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Re: [ferret_users] averaging wind vectors



Hi,
Ferret syntax always treats vector components as individual variables.  So to subtract one vector field from another one, you subtract the components.

let a=u[d=1,k=2,l=1:30@ave]
let b=v[d=1,k=2,l=1:30@ave]

let c=u[d=1,k=2,l=1:60@ave]
let d=v[d=1,k=2,l=1:60@ave]

vector/length=5 a-c, b-d



On 10/11/2012 3:30 AM, nitin patil wrote:
Dear Sir

let a=u[d=1,k=2,l=1:30@ave]
let b=
v[d=1,k=2,l=1:30@ave]

let c=u[d=1,k=2,l=1:60@ave]
let d=
v[d=1,k=2,l=1:60@ave]


how to subtract this above to get anomaly

say vec/length=5  a,b - c,d

shows error


On Thu, Oct 11, 2012 at 3:37 PM, Nagarjuna Rao <dnrao.au@xxxxxxxxx> wrote:
Hi
you just try this code.

let a=u[d=1,k=2,l=1:30@ave]
let b=
v[d=1,k=2,l=1:30@ave]
vector a,b

It shold work.
all the best.


On Thu, Oct 11, 2012 at 2:43 PM, nitin patil <nitinpatil85@xxxxxxxxx> wrote:
Dear Ferret users,

I am trying to average one month wind u,v and to keep it in a variable 'all' so that I can subtract it from long term average to see the anomaly

but it is showing error to keep the variable 'all'

let all=u[d=1,k=2,l=1:30@ave],v[d=1,k=2,l=1:30@ave]

**ERROR: command syntax: u[d=1,k=2,l=1:30@ave],v[d=1,k=2,l=1:30@ave]
          Definition contains multiple expressions



--
Regards,
Nitin



--
D.Nagarjuna Rao
CSIR Research Fellow,
Climate and Global modeling division,
IITM,Pune-411008.
Phone no: 8087706223(old)
                 8055912879(new)
                 9689410009(new idea)




--
Regards,
Mr. Nitin Patil
PhD Research Scholar,
Centre of Excellence in Climate Studies,
Indian Institute of Technology (IIT) Bombay,
Powai, Mumbai - 400076, INDIA.
e-mail: nupatil@xxxxxxxxxx



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