Non-constant expression or empty matrix .This expression must be constant because its value determines the size or class of some expression

3 次查看（过去 30 天）

Jeevan Kulal 2022-2-1

编辑： Jeevan Kulal 2022-2-2

function I am going to convert from .m to .c file using matlab coder while doing it so i am getting error in

this line of below shown code i.e fieldName = char(theFields(match))% case-sensitive field name

code :

Walter Roberson 2022-2-1

theParam = model.(fieldName);

That struct potentially have a different type for each field, so the type of theParam is not fixed, and so cannot be compiled for.

If you were to initialize theParam to a fixed size and type then possibly you could get further.

Walter Roberson 2022-2-1

Yes, that might work, possibly.

Jeevan Kulal 2022-2-1

编辑：Jeevan Kulal 2022-2-2

function theParam = getParamESC(paramName,temp,model)

theParam = zeros(1,1,"double");

.....further code

i have initialized as shown above, but still getting the same error.

MATLAB Language Fundamentals Data Types Data Type Conversion

在 Help Center 和 File Exchange 中查找有关 Data Type Conversion 的更多信息

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

Translated by