This morning, I found the default behavior of the mclapply() function not quite different from the one of the lapply(). After quick investigation, I found is was due to an option not correctly set: the number of core to use.
> getOption("cores")
NULL
I must then overwrite the default mc.cores option of the mclapply()
Category: programming Tagged: R programming useless
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This a retranscription of a post on stackoverflow.
Category: programming Tagged: R Stack Overflow programming
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Category: how to Tagged: Aggregate Group by R SQL programming
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Evaluation of occupation type over a grid (Photo credit: Wikipedia)
For some application, it is usefull to evaluate some physical value over a grid. For each dimension of the grid, the order of magnitude to use is not obvious.Watch movie online The Transporter Refueled (2015)
the function …
Category: tools Tagged: Programming R Regular grid how to programming
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Category: R Tagged: ASCII Escape sequence Quotation mark R
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binary conversion (Photo credit: Wikipedia)
I want to retrieve the binary representation (as a string of 0 and 1) of an IPv4 address ( human readable string representation) using only R functions.
The following steps and functions can be used:
| step | tool |
|---|---|
| separate each octet | strsplit(x, split=”[.]”) |
| convert integer to … |
Category: how to Tagged: IP address IPv4 how to programming R
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I wanted to use multithreading in R. I'm used to C pthread mechanism, but I want to use some R functions. This functions run independently on separate data, and treatments can take some time.
In short, what …
Category: programming Tagged: C CRAN Multithread POSIX Threads Programming R Threads
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