persistent variable simulink codegen stateflow error: "IR Construction failed"

8 次查看（过去 30 天）

显示更早的评论

John Hatrick 2019-5-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/460789-persistent-variable-simulink-codegen-stateflow-error-ir-construction-failed

回答： Fangjun Jiang 2019-5-8

在 MATLAB Online 中打开

Greetings,

I'd like to include a function similar to the following in my codegen-compiled simulink model:

function u = PD_control( x )
    persistent x_last_iter            % save last x each iter
    if isempty(x_last_iter)
        x_last_iter = x;              % 1st iter -> set to 1st x
    end
    
    Kp = 1;    Kd = 1;                % PD control params
    u = -x*Kp + (x_last_iter - x)*Kd  % calculate control input
end

However, I get compiler error below. "IR Construction failed" returns zero hits when I search the web.

I can avoid this error by setting the initial value to 0 instead: "x_last_iter = 0;" But this is not ideal.

Anyone understand this error? I feel I am correctly following the documentation here: Persistent Variables and Persistent Array Variables

Respectfully, John

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Fangjun Jiang 2019-5-8

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/460789-persistent-variable-simulink-codegen-stateflow-error-ir-construction-failed#answer_374158

I think IR means "Internal Representation". It might be a bug. Make a simple example and submit a service request to the Mathworks.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

类别

Code Generation Simulink Coder

在 Help Center 和 File Exchange 中查找有关 Simulink Coder 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!

Translated by