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Math Documentation (#1982)
* Adding math docs * Add some comments to calculate * Remove redudant message Message already shows up in subcommands list * Added not working example Accidentantly * Remove table
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Arash Outadi
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# average
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Calculate the average of values in a column.
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## Examples
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To get the average of the file sizes in a directory, simply pipe the size column from the ls command to the average command.
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```shell
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> ls | get size | average
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━━━━━━━━━
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<value>
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━━━━━━━━━
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2282.727272727273
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━━━━━━━━━
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```
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```shell
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> pwd | split-row / | size | get chars | average
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━━━━━━━━━
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<value>
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━━━━━━━━━
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5.250000000000000
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━━━━━━━━━
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```
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Note that average 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.
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One way to solve this is to convert each row to an integer when possible and then pipe the result to `average`
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```shell
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> open tests/fixtures/formats/caco3_plastics.csv | get tariff_item | average
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error: Unrecognized type in stream: Primitive(String("2509000000"))
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- shell:1:0
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1 | open tests/fixtures/formats/caco3_plastics.csv | get tariff_item | average
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| ^^^^ source
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```
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```shell
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> open tests/fixtures/formats/caco3_plastics.csv | get tariff_item | str --to-int | average
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━━━━━━━━━━━━━━━━━━━
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<value>
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───────────────────
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3239404444.000000
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━━━━━━━━━━━━━━━━━━━
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```
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108
docs/commands/math.md
Normal file
108
docs/commands/math.md
Normal file
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# math
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Mathematical functions that generally only operate on a list of numbers (integers, decimals, bytes) and tables.
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Currently the following functions are implemented:
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`math average` Get the average of a list of number
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`math min` Get the minimum of a list of numbers
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`math max` Get the maximum of a list of numbers
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However, the mathematical functions like `min` and `max` are more permissive and also work on `Dates`.
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## Examples
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To get the average of the file sizes in a directory, simply pipe the size column from the ls command to the average command.
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### List of Numbers (Integers, Decimals, Bytes)
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```shell
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> ls
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# │ name │ type │ size │ modified
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────┼────────────────────┼──────┼──────────┼─────────────
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0 │ CODE_OF_CONDUCT.md │ File │ 3.4 KB │ 4 days ago
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1 │ CONTRIBUTING.md │ File │ 1.3 KB │ 4 days ago
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2 │ Cargo.lock │ File │ 106.3 KB │ 6 mins ago
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3 │ Cargo.toml │ File │ 4.6 KB │ 3 days ago
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4 │ LICENSE │ File │ 1.1 KB │ 4 days ago
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5 │ Makefile.toml │ File │ 449 B │ 4 days ago
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6 │ README.md │ File │ 16.0 KB │ 6 mins ago
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7 │ TODO.md │ File │ 0 B │ 6 mins ago
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8 │ assets │ Dir │ 128 B │ 4 days ago
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9 │ build.rs │ File │ 78 B │ 4 days ago
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10 │ crates │ Dir │ 672 B │ 3 days ago
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11 │ debian │ Dir │ 352 B │ 4 days ago
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12 │ docker │ Dir │ 288 B │ 4 days ago
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13 │ docs │ Dir │ 160 B │ 4 days ago
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14 │ features.toml │ File │ 632 B │ 4 days ago
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15 │ images │ Dir │ 160 B │ 4 days ago
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16 │ justfile │ File │ 234 B │ 3 days ago
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17 │ rustfmt.toml │ File │ 16 B │ 4 days ago
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18 │ src │ Dir │ 128 B │ 4 days ago
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19 │ target │ Dir │ 192 B │ 8 hours ago
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20 │ tests │ Dir │ 192 B │ 4 days ago
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> ls | get size | math average
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───┬────────
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0 │ 6.5 KB
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───┴────────
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> ls | get size | math min
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───┬─────
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0 │ 0 B
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───┴─────
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> ls | get size | math max
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───┬──────────
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0 │ 106.3 KB
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───┴──────────
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# Dates
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> ls | get modified | math min
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2020-06-09 17:25:51.798743222 UTC
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> ls | get modified | math max
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2020-06-14 05:49:59.637449186 UT
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```
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### Operations on tables
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```shell
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> pwd | split row / | size
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───┬───────┬───────┬───────┬────────────
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# │ lines │ words │ chars │ max length
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───┼───────┼───────┼───────┼────────────
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0 │ 0 │ 1 │ 5 │ 5
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1 │ 0 │ 1 │ 7 │ 7
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2 │ 0 │ 1 │ 9 │ 9
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3 │ 0 │ 1 │ 7 │ 7
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───┴───────┴───────┴───────┴────────────
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> pwd | split row / | size | math max
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───────────┬───
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lines │ 0
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words │ 1
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chars │ 9
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max length │ 9
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────────────┴───
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> pwd | split row / | size | math average
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────────────┬────────
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lines │ 0.0000
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words │ 1.0000
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chars │ 7.0000
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max length │ 7.0000
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────────────┴────────
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```
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## Errors
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`math` functions are aggregation functions so empty lists are invalid
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```shell
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> echo [] | math average
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error: Error: Unexpected: Cannot perform aggregate math operation on empty data
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```
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Note `math` functions only work on list of numbers (integers, decimals, bytes) and tables of numbers, if any other types are piped into the function
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then unexpected results can occur.
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```shell
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> echo [1 2 a ] | math average
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0
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```
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