Newbie: How can I operate with huge data in variables at the workspace?
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In a test, I have gathered like 200MB of data splited in like 8 variables. I have an array of data for voltage (3000000x1 double) and another for current. I would like to plot the resistance, and I tried in the Command Window:
Resistance= Voltage/Current (as those are the names of the variables)
I get this error:
???Error using==> mldivide Out of memory. Type HELP MEMORY for your options.
This is a very small test compared with another and I really hope it is not because the PC has not RAM to do it!!
Muthu Annamalai on 25 Jun 2013
Edited: Muthu Annamalai on 25 Jun 2013
You probably want to do this instead,
Resistance= Voltage./Current; %don't for semi-colon b/c of your data size!
to obtain the element-wise division. Reading the MATLAB tutorial is an excellent way to get started!
Did you type help memory like it suggested? Or check here: http://www.mathworks.com/support/tech-notes/1100/1107.html. Can you use single variables instead of double? Can you add RAM memory?
Use ./ instead of / to do an element by element division. A single, plain slash means a matrix divide so it has to calculate the inverse. You're essentially doing a least squares regression calculation, which is not what you want to do.
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