math functions for coef

[maxchen]

It seems that math functions do NOT support coefficient vector. For example

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wfcreate u 4 coef(3) c1 = 1 coef(3) c2 = 2 c2 = exp(c1) 'error

[EViews Gareth]

coefficient vectors aren't really intended to be used for calculations etc..., so yes, math functions will not work upon them.

[EViews Glenn]

But it's easy enough to get your coef into a vector object with which you can use functions:

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coef(2) c1 c1.fill 1, 2 vector c2 = c1 vector c3 = exp(c2)

[maxchen]

thanks
yeah, by coef -> vector ->coef, for I use coef in LogL. Once the estimation of Logl is succeeded, I use another Logl where the parameter transformation inside Logl is remove, and I transform the result as the starting value to estimate the new Logl.