Hi all,
I'm having trouble using the roundto function. In particular, I don't
understand the following results:
$ ledger eval '(roundto($0.31 / 2, 2))'
$0.16
$ ledger eval '(roundto($0.31 / 2, 2) == $0.16) ? "equal" : "not equal"'
not equal
$ ledger eval '(roundto($0.31 / 2, 2) - $0.16)'
0
$ ledger eval '(roundto($0.31 / 2, 2) - $0.16 == 0) ? "equal" : "not equal"'
not equal
$ ledger eval '(roundto($0.31 / 2, 2) - $0.16 == $0.00) ? "equal" : "not
equal"'
not equal
I tried adding --unround, but it didn't help. Can someone shed light on this?
This comes up in the following context. I have a ledger file like this:
------------------------------------------------------------------------
2018-01-01 * Purchase
Merchant $0.31
B (roundto(-$0.31 / 2, 2))
A1 -$0.08
A2
eval print("A1: " + account("A1").total)
eval print("A2: " + account("A2").total)
check (account("A1").total == account("A2").total)
------------------------------------------------------------------------
Running ledger -f test1.ledger produces this:
$ ledger -f expenses.ledger --unround bal
A1: $-0.08
A2: $-0.08
Warning: "test.ledger", line 9: Check failed: (account("A1").total ==
account("A2").total)
$-0.08 A1
$-0.08 A2
$-0.15 B
$0.31 Merchant
--------------------
0
I don't understand why the check fails, as it says right there in the log that
the totals of both A1 and A2 are $-0.08.
To try to make sense of this, I modified the file, adding -0.08 explicitly on
the A2 line:
------------------------------------------------------------------------
2018-01-01 * Purchase
Merchant $0.31
B (roundto(-$0.31 / 2, 2))
A1 -$0.08
A2 -$0.08
eval print("A1: " + account("A1").total)
eval print("A2: " + account("A2").total)
check (account("A1").total == account("A2").total)
------------------------------------------------------------------------
Now the check passes, and the output is the same except for one tiny
difference: the last (total) line says $0.00 instead of 0.
A1: $-0.08
A2: $-0.08
$-0.08 A1
$-0.08 A2
$-0.15 B
$0.31 Merchant
--------------------
$0.00
I get very similar results with different numbers:
------------------------------------------------------------------------
2018-01-01 * Purchase
Merchant $0.67
B (roundto(-$0.67 / 2, 2))
A1 -$0.17
A2
eval print("A1: " + account("A1").total)
eval print("A2: " + account("A2").total)
check (account("A1").total == account("A2").total)
------------------------------------------------------------------------
…but here if I add the A2 amount explicitly (-$0.17) the total shows up as
$-0.00 in the balance sheet:
A1: $-0.17
A2: $-0.17
$-0.17 A1
$-0.17 A2
$-0.33 B
$0.67 Merchant
--------------------
$-0.00
Can someone help me make sense of this? Thanks!
Clément.
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