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Iterative references in LibreOffice Calc
An as yet unanswered Q from Stack Overflow [SO] enquired:
how to stop looping this formula
where the formulae were:
in B9 =16,50
in B10 =B9-B11
in B11 =B10/2
without changing text in cell.
(The above after changing * to / based on a comment. It can also be deduced from that comment that 16,5 is a value ("sixteen and a half") and that the formulae should return 11 in B10 and 5,5 or 5.5 in B11.)
The effect is to split the B9 value into 2/3rds (B10) and1/3rd (B11) but this was an academic exercise with the artificial constraint that:
My lecturer want to 3 option... He didn't let me to change formulas in cell, he want explanation error and "magic solve".
So, how to achieve the desired split without changing the formulae?
1 answer
Since the formulae have circular references (Err:522) the spreadsheet setting needs to be changed to enable iteration (Tools > Options… > LibreOffice Calc > Calculation, tick Iterations and choose a sensible combination of Steps: and Minimum change:, OK). For current purposes I suggest 100 for Steps; and 0.01 for Minimum change:.
The iteration is the looping required and Steps: and Minimum change: limit the number of iterations.
The user's difficulty might have been because of the formula error (multiply should have been divide) since, as mentioned by SO user @tohuwawohu:
it won't work for factors >=1 multiplied with B10. I can't tell why
I don't know why either, but do remember a bug.
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