MATLAB-apm-url problem

[Birsen]

Hi,

I am using MATLAB with apm (APMonitor) to find the parameters of an equation but I got an error :

"Error using urlread

The value of 'url' is invalid. Expected input to be one of these types:

char

Instead its type was java.net.URL."

Does anyone knows how to fix this?

Thank you in advance

here is the code:

% Add APMonitor toolbox available from

% http://apmonitor.com/wiki/index.php/Main/MATLAB

addpath('apm')

% server and application

s = 'http://byu.apmonitor.com';

a = 'regression';

% clear any prior application

apm(s,a,'clear all');

% load model and data files

apm_load(s,a,'model.apm');

csv_load(s,a,'data.csv');

% configure parameters to estimate

apm_info(s,a,'FV','a');

apm_info(s,a,'FV','b');

apm_info(s,a,'FV','c');

apm_option(s,a,'a.status',1);

apm_option(s,a,'b.status',1);

apm_option(s,a,'c.status',1);

apm_option(s,a,'nlc.imode',2);

% solve nonlinear regression

output = apm(s,a,'solve');

disp(output)

[John Hedengren]

Birsen,

Please check that your MATLAB version is 2014+ and that you are
connected to the Internet. If either of those is a problem, I
recommend that you try Python Gekko that doesn't require an internet
connection in local mode. There is also a way to call Gekko from
Matlab: https://apmonitor.com/che263/index.php/Main/MatlabCallsPython

Best regards,
John Hedengren

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--
Best regards,

John Hedengren
GEKKO Optimization Suite
https://machinelearning.byu.edu

[Bircan]

Hi John,

Thank you for your response. I am using MATLAB 2022a and I have no internet issues. Someone in MATLAB group mentioned that the path might be a problem. The apm  folder is in the same folder where my MATLAB script is. I still have not resolved yet.

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--

Birsen