Top "Numerical" questions

This tag is for questions concerning problems using numbers which either cannot be exactly solved, or where the exact solution may be much more difficult to acquire than by using numerical methods.

SQL ORDER chars numerically

I have a column of numbers stored as chars. When I do a ORDER BY for this column I get …

sql char type-conversion sql-order-by numerical
What range of numbers can be represented in a 16-, 32- and 64-bit IEEE-754 systems?

I know a little bit about how floating-point numbers are represented, but not enough, I'm afraid. The general question is: …

floating-point precision numerical ieee-754
How do I type a floating point infinity literal in python

How do I type a floating point infinity literal in python? I have heard inf = float('inf') is non portable. …

python floating-point portability numerical
Convert numbers into corresponding letter using Python

I was wondering if it is possible to convert numbers into their corresponding alphabetical value. So 1 -> a 2 -&…

python python-3.x numerical alphabetical
How do I determine the standard deviation (stddev) of a set of values?

I need to know if a number compared to a set of numbers is outside of 1 stddev from the mean, …

c# math statistics numerical
How to detect significant change / trend in a time series data?

So I have an array of say 25 samples and I would want to be able to note the trends of …

algorithm statistics real-time signal-processing numerical
Any way faster than pow() to compute an integer power of 10 in C++?

I know power of 2 can be implemented using << operator. What about power of 10? Like 10^5? Is there any way …

c++ numerical
Derivatives in C/C++?

I have some expressions such as x^2+y^2 that I'd like to use for some math calculations. One of the …

c++ c math numerical symbolic-math
Open source alternative to MATLAB's fmincon function?

Is there an open-source alternative to MATLAB's fmincon function for constrained linear optimization? I'm rewriting a MATLAB program to use …

python matlab numpy numerical scientific-computing
Does JavaScript have double floating point number precision?

I know it's an odd question, but does JavaScript have the capacity to work with double's as opposed to single …

javascript floating-point numerical double-precision