I can't find helper function: transientBCHeatedBlock which is supposed to be in: matlab/R20​XXx/exampl​es/pde/mai​n

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John McGrath
John McGrath 2024-8-17
编辑： Walter Roberson 2024-9-3
Trying to run example on Matlab site that includes:
model.EdgeBC(6)= ...
edgeBC(Temperature=@transientBCHeatedBlock);
  2 个评论
Steven Lord
Steven Lord 2024-8-17
Can you confirm which release you're using and that you have Partial Differential Equations Toolbox installed? The ver function will include both these pieces of information.
Can you also show us the output of ls executed in that example's directory?
John McGrath
John McGrath 2024-8-17
Hi Steven
Thanks for your response. I am using 2024a. I used ver and confirmed that I installed that toolbox. I don't understand your last question. Sorry
When try to run the code that I copied from the Matlab examples website I get the following in the Command Widow:
Undefined function 'solve' for input arguments of type 'struct'.
Error in untitled36 (line 28)
r= solve(model, tlist);
I think the problem is that I need to locate the help function that I was asking about and copy it into my code. I see the helper function as a subroutine that will be referenced when called on.

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回答（1 个）

Walter Roberson
Walter Roberson 2024-8-17
Ran in:
The first thing you need to do is go through Preferences -> Help and install help locally.
Once that is done, look for
try
ls(fullfile(matlabshared.supportpkg.getSupportPackageRoot, 'examples', 'pde', 'main', 'transientBCHeatedBlock.m'))
catch ME
disp('not under support package root')
end
not under support package root
try
ls(fullfile(fileparts(docroot), 'examples', 'pde', 'main', 'transientBCHeatedBlock.m'))
catch ME
disp('not under docroot')
end
not under docroot
If it is not under either place then there is trouble.
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John McGrath
John McGrath 2024-9-3
Hi Walter
Many thanks for your help. I apologize for being such a novice. I understood yoru answer ot mean that I could find the files of interest if I entered what you sent me into teh Command WIndow and ran it. When I did I got this repsonse:
ans = '/SupportPackages/examples/pde/main/NoBoundaryConditionsBetweenSubdomainsExample.mlx'
I don't know what to do.
john
Walter Roberson
Walter Roberson 2024-9-3
编辑：Walter Roberson 2024-9-3
Ran in:
Now
ls(fullfile(matlabshared.supportpkg.getSupportPackageRoot, 'examples', 'pde', 'main', 'NoBoundaryConditionsBetweenSubdomainsExample.mlx'))
Error using ls (line 47)
ls: cannot access '/SupportPackages/examples/pde/main/NoBoundaryConditionsBetweenSubdomainsExample.mlx': No such file or directory
to see if the file actually exists.
It is extremely unlikely that you happen to be using Linux and installed the files in /SupportPackages .
It is more likely that you are experimenting with using MATLAB Online. It is questionable whether MATLAB Online has the examples installed.
... I just checked using the Linux find utility. I confirm that MATLAB Online does not have the pde examples installed.

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