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Minor Math Sum Additions (#2007)

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* Move sum tests into math directory

* Move sum documentation over to math documentation

One sum example already existed in the math examples and a few of the others were outdated and didn't work, so I only moved one over, and updated their output

* Remove no-longer-in-use mod statement
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Joseph T. Lyons 2020-06-19 14:00:18 -04:00 committed by GitHub
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commit bc9cc75c8a
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4 changed files with 7 additions and 45 deletions
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0
crates/nu-cli/tests/commands/sum.rs → crates/nu-cli/tests/commands/math/sum.rs
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1
crates/nu-cli/tests/commands/mod.rs
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@ -44,7 +44,6 @@ mod split_by;
mod split_column;
mod split_row;
mod str_;
mod sum;
mod touch;
mod trim;
mod uniq;

7
docs/commands/math.md
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@ -117,6 +117,13 @@ To get the average of the file sizes in a directory, simply pipe the size column
────────────┴────────
```
To get the sum of the characters that make up your present working directory.
```shell
> pwd | split row / | size | get chars | math sum
50
```
## Errors
`math` functions are aggregation functions so empty lists are invalid

44
docs/commands/sum.md
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@ -1,44 +0,0 @@
# sum
This command allows you to calculate the sum of values in a column.
## Examples
To get the sum of the file sizes in a directory, simply pipe the size column from the ls command to the sum command.
```shell
> ls | get size | math sum
━━━━━━━━━
value
━━━━━━━━━
51.0 MB
━━━━━━━━━
```
To get the sum of the characters that make up your present working directory.
```shell
> pwd | split-row / | size | get chars | math sum
━━━━━━━━━
<value>
━━━━━━━━━
21
━━━━━━━━━
```
Note that sum only works for integer and byte values. If the shell doesn't recognize the values in a column as one of those types, it will return an error.
One way to solve this is to convert each row to an integer when possible and then pipe the result to `sum`
```shell
> open tests/fixtures/formats/caco3_plastics.csv | get tariff_item | math sum
error: Unrecognized type in stream: Primitive(String("2509000000"))
- shell:1:0
1 | open tests/fixtures/formats/caco3_plastics.csv | get tariff_item | math sum
| ^^^^ source
```
```shell
> open tests/fixtures/formats/caco3_plastics.csv | get tariff_item | str --to-int | math sum
━━━━━━━━━━━━━
<value>
─────────────
29154639996
━━━━━━━━━━━━━
```