How to set up multithreading on repetitive programs

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I am running a program which involves iterating through images and building a large matrix of results. There are no interactions or races between each iteration -- just simple brute force calculation on a different set of images. Since my computer has 8 cores, I'd like to divide up the task into 8 chunks and have them all go at the same time. I've actually done this manually by opening up 8 instances of matlab, loading the same dataset 8 times into RAM, and just changing the start and ending indexes of the program in each instance, and it worked great, reducing run time to nearly 1/8th. Of course this is silly -- is there some way to do this same process but on one instance of matlab with one dataset loaded into RAM but 8 processes?