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Pass a data.frame column name to a function
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109
You can just use the column name directly:
df <- data.frame(A=1:10, B=2:11, C=3:12)
fun1 &l...
What is the meaning of the term arena in relation to memory?
... For example:
char * arena = malloc(HUGE_NUMBER);
unsigned int current = 0;
void * my_malloc(size_t n) { current += n; return arena + current - n; }
The point is that you get full control over how the memory allocation works. The only thing outside your control is the single library call for th...
Using do block vs braces {}
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102
Ruby cookbook says bracket syntax has higher precedence order than do..end
Keep in mind tha...
What's the difference between Sender, From and Return-Path?
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answered Dec 6 '10 at 14:37
Shawn D.Shawn D.
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How to detect my browser version and operating system using JavaScript?
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10 Answers
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What, why or when it is better to choose cshtml vs aspx?
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edited Jun 6 '12 at 12:06
answered Jun 6 '12 at 11:50
Jo...
How do I check if a number is a palindrome?
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50 Answers
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Why do == comparisons with Integer.valueOf(String) give different results for 127 and 128?
...otoMakoto
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How can I get the list of a columns in a table for a SQLite database?
...a table_info(table_name) statement:
sqlite> pragma table_info(people);
0|first_name|varchar|0||0
1|last_name|varchar|0||0
2|email_address|varchar|0||0
For more information on the pragma statements, see the documentation.
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How to start two threads at “exactly” the same time
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edited Mar 24 '14 at 16:01
answered Jul 31 '10 at 3:14
En...