Difference between revisions of "BitCount"

Revision as of 04:44, 26 January 2016

BitCount(x, which)

Counts the number of 1 bits in the 64-bit integer portion of «x».

The optional «which» parameter can be one of the following text values

'-0' : Trailing (least significant) zero bits.

'-1' : Trailing 1s

'0-' : Leading (most significant) 0s.

'1-' : Leading 1s

Examples

BitCount(0) → 0

BitCount(13) → 3 { note: 13 = 0b1101 }

Negative numbers are in 64-bit two's complement form, so that

BitCount(-1) → 64

BitCount(0b1101010000, which: '-0') → 4

BitCount(0b1101010000, which: '0-') → 54

BitCount(0b1101010000, which: '-1') → 0

BitCount(0b1101011111, which: '-0') → 5

BitCount(-256, which: '1-') → 56

History

Introduced in Analytica 4.7.

@@ Line 1: / Line 1: @@
 [[category:Bit functions]]
-''new to [[Analytica 4.7]]''
 == BitCount(x'', which'') ==
@@ Line 8: / Line 6: @@
 The optional «which» parameter can be one of the following text values
-* '-0' : Trailing (least significant) zero bits.
+:<code>'-0'</code> : Trailing (least significant) zero bits.
-* '-1' : Trailing 1s
+:<code>'-1'</code> : Trailing 1s
-* '0-' : Leading (most significant) 0s.
+:<code>'0-'</code> : Leading (most significant) 0s.
-* '1-' : Leading 1s
+:<code>'1-'</code> : Leading 1s
-= Examples =
+== Examples ==
+:<code>BitCount(0) &rarr; 0</code>
+:<code>BitCount(13) &rarr; 3  { note: 13 = 0b1101 }</code>
-:<code>[[BitCount]](0) &rarr; 0</code>
+Negative numbers are in 64-bit two's complement form, so that
-:<code>[[BitCount]](13) &rarr; 3</code>   { note: 13 = 0b1101 }
+:<code>BitCount(-1) &rarr; 64</code>
-Negative numbers are in 64-bit two's complement form, so that
+:<code>BitCount(0b1101010000, which: '-0') &rarr; 4</code>
-:<code>[[BitCount]](-1) &rarr; 64</code>
+:<code>BitCount(0b1101010000, which: '0-') &rarr; 54</code>
+:<code>BitCount(0b1101010000, which: '-1') &rarr; 0</code>
+:<code>BitCount(0b1101011111, which: '-0') &rarr; 5</code>
+:<code>BitCount(-256, which: '1-') &rarr; 56</code>
-:<code>[[BitCount]]( 0b1101010000, which:'-0')</code> &rarr; 4
+==History==
-:<code>[[BitCount]]( 0b1101010000, which:'0-')</code> &rarr; 54
+Introduced in [[Analytica 4.7]].
-:<code>[[BitCount]]( 0b1101010000, which:'-1')</code> &rarr; 0
-:<code>[[BitCount]]( 0b1101011111, which:'-0')</code> &rarr; 5
-:<code>[[BitCount]]( -256, which:'1-')</code> &rarr; 56
 == See Also ==
 * [[BitAnd]]
 * [[BitOr]]