grads, vector definition

[Eric Altshuler]

Hello Cristian,

You can't use this script to accomplish your task. All your script does is redefine 'var2' every time through the loop. You need to do the following (assuming 'time' is the last value of t you want to consider):

'set t 2 'time
'define var2=var1-var1(t-1)'

The new variable var2 will, at time t, contain the value of var1(t)-var1(t-1). Note that var2 is undefined for t=1.

Best regards,

Eric L. Altshuler
Assistant Research Scientist
Center for Ocean-Land-Atmosphere Studies
4041 Powder Mill Road, Suite 302
Calverton, MD 20705-3106
USA

E-mail: ela at cola.iges.org
Phone: (301) 902-1257
Fax: (301) 595-9793

----- Original Message -----
From: "Cristian Gonzal Muñoz Castillo" <cmunozc at UDEC.CL>
To: GRADSUSR at LIST.CINECA.IT
Sent: Monday, July 6, 2009 4:55:21 PM GMT -05:00 US/Canada Eastern
Subject: grads, vector definition

Hi,

I'm trying to define a vector in grads. Can you help me with that?. My
script is as follows

'set t 1'
'define var2 = var1'
i=2
while(i<=time)
'set t ' i
'define var2 = var1 - var1(t=' i-1 ')'
i = i+1
endwhile

Bottom line, i want to make A(I) = B; as in any other scripting language...

Thanks for your attention, Sincerely

--
Cristian G. Muñoz Castillo
Licenciado en Ciencias Físicas
Candidato a Geofísico
Of. 442
Tel. (41) 2203155
Depto. Geofísica
Facultad Ciencias Físicas y Matemáticas
Universidad de Concepción
Concepción
Chile
^^^^^^^^^^^^^^^^^^^HATUSIME^^^^^^^^^^^^^^^^^^^^^