variance equation in GARCH

[jeffrey802]

hi
i am very confued by the variance equation edit box in eviews. whenever i try to add a lag term of GARCH into the variance equation, eviews reminds me the GRACH is undefined? does the eview can only recognise the series in the workfile?Is it possible to include a Garch(-1) term into the variance equation in eviews? thank you in advance

[EViews Gareth]

It only recognizes series in the workfile.

[jeffrey802]

i see, so the only way to include the GARCH(-1) into the variance equation is programming. can i get any guide for programming this problem?thank you for the reply

[jeffrey802]

i see, so the only way to include the grach(-1) is programming. where can i get the codes for grach in eviews 7? thank you