Improvments to coerce_to_sparse_matrix()

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: sparsevctrs
 Title: Sparse Vectors for Use in Data Frames
-Version: 0.1.0.9001
+Version: 0.1.0.9002
 Authors@R: c(
     person("Emil", "Hvitfeldt", , "emil.hvitfeldt@posit.co", role = c("aut", "cre"),
            comment = c(ORCID = "0000-0002-0679-1945")),

NEWS.md

@@ -10,6 +10,10 @@
 
 * `is_sparse_vector()` has been rewritten for speed improvement. (#76)
 
+* Fixed bugs where `coerce_to_sparse_matrix()` would error for completely sparse columns. (#77)
+
+* `coerce_to_sparse_matrix()` Now turns dense zeroes into sparse zeroes. (#77)
+
 # sparsevctrs 0.1.0
 
 * Initial CRAN submission.

R/coerce.R

@@ -67,11 +67,27 @@ coerce_to_sparse_matrix <- function(x, call = rlang::caller_env(0)) {
   all_positions <- unlist(all_positions, use.names = FALSE)
   all_values <- unlist(all_values, use.names = FALSE)
 
+  # TODO: maybe faster to do this above?
+  non_zero <- all_values != 0
+  all_rows <- all_rows[non_zero]
+  all_positions <- all_positions[non_zero]
+  all_values <- all_values[non_zero]
+
+  n_row <- nrow(x)
+  n_col <- ncol(x)
+
+  if (identical(rownames(x), as.character(seq_len(nrow(x))))) {
+    row_names <- NULL
+  } else {
+    row_names <- rownames(x)
+  }
+
   res <- Matrix::sparseMatrix(
     i = all_positions,
     j = all_rows,
     x = all_values,
-    dimnames = list(rownames(x), colnames(x))
+    dims = c(n_row, n_col),
+    dimnames = list(row_names, colnames(x))
   )
   res
 }

tests/testthat/test-coerce.R

@@ -20,6 +20,270 @@ test_that("coerce_to_sparse_matrix() works", {
   expect_identical(res, exp)
 })
 
+test_that("coerce_to_sparse_matrix() with zero rows and columns", {
+  skip_if_not_installed("Matrix")
+
+  dat <- data.frame()
+  exp <- Matrix::Matrix(nrow = 0, ncol = 0, sparse = TRUE)
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(x = integer(), y = integer())
+  exp <- Matrix::Matrix(nrow = 0, ncol = 2, sparse = TRUE)
+  colnames(exp) <- c("x", "y")
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+
+  dat <- data.frame(x = 1:2)[, integer()]
+  exp <- Matrix::Matrix(nrow = 2, ncol = 0, sparse = TRUE)
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+})
+
+test_that("coerce_to_sparse_matrix() works with single all sparse vector", {
+  skip_if_not_installed("Matrix")
+
+  exp <- Matrix::Matrix(0, nrow = 10, ncol = 1, sparse = TRUE)
+  colnames(exp) <- c("x")
+
+  dat <- data.frame(x = rep(0, 10))
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(x = sparse_integer(integer(), integer(), 10))
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+})
+
+test_that("coerce_to_sparse_matrix() works with multiple all sparse vector", {
+  skip_if_not_installed("Matrix")
+
+  exp <- Matrix::Matrix(0, nrow = 10, ncol = 2, sparse = TRUE)
+  colnames(exp) <- c("x", "y")
+
+  dat <- data.frame(x = rep(0, 10), y = rep(0, 10))
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(
+    x = sparse_integer(integer(), integer(), 10),
+    y = sparse_integer(integer(), integer(), 10)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+})
+
+test_that("coerce_to_sparse_matrix() works with sparse between dense", {
+  skip_if_not_installed("Matrix")
+
+  exp <- Matrix::Matrix(c(1, 0, 0, 0, 0, 1), nrow = 2, ncol = 3, sparse = TRUE)
+  colnames(exp) <- c("x", "y", "z")
+
+  dat <- data.frame(
+    x = c(1, 0), 
+    y = c(0, 0), 
+    z = c(0, 1)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(
+    x = sparse_integer(1, 1, 2), 
+    y = c(0, 0), 
+    z = c(0, 1)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(
+    x = c(1, 0), 
+    y = c(0, 0), 
+    z = sparse_integer(1, 2, 2)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(
+    x = sparse_integer(1, 1, 2), 
+    y = c(0, 0), 
+    z = sparse_integer(1, 2, 2)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(
+    x = c(1, 0), 
+    y = sparse_integer(integer(), integer(), 2), 
+    z = c(0, 1)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(
+    x = sparse_integer(1, 1, 2), 
+    y = sparse_integer(integer(), integer(), 2), 
+    z = c(0, 1)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(
+    x = c(1, 0), 
+    y = sparse_integer(integer(), integer(), 2), 
+    z = sparse_integer(1, 2, 2)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(
+    x = sparse_integer(1, 1, 2), 
+    y = sparse_integer(integer(), integer(), 2), 
+    z = sparse_integer(1, 2, 2)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+})
+
+test_that("coerce_to_sparse_matrix() works with sparse before dense", {
+  skip_if_not_installed("Matrix")
+
+  exp <- Matrix::Matrix(c(0, 0, 0, 0, 0, 1), nrow = 3, ncol = 2, sparse = TRUE)
+  colnames(exp) <- c("x", "y")
+
+  dat <- data.frame(
+    x = c(0, 0, 0), 
+    y = c(0, 0, 1)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(
+    x = c(0, 0, 0), 
+    y = sparse_integer(1, 3, 3)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(
+    x = sparse_integer(integer(), integer(), 3), 
+    y = c(0, 0, 1)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(
+    x = sparse_integer(integer(), integer(), 3), 
+    y = sparse_integer(1, 3, 3)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+})
+
+test_that("coerce_to_sparse_matrix() works with sparse after dense", {
+  skip_if_not_installed("Matrix")
+
+  exp <- Matrix::Matrix(c(1, 0, 0, 0, 0, 0), nrow = 3, ncol = 2, sparse = TRUE)
+  colnames(exp) <- c("x", "y")
+
+  dat <- data.frame(
+    x = c(1, 0, 0), 
+    y = c(0, 0, 0)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(
+    x = sparse_integer(1, 1, 3),
+    y = c(0, 0, 0)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(
+    x = c(1, 0, 0),
+    y = sparse_integer(integer(), integer(), 3)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+
+  dat <- data.frame(
+    x = sparse_integer(1, 1, 3),
+    y = sparse_integer(integer(), integer(), 3)
+  )
+
+  expect_identical(
+    coerce_to_sparse_matrix(dat),
+    exp
+  )
+})
+
 test_that("coerce_to_sparse_matrix() errors on wrong input", {
   skip_if_not_installed("Matrix")