Dear all,
I wrote a function using Rcpp; it is a simple function; however, it significantly improves the performance. I realized that on some systems, the result of the function is different from others. For example, on the following systems (on rhub), the results are identical and are correct: - Fedora Linux, R-devel, clang, gfortran (fedora-clang-devel) - macOS 10.13.6 High Sierra, R-release, brew (macos-highsierra-release) - Windows Server 2008 R2 SP1, R-devel, 32/64 bit (windows-x86_64-devel) However, on the following systems (on rhub), the results are different: - Ubuntu Linux 20.04.1 LTS, R-devel, GCC (ubuntu-gcc-devel) Here is the error: Running the tests in ‘tests/testthat.R’ failed. Last 13 lines of output: val[1] not equal to 4. 1/1 mismatches [1] 2 - 4 == -2 ── Failure (test-compute_closest_wgps_helper.R:12:3): compute_closest_wgps_helper works as expected. ── val[3] not equal to 3. 1/1 mismatches [1] 1 - 3 == -2 ── Failure (test-compute_closest_wgps_helper.R:13:3): compute_closest_wgps_helper works as expected. ── val[4] not equal to 1. 1/1 mismatches [1] 2 - 1 == 1 [ FAIL 3 | WARN 0 | SKIP 0 | PASS 69 ] As much as I can check the code, it looks correct. But I am not sure what else I can check. Some package users claimed that different R versions provide different results; however, I checked it on r-base=3.6, 4.0, 4.1 and received the same correct results (macOS 11.2). I would be grateful if you could let me know your thoughts about this issue. Here is the source code: https://github.com/fasrc/CausalGPS/blob/97342ecc90fd20f2c7c4458a70aefe471b09510c/src/compute_closest_wgps_helper.cpp Here is the related test: https://github.com/fasrc/CausalGPS/blob/97342ecc90fd20f2c7c4458a70aefe471b09510c/tests/testthat/test-compute_closest_wgps_helper.R Best regards, Naeem Khoshnevis
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