Dreadnaught,
Interesting situation. Let me see if I understand...
You have columns with BOTH positive AND negative numbers,
and you need to be able to identify the LOWEST of the POSITIVE numbers ? And I expect that you preferably do NOT want to modify the existing data ? And you want to be able to do this for EACH of the 180 columns ?
My recommendation would be to utilize the "database" capability of Excel, wherein you would have VBA code (attached to a button) which would extract all the POSITIVE numbers from one column (one column at a time), and these numbers would be extracted to a SEPARATE sheet, where you would have a "resident" normal formula (using the MIN function).
This formula would be positioned at the TOP of the separate "extraction" sheet, and would automatically provide the LOWEST POSITIVE number from those (positive) numbers extracted to this "extraction" sheet.
If you decide that this "course of action" is appropriate, let me know, and I will follow-up with VBA code which you can use for the extraction. I could also send you an example file. Or, better yet, you could FIRST send me a (SMALLER) example of your existing file, and I could then add on the required VBA code and return it to you.
Regards, ...Dale Watson dwatson@bsi.gov.mb.ca