Integer & fractional parts

paulmasson · Jan 19, 2021 · 742bb86 · 742bb86
1 parent 1058477
commit 742bb86
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diff --git a/build/math.js b/build/math.js
@@ -2988,6 +2988,16 @@ function sign( x ) {
 
 }
 
+function integerPart( x ) {
+
+  if ( isComplex(x) ) return complex( Math.trunc(x.re), Math.trunc(x.im) );
+
+  return Math.trunc(x);
+
+}
+
+function fractionalPart( x ) { return sub( x, integerPart(x) ); }
+
 
 function kronecker( i, j ) {
 

diff --git a/docs/functions.html b/docs/functions.html
@@ -343,6 +343,10 @@ <h1>Miscellaneous Functions</h1>
 
 <p><b>sign( <i>x</i> )</b> &mdash; signum function of a real or complex number</p>
 
+<p><b>integerPart( <i>x</i> )</b> &mdash; integer part of a real or complex number</p>
+
+<p><b>fractionalPart( <i>x</i> )</b> &mdash; fractional part of a real or complex number</p>
+
 <p><b>kronecker( <i>i</i>, <i>j</i> )</b> &mdash; Kronecker delta &delta;<sub><i>ij</i></sub> for real or complex arguments</p>
 
 <p><b>kronecker( <i>i</i>, <i>j</i>, <i>k</i>, &hellip; )</b> &mdash; Kronecker delta &delta;<sub><i>ijk&hellip;</i></sub> for an arbitrary number of real or complex arguments</p>

diff --git a/src/functions/miscellaneous.js b/src/functions/miscellaneous.js
@@ -51,6 +51,16 @@ function sign( x ) {
 
 }
 
+function integerPart( x ) {
+
+  if ( isComplex(x) ) return complex( Math.trunc(x.re), Math.trunc(x.im) );
+
+  return Math.trunc(x);
+
+}
+
+function fractionalPart( x ) { return sub( x, integerPart(x) ); }
+
 
 function kronecker( i, j ) {