# Can MATLAB parallel computing be used to speed up an Excel VBA loop which calculates, for each of many model points, a complex calculation formulated in an Excel worksheet?

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dpb
on 25 Jul 2021

Depends on just what it is, obviously. Most of the time in my experience, the multiple cells in Excel are simply it's form of array processing in that one has to duplicate the cell to hold the data or the formula to reference the data and its output that is the content of the cell.

In ML if one starts with the inputs as arrays, then those same output cells are the result of a vectorized calculation in MATLAB.

This obviously isn't always so, but I'd think worthy of thinking about in a perusal of what the spreadsheet actually does.

It could, of course, lead to a nightmare; I've also seen such that were truly incredible edifices that anybody would have thunk to have built...the functionality could have been written from a specification document, but to translate from the Excel spreadsheet implementation instead would be nightmare -- one would instead have to go at from a base design document.

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Jason Ross
on 28 Jul 2021

Overy complex spreadsheets can be nightmares to debug and maintain. At some point if you could get the thing running to call out to Parallel Server, you would end up with adding complexity to an already complex document. Getting the complex formulas out and separating the data from the code would be a huge step forward, but also would require a decent amount of work and verification that the results are correct.

Since this sounds like it's an all Excel/MS/VB setup already, you might be able to benefit from using Microsoft HPC Server. They do have a plug-in for Excel, which allows the computations to be farmed out to a cluster -- but you would still need to do some refactoring.

I have a feeling, though, that the best long term fix is going to be to get the complex logic out of the spreadsheet where it's hard to debug and into a programming language that's easier to understand ... you can still use spreadsheets as inputs and outputs, but things like iteration, cycling through values, and producing output are much easier in a programming language. You can also version control the code and set up regression tests to ensure the model is working like it should be.

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