Sandy Herho

optionmc. OptionMC is a Python package for pricing European options using Monte Carlo simulation, featuring variance reduction techniques and educational visualizations. Designed for both quantitative finance practitioners and students learning derivatives pricing.

kelvin-helmholtz-2d-solver. High-performance 2D solver for Kelvin-Helmholtz instability in incompressible flows, featuring Numba JIT compilation for 10-50x speedup and multi-core parallelization. Includes predefined scenarios, NetCDF output, automated visualization, and both CLI and Python API for the geophysical fluid dynamics studies.

kaliKupangDisch. This repository contains code, data, output, and figures associated with the A univariate extreme value analysis and change point detection of monthly discharge in Kali Kupang, Central Java, Indonesia manuscript

dla-ideal-solver. A high-performance Python library for simulating Diffusion-Limited Aggregation (DLA) with Numba JIT acceleration, parallel rendering, and automated fractal dimension analysis of dendritic growth patterns.

amocITFAghulasTimeSeries. This repository presents a comprehensive statistical framework for analyzing multi-decadal trends and causal relationships in global ocean circulation systems, examining time series observations of the Indonesian Throughflow, Agulhas Current, and Atlantic Meridional Overturning Circulation.

tutorEksploR. Materi pelatihan eksplorasi data menggunakan R

buku_seaborn. Repositori ini memuat kode - kode yang saya gunakan dalam menyusun buku Tutorial Visualisasi Data Menggunakan Seaborn

simple_idealized_1d_nlse. Fast and accurate 1D NLSE solver using pseudo-spectral methods. Simulates solitons, breathers, and nonlinear wave phenomena with adaptive time-stepping and conservation law monitoring.

buku_metnum_Python. Repositori ini memuat kode dan gambar yang digunakan pada buku "Pengantar Metode Numerik Terapan Menggunakan Python".

kupang_rai. Code and dataset for rainfall time-series analysis and statistical forecasting over Kupang, East Nusa Tenggara, Indonesia

matlab-things. MATLAB

imc-precip-iso. imc-precip-iso is a stable isotope observation station data collection of monthly precipitation over the Maritime Continent from September 2010 to September 2017.

buku-mat-andat. Matematika Dasar: Pengantar Menuju Analisis Data

cepatBelajarCartopy. Merupakan tutorial singkat belajar pemetaan sederhana menggunakan Cartopy.

suppl_1d_nlse_pseudo_spectral. Simulation data and analysis scripts demonstrating a high-order pseudo-spectral solver for the 1D nonlinear Schrödinger equation across four canonical scenarios: single soliton, two-soliton collision, breather, and modulation instability.

suppl_kh2d-solver_paper. This repository contains the statistical analysis and visualization Python scripts used to process NetCDF simulation outputs and generate the figures and complexity metrics presented in the kh2d-solver paper on Kelvin-Helmholtz instability.

stats_compare_imc_ocean_lgm_lh. Python code and statistical analysis for comparing Last Glacial Maximum and Late Holocene oceanography in the Indonesian Maritime Continent

tsHydrochWP. Code and datasets for Long-term hydrometeorological time-series analysis over the central highlands of West Papua

1d-qt-ideal-solver. A high-performance 1D quantum tunneling solver using split-operator Fourier method with absorbing boundary conditions and Numba acceleration for simulating electron tunneling through potential barriers with proper probability conservation.

smdCompare. This repository contains supporting material for "Quantitative Performance Analysis of Spring-Mass-Damper Control Systems: A Comparative Implementation in Python and R"