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How to run multiple Python versions on Windows
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edited May 19 at 10:54
Piotr Dobrogost
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How to delete multiple values from a vector?
...e (1 : 10)
> remove <- c (2, 3, 5)
> a
[1] 10 5 2 7 1 6 3 4 8 9
> a %in% remove
[1] FALSE TRUE TRUE FALSE FALSE FALSE TRUE FALSE FALSE FALSE
> a [! a %in% remove]
[1] 10 7 1 6 4 8 9
Note that this will silently remove incomparables (stuff like NA or Inf) as well...
Summarizing multiple columns with dplyr? [duplicate]
... <dbl>
#> 1 1 3.08 2.98 2.98 2.91
#> 2 2 3.03 3.04 2.97 2.87
#> 3 3 2.85 2.95 2.95 3.06
If you want to summarize only certain columns, use summarise_at or summarise_if functions.
Alternatively, the purrrlyr package provides the same functionality:
library(purr...
“#include” a text file in a C program as a char[]
...r a[] = {
0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x0a
};
unsigned int a_len = 12;
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What is the purpose of base 64 encoding and why it used in HTTP Basic Authentication?
I don't get the Base64 encryption.
7 Answers
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Using print statements only to debug
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Matt JoinerMatt Joiner
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Bash: Copy named files recursively, preserving folder structure
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154
Have you tried using the --parents option? I don't know if OS X supports that, but that works on...
UnboundLocalError on local variable when reassigned after first use
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recursiverecursive
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Is there a way to iterate over a slice in reverse in Go?
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141
No there is no convenient operator for this to add to the range one in place. You'll have to do...
make: Nothing to be done for `all'
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124
Sometimes "Nothing to be done for all" error can be caused by spaces before command in makefile ...