First of all: Happy new year to the members of the gretl community!

Some years ago the possibility of testing non-linear restrictions within
the single-equation framework (based on the Delta method) was added. The
help file provides a simple example on this:

<hansl>
function matrix restr (const matrix b)
   matrix v = -b[3]/b[2]
   return v
end function

open denmark --quiet
ols diff(LRM) 0 LRM(-1) LRY(-1) IBO(-1)

restrict
   rfunc = restr
end restrict
</hansl>

The issue I face is given by the fact that I would like to test not only
the restriction -b[3]/b[2] = 0 but also e.g. -b[4]/b[2] = 0 separately.
Atm I have to write down another function

function matrix restr2 (const matrix b)
   matrix v = -b[4]/b[2]
   return v
end function

if I want to test -b[4]/b[2] = 0.

Is this right or is there an alternative way to obtain a vector of test
results? It would be helpful if one could extend the function by
something like this:

function matrix restr (const matrix b, int pos1, int pos2)
   matrix v = -b[pos2]/b[pos1]
   return v
end function


Best,
Artur
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