How do I avoid hardcoding output size when using simulink coder.extrinsic?

9 次查看（过去 30 天）
Josiah Wai
Josiah Wai 2023-5-1
评论： Josiah Wai 2023-5-6
I have a matlab function 'control_fun' that I'm using in a simulink model. It does not compile with codegen so I'm using coder.extrinsic to run the model. The problem is that I have to hardcode the size of the output of controlfun when I would like this to be parameter that can change (not during a simulation, but between simulations). I use a simulink matlab-function to call the control_fun.
This works:
function u = call_control_fun(data, parameter) % parameter = 5
coder.extrinsic('control_fun')
u = zeros(5,1);
u = control_fun(data)
But this doesn't:
function u = call_control_fun(data, parameter) % parameter = 5
coder.extrinsic('control_fun')
u = zeros(parameter, 1);
u = control_fun(data)
This results in an error:
Block ''call_controlfun'' does not fully set the dimensions of output 'u'.
I have tried playing with coder.varsize but haven't gotten anything to work.
  1 个评论
Josiah Wai
Josiah Wai 2023-5-1
update: an okay-ish workaround is to use a large fixed output size with zero-padding, then elsewhere in the model use variables to index into u and remove the zero-padding.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Fangjun Jiang
Fangjun Jiang 2023-5-5
编辑：Fangjun Jiang 2023-5-5
I suspect that the "parameter" in your code is not really a parameter-by-definition by the MATLAB Function block. It appears as an Inport to the MATLAB Function block, does it?
In MATLAB Function block editor, click "Edit Data", change the "Scope" or "Type" of "parameter" from "Input" to "Parameter". Then, "parameter" won't appear as an Inport to the MATLAB Function block, it becomes a parameter of the block, just like any other parameters of any other Simulink blocks. You set its value in base workspace or model workspace. Then the error you had should disappear.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Event Functions 的更多信息

标签

产品


版本

R2022a

Community Treasure Hunt

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

Start Hunting!

Translated by