How to add new rows in an existing .mat file?

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CINDY LASCO
CINDY LASCO 2018-3-10
回答： chiraz Ajmi 2018-11-26
Hello. I am trying to save the texture features that I extracted from an image in a .mat file and set it as my training dataset. I wanted to save each and every texture features that I extracted everytime I process an image to that same .mat file. How can I do it? Or do you have any code that can help me to get it? I read about"append" but it replaces the values with same variables. Please, I appreciate your help on this one.
Best regards!
  2 个评论
Stephen23
Stephen23 2018-3-10
"I read about"append" but it replaces the values with same variables"
Unfortunately the append option is simply very badly named. It would have been better called ensureExists or overwrite.
Abhishek Chakraborty
Abhishek Chakraborty 2018-5-12
I have been facing the same problem. Using the code :
try load db; F=[F c]; db=[db;F]; save db.mat db
catch db=[F c]; save db.mat db
end
Every time I open a new image, the values get overwritten. Please make a correction in this so that new rows are added.

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回答（2 个）

Ahmet Cecen
Ahmet Cecen 2018-3-10
编辑：Ahmet Cecen 2018-3-10
Take a loot at this: MATFILE.
This is actually a function, and you can modify most variables in a matfile like you would in the workspace, without loading them entirely to RAM.
chiraz Ajmi
chiraz Ajmi 2018-11-26
Hello , i am facing the some problem can some one help me i want to save each time the extracted features from the image in a file and set it as the training dataset .

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