大约有 40,000 项符合查询结果（耗时：0.0475秒） [XML]
Why does changing 0.1f to 0 slow down performance by 10x?
...4,2.145,2.256,2.367,2.478,2.589,2.690};
float y[16];
for(int i=0;i<16;i++)
{
y[i]=x[i];
}
for(int j=0;j<9000000;j++)
{
for(int i=0;i<16;i++)
{
y[i]*=x[i];
y[i]/=z[i];
#ifdef FLOATING
y[i]=y[i]+0.1f;
...
What's the reason I can't create generic array types in Java?
...
How does ArrayList <SomeType> do it then?
– Thumbz
Mar 25 '14 at 23:55
10
...
Android Spinner: Get the selected item change event
...ectedListener() {
@Override
public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
// your code here
}
@Override
public void onNothingSelected(AdapterView<?> parentView) {
// your code here
}
});
T...
Exact time measurement for performance testing [duplicate]
... @ppejovic: If you're debugging then you should ignore all performance results completely. But JIT compilation occurs whether or not you're debugging, just with different optimizations.
– Jon Skeet
Oct 7 '11 at 20:29
...
How can I set the text of a WPF Hyperlink via data binding?
...n about 20 different places in our app. Hyperlink implicitly constructs a <Run/> if you put text in its "content", but in .NET 3.5 <Run/> won't let you bind to it, so you've got to explicitly use a TextBlock.
<TextBlock>
<Hyperlink Command="local:MyCommands.ViewDetails" Com...
Android Camera Preview Stretched
...os to get my Preview Size:
private Camera.Size getOptimalPreviewSize(List<Camera.Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 0.1;
double targetRatio=(double)h / w;
if (sizes == null) return null;
Camera.Size optimalSize = null;
double...
How to randomize (or permute) a dataframe rowwise and columnwise?
...df1
a b c
1 1 1 0
2 1 0 0
3 0 1 0
4 0 0 0
Shuffle row-wise:
> df2 <- df1[sample(nrow(df1)),]
> df2
a b c
3 0 1 0
4 0 0 0
2 1 0 0
1 1 1 0
By default sample() randomly reorders the elements passed as the first argument. This means that the default size is the size of the passed arra...
Can constructors be async?
...get” void, or Task.
If the constructor of type T actually returned Task<T>, that would be very confusing, I think.
If the async constructor behaved the same way as an async void method, that kind of breaks what constructor is meant to be. After constructor returns, you should get a fully i...
EF Code First “Invalid column name 'Discriminator'” but no inheritance
...nore a type that is not mapped to a database table
modelBuilder.Ignore<PersonViewModel>();
// ignore a property that is not mapped to a database column
modelBuilder.Entity<Person>()
.Ignore(p => p.FullName);
}
...
Unix command to prepend text to a file
...
Process Substitution
I'm surprised no one mentioned this.
cat <(echo "before") text.txt > newfile.txt
which is arguably more natural than the accepted answer (printing something and piping it into a substitution command is lexicographically counter-intuitive).
...and hijacking ...