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model writing in UDM

in the POM.pdf on chapter "Model Writing" Model Writing Notes part, it shows the following codes fragment:

" 200 IF (CON(J) .GT. 2.*DELT) GO TO 210 STATE(K)=ECOMP(I) STORE(K)=ECOMP(I) GO TO 210 DSTATE(K)=(ECOMP(I)-STATE(K))/CON(J) VERROR=VREF(I)+VOTHSG(I)-STATE(K)"

what is STORE , the manual only says it is a integrator memory, but does give an example. so here why use store can solve small time constant problem? what is the theory and formulas behind STORE variable?

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model writing in UDM

in the POM.pdf on chapter "Model Writing" Model Writing Notes part, it shows the following codes fragment:

"

200 IF (CON(J) .GT. 2.*DELT) (CON(J).GT.2.*DELT) GO TO 210
     STATE(K)=ECOMP(I)
    STORE(K)=ECOMP(I)
  STORE(K)=ECOMP(I)
GO TO 210
220
210 DSTATE(K)=(ECOMP(I)-STATE(K))/CON(J)
VERROR=VREF(I)+VOTHSG(I)-STATE(K)"

220 VERROR=VREF(I)+VOTHSG(I)-STATE(K)

what is STORE , the manual only says it is a integrator memory, but does give an example. so here why use store can solve small time constant problem? what is the theory and formulas behind STORE variable?