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How to debug Ruby scripts [closed]
...ject (e.g. lines starting with app/... if you are using Rails). 99% of the time the problem is with your own code.
To illustrate why interpreting in this order is important...
E.g. a Ruby error message that confuses many beginners:
You execute code that at some point executes as such:
@foo = F...
What is “2's Complement”?
I'm in a computer systems course and have been struggling , in part, with Two's Complement . I want to understand it but everything I've read hasn't brought the picture together for me. I've read the wikipedia article and various other articles, including my text book .
...
After Installing Java JDK 7 For Mac OS X - mvn -version still shows java version 1.6.0_31
...lling Maven on a 64-bit Mac running Mac OSX 'Mavericks' save yourself some time and some hair pulling trying to get Maven installed. I was trying to follow this (which failed because the location of the java_home has changed on Mavericks:
http://maven.apache.org/download.cgi
I was pulling my hair ...
Javascript equivalent of Python's zip function
...s above
(Do note that the ... syntax may have performance issues at this time, and possibly in the future, so if you use the second answer with variadic arguments, you may want to perf test it.)
Here's a oneliner:
function zip(arrays) {
return arrays[0].map(function(_,i){
return ar...
Ruby: How to get the first character of a string
How can I get the first character in a string using Ruby?
13 Answers
13
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How to calculate moving average without keeping the count and data-total?
...t @Muis describes is an exponentially weighted moving averge, which is sometimes appropriate but is not precisely what the OP requested. As an example, consider the behaviour you expect when most of the points are in the range 2 to 4 but one value is upwards of a million. An EWMA (here) will hold ...
C++ convert from 1 char to string? [closed]
I need to cast only 1 char to string . The opposite way is pretty simple like str[0] .
2 Answers
...
%d,%c,%s,%x等转换符 释义 - C/C++ - 清泛IT论坛，有思想、有深度
...六进制整数0f(0F) e.g. 0x1234
%p 指针
%s 字符串 %S Unicode字符串（双字节）
%% "%"
2．标志
左对齐："-" e.g. "%-20s"
右对齐："+" e.g. "%+20s"
空格：若符号为正...
Get Slightly Lighter and Darker Color from UIColor
I was looking to be able to turn any UIColor into a gradient. The way I am intending to do this is by using Core Graphics to draw a gradient. What I am trying to do is to get a color, lets say:
...
How do I discover memory usage of my application in Android?
...nterpreting whatever numbers you get is extremely low. (Pretty much every time I look at memory usage numbers with other engineers, there is always a long discussion about what they actually mean that only results in a vague conclusion.)
Note: we now have much more extensive documentation on Manag...