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Bookmark or Share- python - Finding the average of a list - Stack OverflowThis is useful, if your data is massive and/or you need to perform off-the-cuff filtering before computing the mean. For example, if a list has NaN values averaging returns NaN. If you want to average the list while ignoring NaN values, you can filter out the NaN values and pass a generator to fmean:
- algorithm - Calculate distance between two latitude-longitude points ...To calculate the distance between two points on a sphere you need to do the Great Circle calculation. There are a number of C/C++ libraries to help with map projection at MapTools if you need to reproject your distances to a flat surface. To do this you will need the projection string of the various coordinate systems.
- performance - How do you calculate how much faster time X is from time ...I am of the believe that if you have a time of X seconds. X/2 (half as long) is 100% faster. My solution to this problem is calculated as (T2/T1)-1 . 1.3477/.6053 - 1 = 1.2265. Other people are saying that you should just look at these as numbers and calculate it like . 1- (T1/T2) 1- .6053/1.3477 = .5508 (the answers above are rounded).
- How to calculate percentage with a SQL statement@Digitalsa1nt (100 * 2) / 4 = 50, (2/4) * 100 = 50 as long as the enumerator is is the part being multiplied. Due to precedence of SQL statements it will be the same. however, due to data types if using 100 you can still get the result rounded to 0 decimals you desire for the % where as if you put it after the division operation you would have to make sure that you cast to a data type that can ...
- Big O, how do you calculate/approximate it? - Stack OverflowAs to "how do you calculate" Big O, this is part of Computational complexity theory. For some (many) special cases you may be able to come with some simple heuristics (like multiplying loop counts for nested loops), esp. when all you want is any upper bound estimation, and you do not mind if it is too pessimistic - which I guess is probably ...
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