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starting_point argument in sample_points() not functional #367

@sumtxt

Description

@sumtxt

When setting starting_point, the random walk does not move and remains at the starting point.

> library(volesti)
Loading required package: Rcpp
> P = gen_cube(3, 'H')

# Generate 1 point
point = sample_points(P, n = 1, 
        random_walk = list("walk" = "BaW", "walk_length" = 5))

# Use generated point as starting_point
sample_points(P, n = 10, 
        random_walk = list("walk" = "BaW", "walk_length" = 5, starting_point=point))

sessionInfo()
           [,1]       [,2]       [,3]       [,4]       [,5]       [,6]
[1,] -0.1359049 -0.1359049 -0.1359049 -0.1359049 -0.1359049 -0.1359049
[2,] -0.9145357 -0.9145357 -0.9145357 -0.9145357 -0.9145357 -0.9145357
[3,]  0.5827428  0.5827428  0.5827428  0.5827428  0.5827428  0.5827428
           [,7]       [,8]       [,9]      [,10]
[1,] -0.1359049 -0.1359049 -0.1359049 -0.1359049
[2,] -0.9145357 -0.9145357 -0.9145357 -0.9145357
[3,]  0.5827428  0.5827428  0.5827428  0.5827428
R version 4.5.1 (2025-06-13)
Platform: aarch64-apple-darwin24.4.0
Running under: macOS Sequoia 15.5

Matrix products: default
BLAS:   /opt/homebrew/Cellar/openblas/0.3.30/lib/libopenblasp-r0.3.30.dylib 
LAPACK: /opt/homebrew/Cellar/r/4.5.1/lib/R/lib/libRlapack.dylib;  LAPACK version 3.12.1

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

time zone: GMT
tzcode source: internal

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] volesti_1.1.2-9 Rcpp_1.1.0     

loaded via a namespace (and not attached):
[1] compiler_4.5.1

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