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Creating an R dataframe row-by-row
...de in R.
If you can, allocate your entire data.frame up front:
N <- 1e4 # total number of rows to preallocate--possibly an overestimate
DF <- data.frame(num=rep(NA, N), txt=rep("", N), # as many cols as you need
stringsAsFactors=FALSE) # you don't know levels yet...
C++ Convert string (or char*) to wstring (or wchar_t*)
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244
Assuming that the input string in your example (おはよう) is a UTF-8 encoded (which it isn'...
Convert an NSURL to an NSString
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684
In Objective-C:
NSString *myString = myURL.absoluteString;
In Swift:
var myString = myURL.ab...
汇编语言超浓缩教程（汇编入门必备） - C/C++ - 清泛网 - 专注C/C++及内核技术
...推出至今，其CPU发展过程为：8086→80286→80386→80486→PENTIUM →……，还有AMD、CYRIX等旁支。后面兼容前面CPU的功能，只不过多了些指令（如多能奔腾的MMX指令集）、增大了寄存器（如386的32位EAX）、增多了寄存器（如48...
How can I convert an image into Base64 string using JavaScript?
I need to convert my image to a Base64 string so that I can send my image to a server.
13 Answers
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How do I escape characters in c# comments?
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144
If you need to escape characters in XML comments, you need to use the character entities, so &l...
Tools for making latex tables in R [closed]
...roduce tables for different regression objects. One such example is the lme4 memisc code shown in the question. It might make sense to start a github repository to collect such code snippets, and over time maybe even add it to the memisc package. Any takers?
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static function in C
... (basically same .c file) as f1 */
}
int f2(int foo) {
return 42 + foo;
}
main.c:
int f1(int); /* prototype */
int f2(int); /* prototype */
int main(void) {
f1(10); /* ok, f1 is visible to the linker */
f2(12); /* nope, f2 is not visible to the linker */
return 0;
}
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copying all contents of folder to another folder using batch file?
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edited Apr 14 '15 at 17:55
gunr2171
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