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<!DOCTYPE HTML>
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<h2 title="Interface DoubleParser" class="title">Interface DoubleParser</h2>
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<pre>public interface <span class="typeNameLabel">DoubleParser</span></pre>
<div class="block">A fast double parser inspired from https://github.com/wrandelshofer/FastDoubleParser</div>
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<td class="colFirst"><code>static class </code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="DoubleParser.UInt128.html" title="class in org.apache.sysds.utils">DoubleParser.UInt128</a></span></code></th>
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<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DOUBLE_EXPONENT_BIAS">DOUBLE_EXPONENT_BIAS</a></span></code></th>
<td class="colLast"> </td>
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<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DOUBLE_MAX_EXPONENT_POWER_OF_TEN">DOUBLE_MAX_EXPONENT_POWER_OF_TEN</a></span></code></th>
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<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DOUBLE_MAX_EXPONENT_POWER_OF_TWO">DOUBLE_MAX_EXPONENT_POWER_OF_TWO</a></span></code></th>
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<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DOUBLE_MIN_EXPONENT_POWER_OF_TEN">DOUBLE_MIN_EXPONENT_POWER_OF_TEN</a></span></code></th>
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<td class="colFirst"><code>static double[]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DOUBLE_POWERS_OF_TEN">DOUBLE_POWERS_OF_TEN</a></span></code></th>
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<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DOUBLE_SIGNIFICAND_WIDTH">DOUBLE_SIGNIFICAND_WIDTH</a></span></code></th>
<td class="colLast"> </td>
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<td class="colFirst"><code>static <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#ILLEGAL_OFFSET_OR_ILLEGAL_LENGTH">ILLEGAL_OFFSET_OR_ILLEGAL_LENGTH</a></span></code></th>
<td class="colLast"> </td>
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<td class="colFirst"><code>static long[]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#MANTISSA_64">MANTISSA_64</a></span></code></th>
<td class="colLast">
<div class="block">When mapping numbers from decimal to binary, we go from w * 10^q to m * 2^p, but we have 10^q = 5^q * 2^q, so
effectively we are trying to match w * 2^q * 5^q to m * 2^p.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#MAX_EXPONENT_NUMBER">MAX_EXPONENT_NUMBER</a></span></code></th>
<td class="colLast"> </td>
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<tr class="rowColor">
<td class="colFirst"><code>static long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#MINIMAL_NINETEEN_DIGIT_INTEGER">MINIMAL_NINETEEN_DIGIT_INTEGER</a></span></code></th>
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<td class="colFirst"><code>static <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#SYNTAX_ERROR">SYNTAX_ERROR</a></span></code></th>
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<td class="colFirst"><code>static double</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#parseFloatingPointLiteral(java.lang.String,int,int)">parseFloatingPointLiteral</a></span>​(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> str,
int offset,
int endIndex)</code></th>
<td class="colLast"> </td>
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<td class="colFirst"><code>static long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#unsignedMultiplyHigh(long,long)">unsignedMultiplyHigh</a></span>​(long x,
long y)</code></th>
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<h4>MAX_EXPONENT_NUMBER</h4>
<pre>static final int MAX_EXPONENT_NUMBER</pre>
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<dd><a href="../../../../constant-values.html#org.apache.sysds.utils.DoubleParser.MAX_EXPONENT_NUMBER">Constant Field Values</a></dd>
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<pre>static final <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> ILLEGAL_OFFSET_OR_ILLEGAL_LENGTH</pre>
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<pre>static final <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> SYNTAX_ERROR</pre>
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<pre>static final long MINIMAL_NINETEEN_DIGIT_INTEGER</pre>
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<dd><a href="../../../../constant-values.html#org.apache.sysds.utils.DoubleParser.MINIMAL_NINETEEN_DIGIT_INTEGER">Constant Field Values</a></dd>
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<pre>static final int DOUBLE_MIN_EXPONENT_POWER_OF_TEN</pre>
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<pre>static final int DOUBLE_MAX_EXPONENT_POWER_OF_TEN</pre>
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<pre>static final int DOUBLE_SIGNIFICAND_WIDTH</pre>
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<dd><a href="../../../../constant-values.html#org.apache.sysds.utils.DoubleParser.DOUBLE_SIGNIFICAND_WIDTH">Constant Field Values</a></dd>
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<pre>static final double[] DOUBLE_POWERS_OF_TEN</pre>
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<pre>static final int DOUBLE_MAX_EXPONENT_POWER_OF_TWO</pre>
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<dd><a href="../../../../constant-values.html#org.apache.sysds.utils.DoubleParser.DOUBLE_MAX_EXPONENT_POWER_OF_TWO">Constant Field Values</a></dd>
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<h4>DOUBLE_EXPONENT_BIAS</h4>
<pre>static final int DOUBLE_EXPONENT_BIAS</pre>
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<dd><a href="../../../../constant-values.html#org.apache.sysds.utils.DoubleParser.DOUBLE_EXPONENT_BIAS">Constant Field Values</a></dd>
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<h4>MANTISSA_64</h4>
<pre>static final long[] MANTISSA_64</pre>
<div class="block">When mapping numbers from decimal to binary, we go from w * 10^q to m * 2^p, but we have 10^q = 5^q * 2^q, so
effectively we are trying to match w * 2^q * 5^q to m * 2^p.
<p>
Thus, the powers of two are not a concern since they can be represented exactly using the binary notation, only
the powers of five affect the binary significand.
<p>
The mantissas of powers of ten from -308 to 308, extended out to sixty-four bits. The array contains the powers of
ten approximated as a 64-bit mantissa. It goes from 10^<a href="#DOUBLE_MIN_EXPONENT_POWER_OF_TEN">-325</a> to
10^<a href="#DOUBLE_MAX_EXPONENT_POWER_OF_TEN">308</a> (inclusively). The mantissa is truncated, and never rounded up. Uses
about 5 KB.
<pre>
long getMantissaHigh(int q) {
MANTISSA_64[q - SMALLEST_POWER_OF_TEN];
}
</pre></div>
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<h4>parseFloatingPointLiteral</h4>
<pre class="methodSignature">static double parseFloatingPointLiteral​(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> str,
int offset,
int endIndex)</pre>
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<h4>unsignedMultiplyHigh</h4>
<pre class="methodSignature">static long unsignedMultiplyHigh​(long x,
long y)</pre>
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