I think the reason this fails is that the condition should result in a boolean scalar, whereas here it is a series of booleans.

In this case you can use the ternary operator to set up a conditional assignment (see User Guide p. 140):

<hansl>

open australia.gdt

series E_hp = E - hpfilt(E, 1600)

series E_reg1= (E > E_hp) ? E : NA

series PAUreg1 = (E > E_hp) ? PAU : NA

series PUSreg1 = (E > E_hp) ? PUS : NA

<hansl>

HTH,

Jan Annaert

From: Henrique Andrade <henrique.coelho@gmail.com>
Reply-To: "gretl-users@lists.wfu.edu" <gretl-users@lists.wfu.edu>
Date: woensdag 25 maart 2015 17:15
To: "gretl-users@lists.wfu.edu" <gretl-users@lists.wfu.edu>
Subject: [Gretl-users] "If-Else" syntax help

Dear Gretl community,

I'm not a good "if-else" user so I need a little help. What's wrong with the following code?

<hansl>

open australia.gdt

series E_hp = E - hpfilt(E, 1600)

if E > E_hp

series E_reg1 = E

series PAUreg1 = PAU

series PUSreg1 = PUS

else

series E_reg1 = NA

series PAUreg1 = NA

series PUSreg1 = NA

endif

<hansl>

When I execute it I get the messages: "error evaluating 'if'" "Error executing script: halting".

Best regards,

Henrique Andrade