View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000165 | ascend | compiler | public | 2005-12-13 08:17 | 2012-08-10 09:56 |
| Reporter | john | ||||
| Assigned To | ben | ||||
| Priority | immediate | Severity | block | Reproducibility | always |
| Status | assigned | Resolution | open | ||
| Product Version | |||||
| Target Version | 1.0 | Fixed in Version | |||
| Summary | 0000165: Wrong value in expr pdd_y1[i] = + 4 * alpha[i]^2; | ||||
| Description | This is a serious bug in the expression parser or evaluation engine. In the current (revision 132) file models/johnpye/iapws95.a4c, I have this expression: phirdeltadelta_r3[range_r3] IS_A factor; FOR i IN range_r3 CREATE phirdeltadelta_r3[i] = n[i]* tau^t[i] * exp( r3_b1[i] ) * ( - 2 * alpha[i] * delta^d[i] + 4 * alpha[i]^2 * delta^d[i] * d1^2 (* d1 = d-1 = d-eps *) - 4 * d[i] * alpha[i] * delta^(d[i]-1) * d1 + d[i] * (d[i]-1) * delta^(d[i]-2) ); END FOR; I found that the '+4 *alpha[i]^2' is giving a very large incorrect result. I had to change the value to '+4*alpha[i]*alpha[i]' for it to evaluate correctly. | ||||
| Tags | No tags attached. | ||||
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See changeset 140 for the working (workaround) version. |
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Added models/johnpye/iapws95-failing165.a4c (changeset 156) which demonstrates this bug. |
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Reminder sent to: ben Hi Ben Here is another bug we should probably review. Have you been able to reproduce this one yet? Cheers JP |
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Is this still happening? is this the simplest form of the term that produces the error, or is there a smaller test equation? can you give an example of the incorrect result and correct result (numbers)? does the problem change if relation simplification is turned on/off? |
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updated test model for 165; bug not reproducible on tk gui. (changeset 4306) |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2005-12-13 08:17 | john | New Issue | |
| 2005-12-13 08:18 | john | Note Added: 0000084 | |
| 2005-12-13 08:18 | john | Description Updated | |
| 2005-12-13 17:05 | john | Status | new => assigned |
| 2005-12-13 17:05 | john | Assigned To | => ben |
| 2005-12-20 09:09 | john | Note Added: 0000112 | |
| 2006-02-07 13:19 | john | Target release | => 1.0 |
| 2006-02-07 13:24 | john | Target release | 1.0 => 0.9.6 |
| 2006-05-17 01:04 | john | Note Added: 0000343 | |
| 2010-03-23 18:26 | john | Target Version | => 0.9.8 |
| 2011-03-09 19:32 | john | Target Version | 0.9.8 => 1.0 |
| 2012-08-10 09:05 | ben | Note Added: 0000894 | |
| 2012-08-10 09:56 | ben | Note Added: 0000895 | |
| 2012-08-16 13:01 | john | Note Edited: 0000895 | View Revisions |
