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From: tommy2k nogger on 26 May 2010 15:13
hi guys,

i have been working with simulink for a few weeks now and i still try to understand a few things. i hope someone of you can help me with there "basic" questions:

at first a general question concerning the solvers:
i know the difference between the fixed step and the variable step solver, the fixed steps are fixed and the variable ones can be variable depending on the dynamic of the system ;) this is clear so far... but tell me how do the discrete and/or continous "option" affect these solvers?

another question concerning the solvers (maybe it has something to do with that before): if i build e.g. an PWM-generator, its input signal is discrete, but its output signal is continous. how can the output signal "interfere" the input signal? e.g. can that cause problems with the sample time?!

probably this question is connected with the second one ;) if i use the "repeating sequence stair" as a counter, with a higher frequency it goes down without reaching the peak (it leaves the last numbers, always different ones). if i have a higher sample rate it becomes better, if the number it has to count is not even the problem is still the same... can this be called antialiasing?

ok guys, u see, even I dont know how to categorize these questions correctly, i know these are problems but describing them (without knowing the cause correctly) makes it even harder...

i hope some of you have an idea, let me thank everybody in advance for ur help!
simon
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