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How to compare two colors for similarity/difference
...difference in percentage.
(pctDiffRed + pctDiffGreen + pctDiffBlue) / 3 * 100
Which would give you a difference in percentage between c1 and c2.
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How to add a new row to an empty numpy array
...g the loop:
In [210]: %%timeit
.....: l = []
.....: for i in xrange(1000):
.....: l.append([3*i+1,3*i+2,3*i+3])
.....: l = np.asarray(l)
.....:
1000 loops, best of 3: 1.18 ms per loop
In [211]: %%timeit
.....: a = np.empty((0,3), int)
.....: for i in xrange(1000):
.......
How to write a Unit Test?
...wered Jan 5 '12 at 23:48
jayunit100jayunit100
15.9k1919 gold badges8080 silver badges145145 bronze badges
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API pagination best practices
...onsidered paginating with a timestamp field?
When you query /foos you get 100 results. Your API should then return something like this (assuming JSON, but if it needs XML the same principles can be followed):
{
"data" : [
{ data item 1 with all relevant fields },
{ data i...
Creating a BLOB from a Base64 string in JavaScript
...n server, when users were using Chrome or IE to download files larger than 100mb. We found that the in IE following line was raising memory exception "var byteNumbers = new Array(slice.length)". However in chrome, it was the for loop causing same issue. We couldn't find a proper resolution to this i...
CSS customized scroll bar in div
...ath.max(30, (offsetDim * offsetDim / scrollDim));
slider.style.width = 100 * sliderPx / offsetDim + '%';
slider.className = 'slider';
bar.className = isX ? 'h bar' : 'v bar';
bar.appendChild(slider);
myscroll.appendChild(bar);
bar.addEventListener('click', bar_clicked);
...
When should we use intern method of String on String literals
...as a banking application, and things like the names of a modest set (maybe 100 or 200) corporations appeared all over the place. The data structures were already large, and if all those corp names had been unique objects they would have overflowed memory. Instead, all the data structures had referen...
How do you plot bar charts in gnuplot?
...id
plot "data.dat" using 1:3:xtic(2) with boxes
data.dat:
0 label 100
1 label2 450
2 "bar label" 75
If you want to style your bars differently, you can do something like:
set style line 1 lc rgb "red"
set style line 2 lc rgb "blue"
set style fill solid
set boxwidth 0.5
plot "dat...
Simple proof that GUID is not unique [closed]
... args)
{
//var reserveSomeRam = new byte[1024 * 1024 * 100]; // This indeed has no effect.
Console.WriteLine("{0:u} - Building a bigHeapOGuids.", DateTime.Now);
// Fill up memory with guids.
var bigHeapOGuids = new HashSet<Guid>();
...
How to use the 'sweep' function
...want to standardize data based on them):
df=matrix(sample.int(150, size = 100, replace = FALSE),5,5)
df_means=t(apply(df,2,mean))
df_sds=t(apply(df,2,sd))
df_T=sweep(sweep(df,2,df_means,"-"),2,df_sds,"/")*10+50
This code convert raw scores to T scores (with mean=50 and sd=10):
> df
[,1...