CST_Analogs.R

    obs <- SelBox(obsVar, lon = lonVar, lat = latVar, region = region)$data
    exp <- SelBox(expVar, lon = lonVar, lat = latVar, region = region)$data
    metric3 <- Apply(list(obs), target_dims = list(c('lat', 'lon')), 
                     fun = .select, exp, metric = "cor")$output1
    metric3.original=metric3
    dim(metric3) <- c(dim(metric3), metric=1)
    margins <- c(1 : (length(dim(metric3))))[-dim_time_obs]
    pos3 <- apply(abs(metric3), margins, order, decreasing = TRUE)
    names(dim(pos3))[1] <- 'time'
    metricsort <- metric3[pos3]
    dim(metricsort)=dim(metric3)
    names(dim(metricsort))[1] <- 'time'
    metric <- abind(metric1, metric2, metricsort, 
                    along = length(dim(metric1)) + 1)
    metric.original <- abind(metric1.original, metric2.original, 
                             metric3.original, 
                             along = length(dim(metric1)) + 1)
    position <- abind(pos1, pos2, pos3, along = length(dim(pos1)) + 1)   
    names(dim(metric)) <- c(names(dim(metric1)), 'metric')
    names(dim(position)) <- c(names(dim(pos1)), 'pos')
    names(dim(metric.original)) = names(dim(metric)) 
    return(list(metric = metric, metric.original=metric.original,
                position = position))
  }
  else {
    stop("Parameter 'criteria' must to be one of the: 'Large_dist', ",
         "'Local_dist','Local_cor'.")
  }
}
.select <- function(exp, obs, metric = "dist") {
  if (metric == "dist") {
    result <- Apply(list(obs), target_dims = list(c('lat', 'lon')), 
                    fun = function(x) {sqrt(sum((x - exp) ^ 2, na.rm = TRUE))})$output1
  } else if (metric == "cor") {
    result <- Apply(list(obs), target_dims = list(c('lat', 'lon')), 
                    fun = function(x) {cor(as.vector(x), 
                                           as.vector(exp),
                                           method="spearman")})$output1
  } 
  result
}
.time_ref<- function(time_obsL,time_expL,excludeTime){
  sameTime=which(time_obsL %in% time_expL)
  result<- c(time_obsL[1:(sameTime-excludeTime-1)],
             time_obsL[(sameTime+excludeTime+1):length(time_obsL)])
  result
}

replace_repeat_dimnames <- function(names_exp, names_obs, lat_name = 'lat', 
                                    lon_name = 'lon') {
  if (!is.character(names_exp)) {
    stop("Parameter 'names_exp' must be a vector of characters.")
  }
  if (!is.character(names_obs)) {
    stop("Parameter 'names_obs' must be a vector of characters.")
  }
  latlon_dim_exp <- which(names_exp == lat_name | names_exp == lon_name)
  latlon_dim_obs <- which(names_obs == lat_name | names_obs == lon_name)
  if (any(unlist(lapply(names_exp[-latlon_dim_exp],
                        function(x){x == names_obs[-latlon_dim_obs]})))) {
    original_pos <- lapply(names_exp, 
                           function(x) which(x == names_obs[-latlon_dim_obs]))
    original_pos <- lapply(original_pos, length) > 0
    names_exp[original_pos] <- paste0(names_exp[original_pos], "_exp")
  }
  return(names_exp)
}

replace_time_dimnames <- function(dataL, time_name = 'time', 
                                  stdate_name='stdate', ftime_name='ftime') {
  names_obs=names(dim(dataL))
  if (!is.character(names_obs)) {
    stop("Parameter 'names_obs' must be a vector of characters.")
  }
  time_dim_obs <- which(names_obs == time_name | 
                          names_obs == stdate_name | names_obs == ftime_name)
  if(length(time_dim_obs) >1){
    stop ("more than 1 time dimension, please give just 1")
  }
  if(length(time_dim_obs) == 0){
    warning ("name of time dimension is not 'ftime' or 'time' or 'stdate' 
             or time dimension is null")
  }
  if(length(time_dim_obs)!=0){ names_obs[time_dim_obs]= time_name}
  names(dim(dataL))=names_obs
  return(dataL)
}