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Determining complexity for recursive functions (Big O notation)

... 362 The time complexity, in Big O notation, for each function: int recursiveFun1(int n) { if (n...
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Big O, how do you calculate/approximate it?

... 23 Answers 23 Active ...
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Regular expression that matches valid IPv6 addresses

... 254 I was unable to get @Factor Mystic's answer to work with POSIX regular expressions, so I wrote...
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Code Golf - π day

... 26 Answers 26 Active ...
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Get operating system info

... 202 The code below could explain in its own right, how http://thismachine.info/ is able to show wh...
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How do I make a matrix from a list of vectors in R?

... 124 One option is to use do.call(): > do.call(rbind, a) [,1] [,2] [,3] [,4] [,5] [,6] ...
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What is the equivalent of MATLAB's repmat in NumPy

...gives a 3d output array as you would expect - matlab for some reason gives 2d output - but the content is the same). Matlab: >> repmat([1;1],[1,1,1]) ans = 1 1 Python: In [46]: a = np.array([[1],[1]]) In [47]: np.tile(a, [1,1,1]) Out[47]: array([[[1], [1]]]) ...
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App Inventor 2开发简单计算器 - App Inventor 2 中文网 - 清泛IT论坛,有思想、有深度

...就会出现一些莫名其妙的状况,这里要讲解的是一个只有20个按键的简易计算器,实现了加减乘除的简单运算,以及清除、回退、求相反数等,如图2-1所示,更为复杂的运算,如求乘方、方根及三角函数的运算,可以利用开发工...
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Is there a way to detect if an image is blurry?

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Are 2^n and n*2^n in the same time complexity?

... 232 You will have to go to the formal definition of the big O (O) in order to answer this question...