# args3d: Process 3D arguments In p3d: Plot 3d data and fitted surfaces

## Description

Process 3D arguments, also allowing `xy`, `xz`, `yz` to indicate planes in 3D space, and allowing, e.g., `x='min'`, `x='max'`, `x='mid'` to specify the minimum, maximum, or middle value for a given coordinate axis.

## Usage

 `1` ```args3d(...) ```

## Arguments

 `...` A collection of arguments for 3D graphics functions including `x`, `y`, `z`

## Details

For any coordinate axis or plane you can specify 'min', 'max', 'mid' as values

## Value

Returns a list with a matrix, x with xyz values and with other arguments specified in the call.

## Note

If the first argument is positional then variables must be in order x,y,z

## Author(s)

Georges Monette

`Plot3d`, `Lines3d`,
 ``` 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 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59``` ```##---- Should be DIRECTLY executable !! ---- ##-- ==> Define data, use random, ##-- or do help(data=index) for the standard data sets. ## The function is currently defined as function(...) { help <- " - returns a list with a matrix, x with xyz values and with other args - can specify 'min', 'max', 'mid' as values not mixed with numerical values CAUTION: If first argument is positional then variables must be in order x,y,z " na2f <- function( x ) { x[is.na(x)] <- FALSE x } args <- list(...) getdim <- function(nam, args){ pos <- regexpr(nam, names(args)) arg.ind <- pos > 0 if( length(pos <- pos [ pos > 0 ])==0) return(0) cbind( args[arg.ind][[1]])[,pos] } if( is.null(names(args))) names(args) <- rep("",length(args) ) nn <- names(args) #disp(nn) if ( (length(nn) >2) && all( nn[1:3] =="")) names(args) [1:3] <- c('x','y','z') nn <- names(args) if ( (length(nn) > 0) && (nn[1] == "") ){ names(args)[1] <- 'xyz' args[[1]] = rbind( args[[1]]) } nn <- names(args) #disp(nn) nxyz <- sapply( nn, regexpr, "xyzyxzxzyyzxzxyzyz") #disp(nxyz) xyzs <- args[nxyz > 0] #disp(xyzs) oargs <- args[nxyz < 0] #disp(oargs) xyz <- cbind( x=getdim('x', xyzs), y=getdim('y',xyzs), z=getdim('z',xyzs)) if ( is.character(xyz) ) { bbox <- par3d('bbox') mins <- matrix(bbox[c(1,3,5)], nrow = nrow(xyz), ncol=3, byrow = T) maxs <- matrix(bbox[1+c(1,3,5)], nrow = nrow(xyz), ncol=3, byrow = T) mids <- (mins + maxs)/2 xyz[na2f(xyz=='min')] <- mins[na2f(xyz=='min')] xyz[na2f(xyz=='max')] <- maxs[na2f(xyz=='max')] xyz[na2f(xyz=='mid')] <- mids[na2f(xyz=='mid')] mode(xyz) <- "numeric" } a <- list(x = xyz) c(a,oargs) } ```