How to convert a negative number to positive?
>>> n = -42 >>> -n # if you know n is negative 42 >>> abs(n) # for any n 42 Don’t forget to check the docs.
absolute-value
mongodb – Find document with closest integer value
Interesting problem. I don’t know if you can do it in a single query, but you can do it in two: var x = 1; // given integer closestBelow = db.test.find({ratio: {$lte: x}}).sort({ratio: -1}).limit(1); closestAbove = db.test.find({ratio: {$gt: x}}).sort({ratio: 1}).limit(1); Then you just check which of the two docs has the ratio closest to the … Read more
jfreechart customize piechart to show absolute values and percentages
Use the MessageFormat symbol {1} for the absolute section value. See StandardPieSectionLabelGenerator for details. public class MyMinimalPieChartExample { private static final String KEY1 = “Datum 1”; public static final String KEY2 = “Datum 2”; public static void main(String[] args) { DefaultPieDataset dataset = new DefaultPieDataset(); dataset.setValue(KEY1, 99); dataset.setValue(KEY2, 77); JFreeChart someChart = ChartFactory.createPieChart( “Header”, dataset, … Read more
Math.abs returns wrong value for Integer.Min_VALUE
Integer.MIN_VALUE is -2147483648, but the highest value a 32 bit integer can contain is +2147483647. Attempting to represent +2147483648 in a 32 bit int will effectively “roll over” to -2147483648. This is because, when using signed integers, the two’s complement binary representations of +2147483648 and -2147483648 are identical. This is not a problem, however, as … Read more