I am doing a large scale computation problem, and I have several variables, which is large scale (>100MB). I was told that MATLAB will not automatically remove the not used memory in running, is that right?
If so, can I put into the code that "clear -var" to remove it, so that speedup the program? Is there some one who has done this before? What is the effect then?
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There are some situations in which removing unused large variables could speed up calculations a lot, but if the variables are just sitting in memory without being touched then probably it is not significantly affecting the speed of your calculations.
What hammers speed the most in MATLAB tends to be failing to pre-allocate arrays to reasonable sizes, and then to increase the size of the array on (most or every) iteration.