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How to round a number to n decimal places in Java

...ngMode(RoundingMode.CEILING); for (Number n : Arrays.asList(12, 123.12345, 0.23, 0.1, 2341234.212431324)) { Double d = n.doubleValue(); System.out.println(df.format(d)); } gives the output: 12 123.1235 0.23 0.1 2341234.2125 EDIT: The original answer does not address the accuracy of th...
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Which is better, number(x) or parseFloat(x)?

... same: parseFloat('3'); // => 3 Number('3'); // => 3 parseFloat('1.501'); // => 1.501 Number('1.501'); // => 1.501 parseFloat('1e10'); // => 10000000000 Number('1e10'); // => 10000000000 So as long as you have standard numeric input, there's no difference. However, if your input...
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Create an index on a huge MySQL production table without table locking

... [2017] Update: MySQL 5.6 has support for online index updates https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-operations.html#online-ddl-index-syntax-notes In MySQL 5.6 and higher, the table remains available for...
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Calculate the center point of multiple latitude/longitude coordinate pairs

...ing them has weird edge cases with angles when they wrap from 359' back to 0'. A much earlier question on SO asked about finding the average of a set of compass angles. An expansion of the approach recommended there for spherical coordinates would be: Convert each lat/long pair into a unit-lengt...
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Remove border from IFrame

... capital ‘B’). So it would look like: <iframe src="myURL" width="300" height="300" frameBorder="0">Browser not compatible.</iframe> share | improve this answer | ...
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Seeding the random number generator in Javascript

...| edited May 23 '17 at 12:02 Community♦ 111 silver badge answered Feb 6 '09 at 17:42 ...
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HTML5 Email Validation

... 120 In HTML5 you can do like this: <form> <input type="email" placeholder="Enter your emai...
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How do I catch a numpy warning like it's an exception (not just for testing)?

... 205 It seems that your configuration is using the print option for numpy.seterr: >>> impo...
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Minimizing NExpectation for a custom distribution in Mathematica

...f we plot pdf2 it looks exactly as your Plot Plot[pdf2[3.77, 1.34, -2.65, 0.40, x], {x, 0, .3}] Now to the expected value. If I understand it correctly we have to integrate x * pdf[x] from -inf to +inf for a normal expected value. x * pdf[x] looks like Plot[pdf2[3.77, 1.34, -2.65, 0.40, x]*x...
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How to refresh app upon shaking the device?

... public void onSensorChanged(SensorEvent se) { float x = se.values[0]; float y = se.values[1]; float z = se.values[2]; mAccelLast = mAccelCurrent; mAccelCurrent = (float) Math.sqrt((double) (x*x + y*y + z*z)); float delta = mAccelCurrent - mAccelLast; mAcc...