Editing .mat file in matlab

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Ivan Tadiwanashe Chuma
评论： Image Analyst 2023-3-26
I am struggling to edit the ActionInfo in DQN_agent_Sell_Trained.mat file. I have tried to use the examples at Access and change variables in MAT-file without loading file into memory - MATLAB (mathworks.com) but was not successful. I have tried
ActionInfo_Sell=some filetype
DQN_agent_Sell_Trained = matfile('DQN_agent_Sell_Trained.mat','Writable',true);
DQN_agent_Sell_Trained.ActionInfo=ActionInfo_Sell;
However, when I run the code, a new ActionInfo variable is added instead of overwriting the ActionInfo with ActionInfo_Sell. Any clue on how to solve my problem? I have attached the file. Or to make my question simple, how do I replace or edit ActionInfo variable within the DQN_agent_Sell_Trained.mat file?

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回答（1 个）

Image Analyst
Image Analyst 2023-3-25
Why do you not want to read it into memory? Why not simply do
% Load mat file into a structure.
s = load('DQN_agent_Sell_Trained.mat');
% Get one of the variables that we want to alter.
DQN_agent_Sell_Trained = s.DQN_agent_Sell_Trained
% Then modify DQN_agent_Sell_Trained somehow.
% Then save it back out:
save('DQN_agent_Sell_Trained.mat', 'DQN_agent_Sell_Trained', '-append');
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Ivan Tadiwanashe Chuma
Ivan Tadiwanashe Chuma 2023-3-26
Lets say I want to set ActionInfo = 1, how do I do it? I have tried
s = load('DQN_agent_Sell_Trained.mat');
DQN_agent_Sell_Trained = s.DQN_agent_Sell_Trained
DQN_agent_Sell_Trained.ActionInfo = 1 %Just an example
But I am getting the notification error that the file is read-only. Kindly assist.
Image Analyst
Image Analyst 2023-3-26
If the file is readonly and you want to change it, you should use the operating system to remove the readonly property from the file.

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