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Some bugs calling composite functions with if() or cases()
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Joined: 28/08/2014(UTC) Posts: 613  Was thanked: 337 time(s) in 216 post(s)
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Hi. I don't know if this is a know one. I guess they are related to the fact that functions with if can neither be derived nor integrated. Notice that seems that there are a bug in cases() too.  FunctionBug.sm (14kb) downloaded 7 time(s). FunctionBug.pdf (49kb) downloaded 7 time(s).Best regards. Alvaro.
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Rank: Advanced Member Groups: Registered
Joined: 28/08/2014(UTC) Posts: 613 Was thanked: 337 time(s) in 216 post(s)
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... and issues in composite functions with loops. FunctionBug2.sm (18kb) downloaded 5 time(s). FunctionBug2.pdf (77kb) downloaded 5 time(s).Best regards. Alvaro.
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1 user thanked Razonar for this useful post.
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Rank: Advanced Member Groups: Registered
Joined: 28/08/2014(UTC) Posts: 613 Was thanked: 337 time(s) in 216 post(s)
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Originally Posted by: Razonar  ... and issues in composite functions with loops. FunctionBug2.sm (18kb) downloaded 5 time(s). FunctionBug2.pdf (77kb) downloaded 5 time(s).Best regards. Alvaro. Debugging with trace(), what I see is that when calling g, f takes phi=1, (this is the first phi=1 in the output window) but don't do the loop. Calling f isolated shows another phi=1 and subsequent values for phi.  With for(3) gives an error, so I can't debug that. Additionally, calling with for(4) seems to have the same behavior than while. 
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Joined: 04/07/2015(UTC) Posts: 5,060  Was thanked: 809 time(s) in 642 post(s)
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Originally Posted by: Razonar I don't know if this is a know one. I guess they are related to the fact that functions with if can neither be derived nor integrated. Notice that seems that there are a bug in cases() too. 1. You must assign "cases" like in your last example. 2. Before Davide introduced "cases" it was a damned job integrate unless from discrete finite differences like in the old days. The min(x) style [undocumented] is quite smart, mostly OK Simpson. Cheers ... Jean Integrate Discontinuous [min(x)].sm (17kb) downloaded 8 time(s).
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 Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,321   Location: Italy Was thanked: 1167 time(s) in 768 post(s)
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As I've already mentioned here and there, assignments shouldn't be made inside cases() arguments, because: Originally Posted by: Davide Carpi Please be careful however, since a symbolic evaluation to show the function content or a failed evaluation with an error triggered on the conditions leads to the evalution of all the options.
In general currently is better to use cases to host just dead content (numbers, strings, variables). This is a downside that currently can't be prevented. As you can see making the assignment outside cases() works as expected. |
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Some bugs calling composite functions with if() or cases()
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