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Subtract two variables in Bash
...Finally this worked - let "sanity_check_duration=sanity_check_duration_end_time_delay_sec - sanity_check_duration_start_time_delay_sec" (removing dollar sign from variables)
– Sandeepan Nath
Feb 28 '17 at 14:56
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Python os.path.join on Windows
I am trying to learn python and am making a program that will output a script. I want to use os.path.join, but am pretty confused. According to the docs if I say:
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如何选择机器学习算法 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
如何选择机器学习算法Choosing-a-Machine-Learning-Classifier如何针对某个分类问题决定使用何种机器学习算法？ 当然，如果你真心在乎准确率，最好的途径就是测试一大堆各式各样的算法（同时确保在每个算法上也测试不同的参数），...
Why did Rails4 drop support for “assets” group in the Gemfile
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+1 @gucki and load time. This was my understanding of the groups.. Since there was already a config option to disable live compile anyway. What does "support" amount to here. afaik my Rails 3 app had a line in env/prod.rb which loaded assets ju...
Calculating Pearson correlation and significance in Python
I am looking for a function that takes as input two lists, and returns the Pearson correlation , and the significance of the correlation.
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Unable to Connect to GitHub.com For Cloning
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Any advice on what to do if HTTPS is getting timed out as well?
– gjw80
Dec 12 '14 at 14:30
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Why does String.valueOf(null) throw a NullPointerException?
...ation, it is necessary to choose one to provide the descriptor for the run-time method dispatch. The Java programming language uses the rule that the most specific method is chosen.
A char[] is-an Object, but not all Object is-a char[]. Therefore, char[] is more specific than Object, and as specif...
Pointer arithmetic for void pointer in C
When a pointer to a particular type (say int , char , float , ..) is incremented, its value is increased by the size of that data type. If a void pointer which points to data of size x is incremented, how does it get to point x bytes ahead? How does the compiler know to add x to value of ...
What requirement was the tuple designed to solve?
...Bushkin is expressing a feature request that the design team hears all the time: the desire to make a "record type" of some kind without the trouble and expense of making an entire class just to hold together a few fields. C# already has this feature for methods; it's called the "parameter list".
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Mongo interface [closed]
...named MongoBug, it's super buggy ... I can't recommend it. Crashes all the time*.
– Justin Jenkins
Dec 5 '12 at 6:32
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