Matlab (Embedded) Function Block sample time

2 次查看（过去 30 天）
Emmanuel
Emmanuel 2013-5-2
评论： Abid Rahman Kodakkadan 2016-2-24
Hey
I have a model that uses a variable step solver (ODE45). How do I ensure that the Matlab function blocks in my model are executed only once during each sample time, i.e. at the same sample time as the rest of my model considering that the sample time can vary with a variable step solver.
I know it is quite easy to do this with a fixed step solver. However my model requires a very small sample time (<0.01) to run with a fixed step solver (such as ODE4) to avoid singularities. Due to complexity of the matlab function block calculations performed, this is very very slow.
Appreciate any thoughts and advice to solve this problem!
Thanks in advance,
Emmanuel

请先登录，再回答此问题。

回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-5-2
That depends on your embedded function inputs, if they came from a block with sample time, then set those sample time to inherited. If you can not, then pass those input through a zoh block with sample time set to inherited
  2 个评论
Emmanuel
Emmanuel 2013-5-2
should I set the sample time of the embedded matlab function blocks to inherited? If I do this then it seems to run multiple times each time step (during some time steps).
This is because I ask it to display some results in the command window and it seems to display the same results multiple times (during some time steps only!)
is there a way to 'tell' the embedded matlab block to 'grab' the current sample time from the rest of the simulation?
Abid Rahman Kodakkadan
Abid Rahman Kodakkadan 2016-2-24
Is there any answer on this? I also experience this and the embedded function is taking in absurd values that a scope in simulink cannot detect. I also guess this is because the function executes multiple times during one simulation step.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Naming Conventions 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by