Below, find more information about the main software development projects that I have been working on.

R packages:

[1] mRpostman: An IMAP Client for R
Description: mRpostman is an easy-to-use IMAP client that provides tools for message searching, selective fetching of message attributes, mailbox management, attachment extraction, and several other IMAP features, paving the way for email data analysis in R. [Official website] [CRAN] [Github]


# how to download attachment files of selected messages:
# configure the IMAP connection:
con <- configure_imap(
# select folder
con$select_folder(name = "INBOX")
# search by date and fetch messages
con$search_on(date_char = "24-Nov-2020") %>%

[2] emstreeR: Tools for Fast Computing and Plotting Euclidean Minimum Spanning Trees
Description: emstreeR is a package for fast and easily computing Euclidean Minimum Spanning Trees (EMST). It heavily relies on {RcppMLPACK} and {Rcpp}, working as a wrapper for the fast EMST Dual-Tree Boruvka algorithm (March, Ram, Gray, 2010)1 implemented in mlpack - the C++ Machine Learning library (Curtin, 2013)2. The package also provides functions and an S3 method for readily plotting Minimum Spanning Trees (MST) using either R {base}, {scatterplot3d} or {ggplot2} style. [CRAN] [Github]


# finding an EMST in 3D data:
# generating artificial data
n = 99
d1 <- matrix(rnorm(n, mean = -2, sd = .5), n/3, 3) # 3d
d2 <- matrix(rnorm(n, mean = 0, sd = .3), n/3, 3)
d3 <- matrix(rnorm(n, mean = 3, sd = .4), n/3, 3)
d <- rbind(d1,d2,d3) # showing a matrix input
# MST:
out <- ComputeMST(d, verbose = FALSE)
# plot:
plotMST3D(out, xlab = "xaxis", col.pts = "orange", col.segts = "red", main = "a simple MST 3D plot")

[3] onlineretail: Online Retail Dataset
Description: Transactions occurring for a UK-based and registered, non-store online retail between 01/12/2010 and 09/12/2011. The dataset is included in this package with the donor’s permission, Dr. Daqing Chen.3 4. [CRAN] [Github]


# how to load the data:

Private R packages:

[4] proPNLD: An R package to forecast the number of students in all Brazilian schools and grades for the PNLD program
Description: Execute the two-step-forecasting (h=2) on the number of students in each grade in every Brazilian public school, fitting more than 800,000 Holt-Winters Exponential Smoothing time-series models. [Github]

Other software:

[1] FisFa: Fiscaliza Fatura - contract invoice analysis automation (discontinued) Description: FisFa is a software developed (mostly) in R and Python. Its aim is to automate contract management tasks in Fies - the Brazilian Higher Education Fund. Previously to FisFa, contract invoices from banks used to take more than two weeks to be analyzed by the Fund staff. After FisFa, this time has dropped to roughly 1 minute. The quality of the analysis also has considerably improved. FisFa provides several reports about the invoice and also indicates possible errors in data. Due to monthly errors found by FisFa in the invoices, the Brazilian Government saved more than US$50 million between 2016 and 2018.
License: FisFa is registered under the Brazilian Patent BR 51 2016 000212 3. Awards: As a recognition for the aforementioned results, the software received two national recognition awards:

FisFa screenshot

FisFa screenshot

  1. WB.March, P.Ram, AG.Gray (2010). Fast Euclidian minimum spanning tree: algorithm analysis, and applications. 16th ACM SIGKDD International Conference on Knowledge Discovery and Data mining, July 25-28 2010. Washington, DC, USA, doi:10.1145/1835804.1835882. ↩︎

  2. RR.Curtin et al. (2013). Mlpack: A scalable C++ machine learning library. Journal of Machine Learning Research, v. 14, 2013. ↩︎

  3. D.Chen, S.Sain, K.Guo (2012), Data mining for the online retail industry: A case study of RFM model-based customer segmentation using data mining, Journal of Database Marketing and Customer Strategy Management, Vol. 19, No. 3, pp. 197-208, 2012 (Published online before print: 27 August 2012. doi:10.1057/dbm.2012.17. ↩︎

  4. Dr. Dqing’s ResearchGate page ↩︎