From 4810df7fb979fb8920f8636ccb80a59eff2286c6 Mon Sep 17 00:00:00 2001
From: Waldir Leoncio <waldir.leoncio@gmail.com>
Date: Tue, 3 Mar 2020 13:51:04 +0100
Subject: [PATCH] Added translated function + unit tests

---
 R/strcmp.R                                   | 28 ++++++++++++++++++++
 man/strcmp.Rd                                | 19 +++++++++++++
 tests/testthat/test-convertedBaseFunctions.R | 17 ++++++++++++
 3 files changed, 64 insertions(+)
 create mode 100644 R/strcmp.R
 create mode 100644 man/strcmp.Rd

diff --git a/R/strcmp.R b/R/strcmp.R
new file mode 100644
index 0000000..c64cbce
--- /dev/null
+++ b/R/strcmp.R
@@ -0,0 +1,28 @@
+#' @title Compare two character elements
+#' @description Logical test if two character elements are identical
+#' @param s1 first character element (string, vector or matrix)
+#' @param s2 second character element (string, vector or matrix)
+#' @return a logical element of the same type as the input
+#' @export
+strcmp <- function(s1, s2) {
+    if (length(s1) == 1 & length(s2) == 1) {
+        # Both are scalars, comparison is straightforward
+        return(identical(s1, s2))
+    } else if (length(s1) == 1 & length(s2) > 1) {
+        # s1 is a scalar and s2 is a vector or a matrix
+        checks <- sapply(s2, function(s) s1 %in% s)
+        if (is(s2, "matrix")) checks <- matrix(checks, nrow(s2))
+    } else if (length(s1) > 1 & length(s2) == 1) {
+        # s1 is a vector/matrix, s2 is a scalar
+        checks <- sapply(s1, function(s) s2 %in% s)
+        if (is(s1, "matrix")) checks <- matrix(checks, nrow(s1))
+    } else {
+        # s1 and s2 are vectors/matrices
+        if (identical(dim(s1), dim(s2))) {
+            checks <- as.matrix(s4 == s5)
+        } else {
+            stop("Inputs must be the same size or either one can be a scalar.")
+        }
+    }
+    return(checks)
+}
\ No newline at end of file
diff --git a/man/strcmp.Rd b/man/strcmp.Rd
new file mode 100644
index 0000000..b832fa9
--- /dev/null
+++ b/man/strcmp.Rd
@@ -0,0 +1,19 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/strcmp.R
+\name{strcmp}
+\alias{strcmp}
+\title{Compare two character elements}
+\usage{
+strcmp(s1, s2)
+}
+\arguments{
+\item{s1}{first character element (string, vector or matrix)}
+
+\item{s2}{second character element (string, vector or matrix)}
+}
+\value{
+a logical element of the same type as the input
+}
+\description{
+Logical test if two character elements are identical
+}
diff --git a/tests/testthat/test-convertedBaseFunctions.R b/tests/testthat/test-convertedBaseFunctions.R
index 5683637..b94ab16 100644
--- a/tests/testthat/test-convertedBaseFunctions.R
+++ b/tests/testthat/test-convertedBaseFunctions.R
@@ -111,4 +111,21 @@ test_that("isfield works as on Matlab", {
         object = isfield(S, c("x", "y", "z", "title", "error")),
         expected = c(TRUE, TRUE, FALSE, TRUE, FALSE)
     )
+})
+
+test_that("strcmp works as expected", {
+    yes <- 'Yes'
+    no <- 'No'
+    ja <- 'Yes'
+    expect_false(strcmp(yes, no))
+    expect_true(strcmp(yes, ja))
+    s1 <- 'upon'
+    s2 <- matrix(c('Once', 'upon', 'a', 'time'), 2, byrow=TRUE)
+    s3 <- c('Once', 'upon', 'a', 'time')
+    s4 <- matrix(c("A", "bc", "def", "G"), 2, byrow=TRUE)
+    s5 <- matrix(c("B", "c", "def", "G"), 2, byrow=TRUE)
+    expect_equal(strcmp(s1, s2), matrix(c(FALSE, FALSE, TRUE, FALSE), 2))
+    expect_equivalent(strcmp(s1, s3), c(FALSE, TRUE, FALSE, FALSE))
+    expect_error(strcmp(s2, s3))
+    expect_equal(strcmp(s4, s5), matrix(c(FALSE, TRUE, FALSE, TRUE), 2))
 })
\ No newline at end of file