`sDmatMinima`

is supposed to identify local minima of distance
matrix (resulting from `sDmat`

). The criterion of being
local minima is that the distance associated with a hexagon/rectangle
is always smaller than its direct neighbors (i.e., 1-neighborhood)

sDmatMinima(sMap, which_neigh = 1, distMeasure = c("median", "mean", "min", "max"))

- sMap
- an object of class "sMap"
- which_neigh
- which neighbors in 2D output space are used for the calculation. By default, it sets to "1" for direct neighbors, and "2" for neighbors within neighbors no more than 2, and so on
- distMeasure
- distance measure used to calculate distances in high-dimensional input space. It can be one of "median", "mean", "min" and "max" measures

`minima`

: a vector to store a list of local minima (represented by the indexes of hexogans/rectangles

Do not get confused by "which_neigh" and the criteria of being local minima. Both of them deal with 2D output space. However, "which_neigh" is used to assist in the calculation of distance matrix (so can be 1-neighborhood or more); instead, the criterion of being local minima is only 1-neighborhood in the strictest sense

# 1) generate an iid normal random matrix of 100x10 data <- matrix( rnorm(100*10,mean=0,sd=1), nrow=100, ncol=10) # 2) get trained using by default setup sMap <- sPipeline(data=data)Start at 2018-01-18 16:56:05First, define topology of a map grid (2018-01-18 16:56:05)...Second, initialise the codebook matrix (61 X 10) using 'linear' initialisation, given a topology and input data (2018-01-18 16:56:05)...Third, get training at the rough stage (2018-01-18 16:56:05)...1 out of 7 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)2 out of 7 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)3 out of 7 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)4 out of 7 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)5 out of 7 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)6 out of 7 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)7 out of 7 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)Fourth, get training at the finetune stage (2018-01-18 16:56:05)...1 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)2 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)3 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)4 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)5 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)6 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)7 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)8 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)9 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)10 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)11 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)12 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)13 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)14 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)15 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)16 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)17 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)18 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)19 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)20 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)21 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)22 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)23 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)24 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)25 out of 25 (2018-01-18 16:56:05)updated (2018-01-18 16:56:05)Next, identify the best-matching hexagon/rectangle for the input data (2018-01-18 16:56:05)...Finally, append the response data (hits and mqe) into the sMap object (2018-01-18 16:56:05)...Below are the summaries of the training results:dimension of input data: 100x10 xy-dimension of map grid: xdim=9, ydim=9, r=5 grid lattice: hexa grid shape: suprahex dimension of grid coord: 61x2 initialisation method: linear dimension of codebook matrix: 61x10 mean quantization error: 4.9630432442287Below are the details of trainology:training algorithm: batch alpha type: invert training neighborhood kernel: gaussian trainlength (x input data length): 7 at rough stage; 25 at finetune stage radius (at rough stage): from 3 to 1 radius (at finetune stage): from 1 to 1End at 2018-01-18 16:56:05Runtime in total is: 0 secs# 3) identify local minima of distance matrix based on "median" distances and direct neighbors minima <- sDmatMinima(sMap=sMap, which_neigh=1, distMeasure="median")