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“PKIX path building failed” and “unable to find valid certification path to requested target”
... what was the root cause. what made it to fail with java 6 certs.. and how does the java 7 certs fixed the problem
– Vishwanath gowda k
Oct 29 '14 at 7:01
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Principal component analysis in Python
...e to use principal component analysis (PCA) for dimensionality reduction. Does numpy or scipy already have it, or do I have to roll my own using numpy.linalg.eigh ?
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MySQL indexes - what are the best practices?
...t I will be searching or selecting using a WHERE clause but sometimes it doesn't seem so black and white.
7 Answers
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How do I fix the Visual Studio compile error, “mismatch between processor architecture”?
...dencies. Proper separation of GUI from logic goes a long way (although it does still have its limits, such as when the native code is rendering part of the GUI, but then designer support is a lost cause unless you do builds of the entire project for both x86 and x64)
– Ben Voi...
How to copy an object in Objective-C
.... In this, we just copy the memory bit for bit - this is what NSCopyObject does. Nearly always, it's not what you want. Objects have internal state, other objects, etc, and often make assumptions that they're the only ones holding references to that data. Bitwise copies break this assumption.
A deep...
Shall we always use [unowned self] inside closure in Swift
...cle on this extending this answer (looking into SIL to understand what ARC does), check it out here.
Original answer
The previous answers don't really give straightforward rules on when to use one over the other and why, so let me add a few things.
The unowned or weak discussion boils down to a ques...
What is the difference between == and equals() in Java?
...l only compare what it is written to compare, no more, no less.
If a class does not override the equals method, then it defaults to the equals(Object o) method of the closest parent class that has overridden this method.
If no parent classes have provided an override, then it defaults to the method...
What are JavaScript's builtin strings?
...e code" was unpredictable between Firefox and Chrome. This solve that but doesn't work in IE10 (where it returns "i"). Still I wonder if this option might offer some fresh ideas
– Jason Sperske
Apr 12 '13 at 22:38
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Why can't C++ be parsed with a LR(1) parser?
...). Moreover, the citation mentions the ambiguity of C but the explanation, does not show an ambiguity, but only a non ambiguous example where parsing decision can only be taken after an arbitrary long look-ahead.
– dodecaplex
Nov 13 '19 at 10:16
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android splash screen sizes for ldpi,mdpi, hdpi, xhdpi displays ? - eg : 1024X768 pixels for ldpi
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Why does this have so many upvotes? xlarge != xhdpi, they're measuring two totally different things. Those dp sizes are listed for the size buckets, not density.
– Geobits
Oct 4 '13 at 13:07...