Excel Formulas and File Size Limitations with Numbers

I am trying to use Numbers with a number of Excel files I have developed over the years. After opening several Excel files I find the size of the sheets are truncated [esp. the number of cells in width] and some KEY FORMULAS are not supported – esp. XIRR to calculate Internal Rate of Return.
Am I missing something or is Numbers a much more limited app than I had imagined?
I can install Excel on my new iMac, but since Numbers came with the new confuser I thought I'd try it.

I wasn't aware about the differences in the IRR function between Numbers and Excel. The subset of functions in Numbers 3 should be almost identical to their Excel equivalents. Are you sure?
From Numbers help:
IRR(flows-range, estimate)
flows-range: A collection that contains the cash flow values. flows-range must contain number values. Income (a cash inflow) is specified as a positive number, and an expenditure (a cash outflow) is specified as a negative number.
From Excel Microsoft support:
Returns the internal rate of return for a series of cash flows represented by the numbers in values. These cash flows do not have to be even, as they would be for an annuity. However, the cash flows must occur at regular intervals, such as monthly or annually. The internal rate of return is the interest rate received for an investment consisting of payments (negative values) and income (positive values) that occur at regular periods.
I'm pretty sure the sign convention is identical, as these two descriptions suggest.
In any case, if you need XIRR and/or you work with large datasets with lots of columns, then you need Excel.
SG

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Excel Formulas and File Size Limitations with Numbers

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