Daniel,

There are actually 2 problems here:

1) You have an extra comma after p – change (scalar p,) to (scalar p). The comma makes Gretl think there are more input arguments coming, hence the ‘missing type identifier.’

2) Re Logan’s suggestion, you need to assign a value to q before the return command.

The following works on my (Win 7) machine:

function scalar model(scalar p)

    q = 3*p

    return q

end function

HTH,

PS

From: gretl-users-bounces@lists.wfu.edu [mailto:gretl-users-bounces@lists.wfu.edu] On Behalf Of Daniel Sirim
Sent: Friday, August 17, 2012 8:20 AM
To: gretl-users@lists.wfu.edu
Subject: [Gretl-users] function Command

Hello ,

i have got a new question refering to  the “function” command.

First of all I want to understand the Syntax of this command. I read the Guide and check the syntax but why is it not working?

 genr p = 3

function scalar Model( scalar p,)

    q= 3*p

end function

just a small example but to get to understand it. It says : expected a type identifier…. But why ?  there is the name of the Function called Model and also the type … scalar…. What is wrong with that?

If I got this, it is my aim to built an Modular System, which means, First on the upper side of the script I want to have the basic formulas, like

1. function  series AB (series a, scalar b, scalar c, scalar d)   

            a*(1-exp(-b*(c-c0)))

end function

2. Function …..

3. Function …..

And so on …

After declaring and defining the parameters und the function body of the basic formulas, I want to stick them together, I need it like this because it depends on the case which basic function I need and also the sequence could be different  ( for example: case 1: 2. Formula + 3. Formula + 2. Formula…. Case 2: 3.Formula + 1.Formula …)

My Other Question is is it possible to make this "combinedfunction" easier to write ?

What I mean is let the commands like series oder scalar away, cause its also declared.

Hopefully somebody can help me I thing there will be some other question but I think for the first round it more then enough.

Thank you, and I hope for some answers =)

Daniel.