98 lines
1.7 KiB
Plaintext
98 lines
1.7 KiB
Plaintext
<%@include file="includes/setup.md.rsp"%>
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<%@string fcnname="product"%>
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<% fcnname <- "<%@string name="fcnname"%>" %>
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<%@meta title="${fcnname}() benchmarks"%>
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<%@meta author="Henrik Bengtsson"%>
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<%@meta date="2014-06-04"%>
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<%@include file="${header}"%>
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# <%@meta name="title"%>
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This report benchmark the performance of <%=fcnname%>() against alternative methods.
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## Alternative methods
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* product_R()
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* prod()
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where
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```r
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<%=withCapture({
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product_R <- function(x, na.rm = FALSE, ...) {
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# Nothing todo?
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if (length(x) == 0L) return(0);
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# Any missing values?
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if (na.rm) {
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x <- x[!is.na(x)];
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}
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# Any zeros?
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if (is.integer(x) && any(x == 0)) return(0);
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# Calculate product via logarithmic sum
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sign <- if (sum(x < 0) %% 2 == 0) +1 else -1;
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x <- abs(x);
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x <- log(x);
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x <- sum(x, na.rm = FALSE);
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x <- exp(x);
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y <- sign*x;
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y;
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} # product_R()
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})%>
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```
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## Data
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```r
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<%=withCapture({
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<%@include file="R/random-vectors.R"%>
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data <- rvectors(mode = "double")
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data <- data[1:4]
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})%>
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```
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## Results
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<% for (ii in seq_along(data)) { %>
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<%
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dataLabel <- names(data)[ii]
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message(dataLabel)
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x <- data[[dataLabel]]
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gc()
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%>
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### <%=dataLabel%> vector
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```r
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<%=withCapture({
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x <- data[[.dataLabel.]]
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gc()
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stats <- microbenchmark(
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product = product(x, na.rm = FALSE),
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product_R = product_R(x, na.rm = FALSE),
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prod = prod(x, na.rm = FALSE),
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unit = "ms"
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)
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})%>
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```
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<% benchmarkResults(stats, tags=dataLabel) %>
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<% } # for (ii ...) %>
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<%@include file="${footer}"%>
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<%---------------------------------------------------------------------------
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HISTORY:
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2014-06-02
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o Created.
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---------------------------------------------------------------------------%>
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