本文整理了Java中java.lang.Math.log10()方法的一些代码示例，展示了Math.log10()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Math.log10()方法的具体详情如下：
包路径：java.lang.Math
类名称：Math
方法名：log10
[英]Returns the closest double approximation of the base 10 logarithm of the argument. The returned result is within 1 ulp (unit in the last place) of the real result.
Special cases:
代码示例来源：origin: stackoverflow.com
int n = 1000;
int length = (int)(Math.log10(n)+1);代码示例来源：origin: hankcs/HanLP
public double weight(int feature, int tf)
{
if (feature >= df.length) System.err.println(feature);
return Math.log10(tf + 1) * (Math.log10((double) numDocs / df[feature] + 1)); // 一种改进的tf*idf计算方式;
}
}代码示例来源：origin: mrniko/netty-socketio
public static byte[] longToBytes(long number) {
// TODO optimize
int length = (int)(Math.log10(number)+1);
byte[] res = new byte[length];
int i = length;
while (number > 0) {
res[--i] = (byte) (number % 10);
number = number / 10;
}
return res;
}代码示例来源：origin: stackoverflow.com
public static String readableFileSize(long size) {
if(size <= 0) return "0";
final String[] units = new String[] { "B", "kB", "MB", "GB", "TB" };
int digitGroups = (int) (Math.log10(size)/Math.log10(1024));
return new DecimalFormat("#,##0.#").format(size/Math.pow(1024, digitGroups)) + " " + units[digitGroups];
}代码示例来源：origin: neo4j/neo4j
private static int numberOfDigits( long value )
{
return max( 1, (int)(log10( value ) + 1) );
}代码示例来源：origin: deathmarine/Luyten
public String getReadableFileSize() {
if (size <= 0)
return "0";
final String[] units = new String[] { "B", "KB", "MB", "GB", "TB" };
int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) + " " + units[digitGroups];
}
}代码示例来源：origin: PhilJay/MPAndroidChart
/**
* rounds the given number to the next significant number
*
* @param number
* @return
*/
public static float roundToNextSignificant(double number) {
if (Double.isInfinite(number) ||
Double.isNaN(number) ||
number == 0.0)
return 0;
final float d = (float) Math.ceil((float) Math.log10(number < 0 ? -number : number));
final int pw = 1 - (int) d;
final float magnitude = (float) Math.pow(10, pw);
final long shifted = Math.round(number * magnitude);
return shifted / magnitude;
}代码示例来源：origin: PhilJay/MPAndroidChart
/**
* Returns the appropriate number of decimals to be used for the provided
* number.
*
* @param number
* @return
*/
public static int getDecimals(float number) {
float i = roundToNextSignificant(number);
if (Float.isInfinite(i))
return 0;
return (int) Math.ceil(-Math.log10(i)) + 2;
}代码示例来源：origin: prestodb/presto
@SuppressWarnings("NonReproducibleMathCall")
private static int decodeNanos(int nanos)
{
if (nanos < 0) {
// This means there is a second VInt present that specifies additional bits of the timestamp.
// The reversed nanoseconds value is still encoded in this VInt.
nanos = -nanos - 1;
}
int nanosDigits = (int) Math.floor(Math.log10(nanos)) + 1;
// Reverse the nanos digits (base 10)
int temp = 0;
while (nanos != 0) {
temp *= 10;
temp += nanos % 10;
nanos /= 10;
}
nanos = temp;
if (nanosDigits < 9) {
nanos *= Math.pow(10, 9 - nanosDigits);
}
return nanos;
}代码示例来源：origin: knowm/XChange
private static int numberOfDecimals(BigDecimal value) {
double d = value.doubleValue();
return -(int) Math.round(Math.log10(d));
}代码示例来源：origin: apache/incubator-druid
@Override
protected ExprEval eval(double param)
{
return ExprEval.of(Math.log10(param));
}
}代码示例来源：origin: jMonkeyEngine/jmonkeyengine
public static int getMinorVersion(String version, String prefix) {
String s = version.substring(prefix.length());
int major = Integer.parseInt(s);
s = s.substring((int) (Math.log10(major) + 2));
return Integer.parseInt(s);
}代码示例来源：origin: jMonkeyEngine/jmonkeyengine
public static int getMinorVersion(String version, String prefix) {
String s = version.substring(prefix.length());
int major = Integer.parseInt(s);
s = s.substring((int) (Math.log10(major) + 2));
return Integer.parseInt(s);
}代码示例来源：origin: prestodb/presto
private static long maxPrecision(int numBytes)
{
return Math.round(Math.floor(Math.log10(Math.pow(2, 8 * numBytes - 1) - 1)));
}代码示例来源：origin: JetBrains/ideavim
private String lineNumberToString(int lineNumber, @NotNull Editor editor) {
final int lineCount = editor.getDocument().getLineCount();
final int digitsCount = (int)Math.ceil(Math.log10(lineCount));
return StringHelper.leftJustify("" + lineNumber, digitsCount, ' ');
}代码示例来源：origin: h2oai/h2o-2
protected int pformat_len0( double scale, int lg ) {
double dx = Math.log10(scale);
int x = (int)dx;
if( x >= 0 && PrettyPrint.pow10i(x) != scale ) throw H2O.unimpl();
int w=1/*blank/sign*/+lg/*compression limits digits*/+1/*dot*/+1/*e*/+1/*neg exp*/+2/*digits of exp*/;
return w;
}代码示例来源：origin: neo4j/neo4j
public static DoubleValue log10( AnyValue in )
{
if ( in instanceof NumberValue )
{
return doubleValue( Math.log10( ((NumberValue) in).doubleValue() ) );
}
else
{
throw needsNumbers( "log10()" );
}
}代码示例来源：origin: prestodb/presto
@Description("logarithm to base 10")
@ScalarFunction
@SqlType(StandardTypes.DOUBLE)
public static double log10(@SqlType(StandardTypes.DOUBLE) double num)
{
return Math.log10(num);
}代码示例来源：origin: apache/hive
/**
* Returns the logarithm of "a" with base 10.
*/
@Override
protected DoubleWritable doEvaluate(DoubleWritable a) {
if (a.get() <= 0.0) {
return null;
} else {
result.set(Math.log10(a.get()));
return result;
}
}代码示例来源：origin: prestodb/presto
@Test
public void testLog10()
{
for (double doubleValue : DOUBLE_VALUES) {
assertFunction("log10(" + doubleValue + ")", DOUBLE, Math.log10(doubleValue));
}
assertFunction("log10(NULL)", DOUBLE, null);
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