SAS's &SYSINFO macro variable encodes the result of PROC COMPARE as a
bitmask. ks_sysinfo() returns a compatible-style integer summarizing
the same kinds of facts, plus a named integer vector showing which bits
are set. Bit positions follow SAS documentation:
Value
An integer with class ks_sysinfo. Use as.integer() for the
raw value or print to see the named bits.
Details
| Bit | Mask | Meaning |
| 1 | 1 | Data set labels differ |
| 2 | 2 | Data set types differ |
| 3 | 4 | Variable has different informat |
| 4 | 8 | Variable has different format |
| 5 | 16 | Variable has different length |
| 6 | 32 | Variable has different label |
| 7 | 64 | Base data set has observation not in compare |
| 8 | 128 | Compare data set has observation not in base |
| 9 | 256 | Base data set has BY group not in compare |
| 10 | 512 | Compare data set has BY group not in base |
| 11 | 1024 | Base data set has variable not in compare |
| 12 | 2048 | Compare data set has variable not in base |
| 13 | 4096 | A value comparison was unequal |
| 14 | 8192 | Conflicting variable types |
| 15 | 16384 | BY variables do not match |
| 16 | 32768 | Fatal error - comparison not done |
Length and informat are not currently tracked; their bits are always
clear. haven does not surface SAS informats, and column "length"
is not a meaningful R-side concept for numerics.
Examples
a <- data.frame(id = 1:3, x = c(1, 2, 3))
b <- data.frame(id = 1:3, x = c(1, 2, 4), z = 1:3)
cmp <- ks_compare(a, b, by = "id")
#> ⚠ a vs b — 1 value diff across 1 column
ks_sysinfo(cmp)
#>
#> ── SYSINFO = 6144 ──
#>
#> • compare has variable not in base (2048)
#> • value comparison unequal (4096)
as.integer(ks_sysinfo(cmp))
#> [1] 6144
#> attr(,"bits")
#> data set labels differ data set types differ
#> 0 0
#> variable informat differs variable format differs
#> 0 0
#> variable length differs variable label differs
#> 0 0
#> base has observation not in compare compare has observation not in base
#> 0 0
#> base has BY group not in compare compare has BY group not in base
#> 0 0
#> base has variable not in compare compare has variable not in base
#> 0 2048
#> value comparison unequal conflicting variable types
#> 4096 0
#> BY variables do not match fatal error
#> 0 0