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Add up a column of numbers at the Unix shell
..... | paste -sd+ - | bc
is the shortest one I've found (from the UNIX Command Line blog).
Edit: added the - argument for portability, thanks @Dogbert and @Owen.
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ObservableCollection not noticing when Item in it changes (even with INotifyPropertyChanged)
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Doesn't this all depend on your understanding of the term changed? This could mean that a property of one of the elements in the collection has changed (which is how I think you are interpreting it) or it could mean that one of the elements of the collection has b...
How to programmatically set maxLength in Android TextView?
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This works for me, but in Android 5.1 you can still continue to type letters, the are yust "invisible" in the inputfield. But they are shown in the text proposal. And when you try to delete letters on the end.
– Radon8472
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If vs. Switch Speed
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They also convert to tree comparisons in some cases. The reasoning is somewhat complex but basically boils down to the table indirection neutering modern cpu jump target buffers and so wipes out the branch predictor. I vaguely recall...
When is an interface with a default method initialized?
....4.1 ought to cover this definitively. However, the behavior of Oracle JDK and OpenJDK (javac and HotSpot) differs from what's specified here. In particular, the Example 12.4.1-3 from this section covers interface initialization. The example as follows:
interface I {
int i = 1, ii = Test.out("i...
How do I print the full value of a long string in gdb?
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When I try this I only get: "Value can't be converted to integer."
– Philipp Ludwig
Jan 28 '19 at 12:57
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Benefits of inline functions in C++?
...fast CPUs, huge memory etc. (not like in the 1980< where memory was scarce and everything had to fit in 100KB of memory) what advantages do they really have today?
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Multi-gradient shapes
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I don't think you can do this in XML (at least not in Android), but I've found a good solution posted here that looks like it'd be a great help!
ShapeDrawable.ShaderFactory sf = new ShapeDrawable.ShaderFactory() {
@Override
public Shader resize(int width, int height) {
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What and where are the stack and heap?
... the CPU. This exceptional condition can then be caught by the runtime and converted into some kind of stack overflow exception.
Can a function be allocated on the heap instead of a stack?
No, activation records for functions (i.e. local or automatic variables) are allocated on the stack th...
Specifying and saving a figure with exact size in pixels
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I had same issue. I used PIL Image to load the images and converted to a numpy array then patched a rectangle using matplotlib. It was a jpg image, so there was no way for me to get the dpi from PIL img.info['dpi'], so the accepted solution did not work for me. But after some tinker...