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| ID | Category | Severity | Reproducibility | Date Submitted | Last Update | |||||||
| 0007099 | [Squeak] Kernel | feature | N/A | 06-17-08 22:01 | 06-23-08 20:10 | |||||||
| Reporter | nicolas cellier | View Status | public | |||||||||
| Assigned To | ||||||||||||
| Priority | normal | Resolution | open | |||||||||
| Status | new | Product Version | 3.10 | |||||||||
| Summary | 0007099: [FEATURE] Integer>>sqrtTruncated and sqrtRounded | |||||||||||
| Description |
It can be done in Integer arithmetic and implementation is fast. And it won't suffer any potential inexact arithmetic problem raised by Float conversion... That's why i prefer (x sqrtTruncated) to (x sqrt truncated)... |
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| Additional Information | TODO: implement for rationals... | |||||||||||
| Attached Files |
 Integer-sqrtTruncated-M7099.1.cs [^] (1,918 bytes) 06-17-08 23:13 Integer-sqrtTruncated-Test-M7099.1.cs [^] (2,138 bytes) 06-17-08 23:14 Integer-sqrtTruncated-Test-M7099.2.cs [^] (1,640 bytes) 06-17-08 23:17 Fraction-sqrtTruncated-M7099.1.cs [^] (2,239 bytes) 06-18-08 00:44 Fraction-sqrtTruncated-Test-M7099.1.cs [^] (1,258 bytes) 06-18-08 00:44 |
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Notes |
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(0012300 - 213 - 231 - 231 - 231 - 231 - 231) nicolas cellier 06-17-08 23:18 |
Wrong changeset handling... Integer-sqrtTruncated-Test-M7099.1.cs incorrectly includes/duplicates some methods from Integer-sqrtTruncated-M7099.1.cs That's why there is a Integer-sqrtTruncated-Test-M7099.2.cs |
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(0012301 - 185 - 197 - 197 - 197 - 197 - 197) nicolas cellier 06-17-08 23:24 |
When i think of it, raising a FloatingPointException in an integer arithmetic method is not the nicest thing to do! This exception should better be renamed as an ArithmeticException. |
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(0012302 - 247 - 307 - 307 - 307 - 307 - 307) nicolas cellier 06-18-08 00:24 edited on: 06-18-08 00:45 |
A good example of intermediate inexact arithmetic failure: | x | x := (1 bitShift: 53). self assert: (x + (1/2)) squared sqrtRounded = (x+1) fails if implemented asFloat sqrt rounded I provide hereafter a first Fraction implementation |
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(0012307 - 490 - 682 - 1082 - 1082 - 1082 - 1082) nicolas cellier 06-23-08 20:10 |
Andres Valloud who initiated my answer at http://groups.google.am/group/comp.lang.smalltalk/browse_thread/thread/179b982ac8562ccf [^] has posted on his blog a simular solution (See http://blogten.blogspot.com/2008/06/update-on-sqrtrounded.html) [^] : sqrtRounded | x | x := (self * 4) sqrtTruncated. ^(x//2) + (x\\2) which can also be written (may be more efficiently) sqrtRounded | x | x := (self bitShift: 2) sqrtTruncated. ^(x bitShift: -1) + (x bitAnd: 1) |
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Issue History |
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| Date Modified | Username | Field | Change |
| 06-17-08 22:01 | nicolas cellier | New Issue | |
| 06-17-08 23:13 | nicolas cellier | File Added: Integer-sqrtTruncated-M7099.1.cs | |
| 06-17-08 23:14 | nicolas cellier | File Added: Integer-sqrtTruncated-Test-M7099.1.cs | |
| 06-17-08 23:17 | nicolas cellier | File Added: Integer-sqrtTruncated-Test-M7099.2.cs | |
| 06-17-08 23:18 | nicolas cellier | Note Added: 0012300 | |
| 06-17-08 23:24 | nicolas cellier | Note Added: 0012301 | |
| 06-18-08 00:24 | nicolas cellier | Note Added: 0012302 | |
| 06-18-08 00:44 | nicolas cellier | File Added: Fraction-sqrtTruncated-M7099.1.cs | |
| 06-18-08 00:44 | nicolas cellier | File Added: Fraction-sqrtTruncated-Test-M7099.1.cs | |
| 06-18-08 00:45 | nicolas cellier | Note Edited: 0012302 | |
| 06-23-08 20:10 | nicolas cellier | Note Added: 0012307 | |
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