_INT(I,‘G4’,‘G2’))

*(QQINT(I,‘G6’,‘G2’)**DELTA_INT(I,‘G6’,‘G2’))*(QQINT(I,‘G7’,‘G2’)**DELTA_INT(I,‘G7’,‘G2’));

I already tried your suggestion; however, the error has not been corrected.

Could you please advise me any other suggestion to correct this error.

Thank you so much for your help

Loan

**** ERRORS/WARNINGS IN EQUATION QP_BIO

10 warning(s): vcPower: GRAD SINGULAR: x**c, x=0, 0 hi,

i am a beginner user of GAMS, i am running a nonlinear programming

model minimizing a squared deviation between two variables d and x.

and i get errors in the solution

Error: vcPower: GRAD SINGULAR: x**c, x=0, 0

the model is as follows:

min s =e= sum((j,k)$(ord(k) lt ord(j)), e(j,k)**2);

subject to

eq_1(j,k)$(ord(k) lt ord(j))…d(j,k)- (sum(r, (x(j,r)-

x(k,r))**2))**0.5- e(j,k)=e=0;

eq_3(r)… sum(j, x(j,r))=e=0;

eq_4… sum((j,k,r)$(ord(k) lt ord(j)), (x(j,r)-x(k,r))**2)=e=1;

i don’t know how to solve this problem and get rid of this error, and

what does this error mean

can anyone help me?

thanks in advance

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