I am trying to find the root mean square error(RMSE) but i am getting this error when I tried to find the output in command window 'Unrecognized function or variable 'Hot_Output'.

function [OBJ] = Main_Combined_optimization(Opt_Param)

%% code Description: Main optimization Function

%%Run Model with optimization Parameters

global hot;

Data = xlsread('hotspot.csv');

hot.RecordingTime = Data(:,1);

hot.Loading = Data(:,2);

hot.HotToTopOilGradient = Data(:,3);

t = hot.RecordingTime;

K = hot.Loading;

Hot_Output = hot.HotToTopOilGradient;

%% call the optimizer

[HotSpotTemperture_Optimization] = Combined_Optimization(K,Opt_Param,t);

error_HT = Hot_Output - HotSpotTemperture_Optimization;

OBJ_HT = sum( trapz(t, error_HT.^2));

OBJ = OBJ_HT;

%% Calculate the RMSE

RMSE = sqrt( sum((Hot_Output(:)- HotSpotTemperture_Optimization(:)).^2) / numel(Hot_Output) );

end

Answer 1

[Just Manuel]

That's a question of variable scope. Variables declared in a function are only visible within the function that declared it.

If you want to use that data after execution of the function, make it an output variable. If you just want to have a look at it for debugging, set a breakpoint in your function (go at this line: [HotSpotTemperture_Optimization] = Combined_Optimization(K,Opt_Param,t); where Hot_Temperature is already assigned.), then you will see all the variables in the workspace window.

Cheers

Manuel

[dahlak hagos]

I have tried it but it is not working. I am not sure how to make it an output variable as well.

[Just Manuel]

What exactly have you tried?

See the doc's if you need instructions on how to debug:

https://ch.mathworks.com/help/matlab/matlab_prog/debugging-process-and-features.html

When I set a breakpoint at that line, I can see all the variables created within the function, including Hot_Output.

To make it an output variable, change your function signature to

function [OBJ, Hot_Output] = Main_Combined_optimization(Opt_Param)

then you can call your function with

[obj, hot_output] = Main_Combined_optimization(Opt_Param);

then you get obj and hot_output in your workspace and you can also view them by typing them in the command window.

Cheers

Manuel

[dahlak hagos]

Thank you, it works now.

[Just Manuel]

You're welcome.

[Just Manuel]

Dear @dahlak hagos

One more thing: please accept the answer :)

Cheers

Manuel