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Hashing a file in Python
...nto the habit of following pep-8. For example, in python variables are typically underscore separated not camelCased. But that's just style and no one really cares about those things except people who have to read bad style... which might be you reading this code years from now.
...
Cluster analysis in R: determine the optimal number of clusters
...uld be indicated by this method:
Two. You can do partitioning around medoids to estimate the number of clusters using the pamk function in the fpc package.
library(fpc)
pamk.best <- pamk(d)
cat("number of clusters estimated by optimum average silhouette width:", pamk.best$nc, "\n")
plot(pam(d...
Most efficient conversion of ResultSet to JSON?
... tests. You could probably make it more elegant with a HashMap lookup to a callback but I doubt it would be any faster. As to memory, this is pretty slim as is.
Somehow I doubt this code is actually a critical bottle neck for memory or performance. Do you have any real reason to try to optimize it...
How do you determine the size of a file in C?
... code, use fseek + ftell as proposed by Derek. No. The C Standard specifically states that fseek() to SEEK_END on a binary file is undefined behavior. 7.19.9.2 The fseek function ... A binary stream need not meaningfully support fseek calls with a whence value of SEEK_END, and as noted below, whi...
How to create the branch from specific commit in different branch
...ev. Branching out from a commit of master (older than the merge) won't provide you with the changes of dev.
If you want to permanently integrate new changes from master into your feature branches, you should merge master into them and go on. This will create merge commits in your feature branches...
What is the difference between the template method and the strategy patterns?
...a client invokes methods of the template's external interface the template calls its abstract methods (its internal interface) as required to invoke the algorithm.
class ConcreteAlgorithm : AbstractTemplate
{
void DoAlgorithm(int datum) {...}
}
class AbstractTemplate
{
void run(int datum) ...
Linq Query keeps throwing “Unable to create a constant value of type System.Object…”, Why?
...
In my case, I changed the direct call of (sender as Button).Text to indirect call using a temp var, has worked.
working code:
private void onTopAccBtnClick(object sender, EventArgs e)
{
var name = (sender as Button).Text;
accountBinding...
Is there a way to auto-adjust Excel column widths with pandas.ExcelWriter?
... FYI: In my case I needed to use "index=False" in the "df.to_excel(...)" call, or else the columns were off by 1
– denvar
Jan 12 '17 at 4:20
1
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What is the most efficient way of finding all the factors of a number in Python?
...solving Project Euler puzzles myself. In some problems, a divisor check is called inside two nested for loops, and the performance of this function is thus essential.
Combining this fact with agf's excellent solution, I've ended up with this function:
from math import sqrt
def factors(n):
...
What is “:-!!” in C code?
...
sizeof(struct { int: -!!(e); }))
(e): Compute expression e.
!!(e): Logically negate twice: 0 if e == 0; otherwise 1.
-!!(e): Numerically negate the expression from step 2: 0 if it was 0; otherwise -1.
struct{int: -!!(0);} --> struct{int: 0;}: If it was zero, then we declare a struct with an a...