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Minor stddev updates (#2452)

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1. Add an example for getting the sample stddev
2. Opt for ? instead of generic Err match
This commit is contained in:
Chris Gillespie 2020-08-29 20:36:43 -07:00 committed by GitHub
parent 634bb688c1
commit 84a6010f71
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1 changed files with 21 additions and 19 deletions
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40
crates/nu-cli/src/commands/math/stddev.rs
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@ -83,30 +83,32 @@ impl WholeStreamCommand for SubCommand {
entries: column_totals,
})
.into_untagged_value())
};
}?;
match res {
Ok(v) => {
if v.value.is_table() {
Ok(OutputStream::from(
v.table_entries()
.map(|v| ReturnSuccess::value(v.clone()))
.collect::<Vec<_>>(),
))
} else {
Ok(OutputStream::one(ReturnSuccess::value(v)))
}
}
Err(e) => Err(e),
if res.value.is_table() {
Ok(OutputStream::from(
res.table_entries()
.map(|v| ReturnSuccess::value(v.clone()))
.collect::<Vec<_>>(),
))
} else {
Ok(OutputStream::one(ReturnSuccess::value(res)))
}
}
fn examples(&self) -> Vec<Example> {
vec![Example {
description: "Get the stddev of a list of numbers",
example: "echo [1 2 3 4 5] | math stddev",
result: Some(vec![UntaggedValue::decimal(BigDecimal::from_str("1.414213562373095048801688724209698078569671875376948073176679737990732478462107038850387534327641573").expect("Could not convert to decimal from string")).into()]),
}]
vec![
Example {
description: "Get the stddev of a list of numbers",
example: "echo [1 2 3 4 5] | math stddev",
result: Some(vec![UntaggedValue::decimal(BigDecimal::from_str("1.414213562373095048801688724209698078569671875376948073176679737990732478462107038850387534327641573").expect("Could not convert to decimal from string")).into()]),
},
Example {
description: "Get the sample stddev of a list of numbers",
example: "echo [1 2 3 4 5] | math stddev -s",
result: Some(vec![UntaggedValue::decimal(BigDecimal::from_str("1.581138830084189665999446772216359266859777569662608413428752426396297219319619110672124054189650148").expect("Could not convert to decimal from string")).into()]),
},
]
}
}