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Peter Aronsson
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Mar 30, 2005
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| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> | ||
| <html> | ||
| <head> | ||
| </head> | ||
| <body> | ||
| <h1>Things that does not work</h1> | ||
| OpenModelica v.1.2.1<br> | ||
| <br> | ||
| <h2> In simulation code: <br> | ||
| </h2> | ||
| <ul> | ||
| <li> Event handling, only continuous subset of Modelica works<br> | ||
| </li> | ||
| <li> Limited error checking in numerical solver. <br> | ||
| </li> | ||
| <li> Limited support for initial values. <br> | ||
| </li> | ||
| <li> No dynamic selection of states (in index reduction) <br> | ||
| </li> | ||
| <li>Only possible to run with DASSL numerical solver. <br> | ||
| </li> | ||
| <li>initial equation can not be used. Set initial values using the | ||
| start attribute instead, e.g. Real x(start=1);</li> | ||
| <li>All initial values must be consistent, i.e. no initial value | ||
| calculation is performed. This can be done by hand and filled in into | ||
| the <modelname>_init.txt file.<br> | ||
| </li> | ||
| </ul> | ||
| <h2>In translation to flat Modelica: | ||
| <br> | ||
| </h2> | ||
| <ul> | ||
| <li>Inner/Outer </li> | ||
| <li>Some excotic cases with Modifications, especially with redeclare. | ||
| </li> | ||
| <li>Each modifier</li> | ||
| <li>Final element modification not checked against.</li> | ||
| <li>Constraining type on redeclarations</li> | ||
| <li>Restrictions on redeclarations (subtype etc.)</li> | ||
| <li>Derivatives of functions, using annotations. </li> | ||
| <li>Components of function type not implemented.</li> | ||
| <li>When clauses. </li> | ||
| <li>Restrictions on connections. </li> | ||
| <li>The following operators in 3.4.2 have not been implemented: <br> | ||
| smooth noEvent sample edge change reinit terminate mod delay | ||
| cardinality <br> | ||
| </li> | ||
| <li>Reduction expressions, </li> | ||
| <li>Slice operation. Partly works but the resulting component names | ||
| are sometimes messed up. </li> | ||
| <li>Vectorized call of functions not implemented. </li> | ||
| <li>Output parameters of functions, enable attribute, etc.</li> | ||
| </ul> | ||
| <ul> | ||
| <li>Matrices and vectors in equations (only works if can be fully | ||
| converted to scalar values.)</li> | ||
| <li>Array construction (3.4.4.1). Using array(... for ...) syntax. | ||
| Partially implemented. Left to do: <br> | ||
| - Constant evaluation and/or optimization. Could be implemented as | ||
| function calls with index as argument. Or array can be unrolled and | ||
| indexed, or if constant value can be calculated and indexed. Array | ||
| should then be cached. <br> | ||
| - Automatic type conversion of element type, e.g. (Real[]) a[5] = | ||
| {(Integer)3 for ...} fails. <br> | ||
| - Handle multiple iterators <br> | ||
| </li> | ||
| <li>Array constructors with iterators. Using {expr for i in ...} | ||
| syntax. <br> | ||
| </li> | ||
| <li>Deduction of ranges (3.3.3.1). It is allowed to leave out "in | ||
| range" in loops. e.g. for i loop ... end for; according to | ||
| specification.</li> | ||
| <li>Multiple loop ranges, e.g.: for i in 1:5, j in 1:3 loop | ||
| a[i,j]=i*j; end for; <br> | ||
| </li> | ||
| <li>Constant evaluation of record constructors for hierachical | ||
| records. <br> | ||
| </li> | ||
| <li>Constant evaluation of dot ('.') operator. </li> | ||
| </ul> | ||
| </body> | ||
| </html> |