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Combine two data frames by rows (rbind) when they have different sets of columns
... Jyotirmoy BhattacharyaJyotirmoy Bhattacharya
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How can I count the number of matches for a regex?
...for Java 9+
long matches = matcher.results().count();
Solution for Java 8 and older
You'll have to do the following. (Starting from Java 9, there is a nicer solution)
int count = 0;
while (matcher.find())
count++;
Btw, matcher.groupCount() is something completely different.
Complete exam...
How to format a Java string with leading zero?
...
289
In case you have to do it without the help of a library:
("00000000" + "Apple").substring("App...
(-2147483648> 0) returns true in C++?
-2147483648 is the smallest integer for integer type with 32 bits, but it seems that it will overflow in the if(...) sentence:
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Getting image dimensions without reading the entire file
...x42, 0x4D }, DecodeBitmap},
{ new byte[]{ 0x47, 0x49, 0x46, 0x38, 0x37, 0x61 }, DecodeGif },
{ new byte[]{ 0x47, 0x49, 0x46, 0x38, 0x39, 0x61 }, DecodeGif },
{ new byte[]{ 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A }, DecodePng },
{ new byte[]{ 0xf...
How can I get a Bootstrap column to span multiple rows?
...br/>
</div>
</div>
<div class="col-md-8">
<div class="row">
<div class="col-md-6">
<div class="well">2</div>
</div>
<div class="col-md-6">
<...
How many files can I put in a directory?
...
FAT32:
Maximum number of files: 268,173,300
Maximum number of files per directory: 216 - 1 (65,535)
Maximum file size: 2 GiB - 1 without LFS, 4 GiB - 1 with
NTFS:
Maximum number of files: 232 - 1 (4,294,967,295)
Maximum file size
Implementa...
How to install Java 8 on Mac
I want to do some programming with the latest JavaFX, which requires Java 8. I'm using IntelliJ 13 CE and Mac OS X 9 Mavericks. I ran Oracle's Java 8 installer, and the files look like they ended up at
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