[R] if() for() { }

[Nicolas Degallier]

Dear R'helpers,

I guess the solution is trivial but despite some hours of testing and  
looking at the doc, I was unable to fix the following problem.

I want to do either:

for (i in 1:lat) a[i,which(a[i,]==0] <- NA

or:
for (i in 1:lat) a[i,which(a[i,]==-9999|a[i,]==9999|a[i,]==9998|a[i,] 
==-9998)] <- NA

if the word "Time" is or is not present in variable "nomfichier":
test<-grep("Time",nomfichier)

the controlling test would be:

if (test==1)

But in either cases I obtain:

if (grep("Time",nomfichier)>0) for (i in 1:lat) a[i,which(a[i,]==0]  
<- NA
Erreur : syntax error

 > if (grep("Time",nomfichier)<>0) {for (i in 1:lat) a[i,which(a[i,] 
==-9999|a[i,]==9999|a[i,]==9998|a[i,]==-9998)] <- NA}
Erreur : syntax error
 >

I would appreciate if someone can show me the right way to do this.

Sincerely
Nicolas

Nicolas Degallier

UMR 7159 / IRD UR182
Laboratoire d'Océanographie et du Climat, Expérimentation et  
Approches Numériques (LOCEAN)
Tour 45-55, 4e ét., case 100, 4 place Jussieu
75252  Paris Cedex 5  France
tél: (33) 01 44 27 51 57
fax: (33) 01 44 27 38 05

E-mail: <Nicolas.Degallier at ird.fr>
pdf reprints (login="anonymous"; password="your at email.address"):  
ftp://ftp.locean-ipsl.upmc.fr/LOCEAN/ndelod