measuRing (version 0.5.1)

colNarrow: Narrow rings

Description

This function can detect narrow rings in a sequence of tree-ring widths in wood (TRWs). This and other in-package functions are recursively implemented by multiDetect.

Usage

colNarrow(rwidths, marker = 5)

Value

character vector with the columns in gray matrix corresponding to the narrow rings (see ringDetect, multiDetect, andplotSegments).

Arguments

rwidths

a dataframe with the ring widths such as that produced by ringWidths.

marker

a number from 1 to 10. Those rings with scaled averages greater than or equal to this argument will be identified as narrow rings.

Author

Wilson Lara <[e-mail]> [aut, cre] (<https://orcid.org/0000-0003-3527-1380>), Carlos Sierra [aut] (<https://orcid.org/0000-0003-0009-4169>), Felipe Bravo [aut] (<https://orcid.org/0000-0001-7348-6695>)

Details

Each ring is averaged with those rings on either side of it (t-1,t,t+1), and averages are divided by the highest computed average in the sample; such quotients are scaled from 10 (the narrowest possible ring) to one (the broadest ring).

Examples

## (not run) Read one image section in package measuRing:
image1 <- system.file("P105_a.png", package="measuRing")    
## (not run) compute a gray matrix from RGB in the image:
gray <- imageTogray(image = image1,ppi=1000)
## (not run) Columns in gray matrix to be included/excluded:
Toinc <- c(196,202,387,1564) 
Toexc <- c(21,130,197,207,1444,1484)
## (not run) tree-ring widths:
rwidths <- ringWidths(gray,inclu = Toinc,exclu = Toexc,last.yr=2012)
##(not run) narrow rings:
narrows <- colNarrow(rwidths,marker = 8)