how to save variable value neatly

Hi, I am trying to save variables in matlab and I find that matlab always save all the files related to this this variables. For example, a=b*3. Then I save a. But when I load a, b appears in the workplace too. It is annoying when there are loads of b. Is anyone how to deal with the situation that I only want to store the value of a?

Answer 1

[Image Analyst]

What was your code? If you do

save(fullMatFileName, 'a');

Then is will only save a and no other variables. What did you do? To retrieve

storedStructure = load(fullMatFileName); % Get everything that was stored.
a = storedStructure.a; % Retrieve a.

[xueqi]

Yes by doing this

if true
  % save(fullMatFileName, 'a');

end

it does only save the variable a. But a is existing in the file named as fullMatFileName. I guess it is a variable must be existing in a mat file instead of being existing independently as a mat file. Is that right?