Description Usage Arguments Details Value Author(s) See Also Examples

Returns the index locations that match vector fid within data vector.

1 | ```
locate.fid(fid, vect, long = TRUE)
``` |

`fid` |
A lookup vector, typically numeric, which can be 1 element long or greater. Typical use is 2 elements long. fid<-c(1,2). This sequence of values will be searched within the data vector, vect. |

`vect` |
Data vector of interest, within which fid will be searched. |

`long` |
Default is TRUE, will use a slower algorithm. When long=true, any length of fid can be used to search in vector. Computing time also depends on the length of fid. Caution advised when setting long = FALSE. Null values maye be returned. |

Returns the positions within the data vector where fid is found. Do not use this function if fid is length = 1. Use which(). If length(fid)>1, the elements of fid must be adjacent and in that specific order.

An object of type integer, to be used as an index subset.

Glenn J. Tattersall

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | ```
# Similar to the which or match functions in package::base, except that this returns the
# index placement where variable fid occurs in data
## Define a vector
s<-c(2,3,42,38,88,33,55,99,32,56,22,48,1,2,3,5,6,7,8,9,10,12,20)
## Define what fid sequence to look for: i.e. what adjacent elements to look for in
## this order
fid<-c(22,48)
## look for all instances where 22 and 48 occur together, using locate.fid
system.time(where.locate<-locate.fid(fid,s,long=FALSE))
where.locate
## verify that locate.fid worked by subsetting s, using where.locate as index
s[where.locate]
system.time(where.locate<-locate.fid(fid,s,long=TRUE))
s[where.locate]
## longer algorithm check
### Define a vector of 100000 random numbers from 1 to 100
s<-ceiling(runif(100000, 0, 100))
## Define what fid sequence to look for: i.e. what adjacent elements to look for in
## this order
fid<-c(22,48)
system.time(where.locate<-locate.fid(fid,s,long=TRUE))
where.locate
## verify that locate.fid worked by subsetting s, using where.locate as index
s[where.locate]
``` |

Thermimage documentation built on Nov. 30, 2017, 9:01 a.m.

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