# CSV abs integer column

`csv-abs-integer-column` · version 1.0.0 · CSV & tables · free, no key needed

Replace every data cell in a named CSV column with the absolute value of a canonical integer.

**Use when you need to: csv abs integer column · absolute value csv integer column · csv column absolute value.**

## Supported

- csv abs integer column
- absolute value csv integer column
- csv column absolute value

## Not supported

- floating point abs
- complex modulus
- unicode digit normalization
- read files
- fetch urls

## Behavior

- The first CSV record is the header row. Duplicate and empty header names are rejected.
- column names an existing header exactly; no trimming, case folding, or fuzzy matching.
- Every data cell in column is a canonical integer string parsed with BigInt. Empty cells and non-integers are invalid. -0 is accepted and canonicalized to 0.
- Each output cell is the canonical integer string of the absolute value. The result is never negative.
- An empty document without a header is rejected. A header-only document is returned unchanged.
- Other columns and row order are preserved. The first output header name may not begin with U+FEFF.

## Input

- `csv` (string, required): max length 256000
- `column` (string, required): min length 1; max length 256

## Output

- `csv` (string, required)

## Limits

- max input bytes: 256000
- max data rows: 5000
- max columns: 256
- max header name bytes: 256
- max integer digits: 1000
- max output bytes: 256000

## Example

Request input:

```json
{
  "csv": "n,label\n-5,a\n0,b\n12,c\n-0,d\n",
  "column": "n"
}
```

Response:

```json
{
  "result": {
    "csv": "n,label\n5,a\n0,b\n12,c\n0,d\n"
  }
}
```

## How to call it

### MCP

Connect `https://computefirst.net/mcp` ([setup](/docs#connect)), then call `execute` with:

```json
{
  "id": "csv-abs-integer-column",
  "version": "1.0.0",
  "input": {
    "csv": "n,label\n-5,a\n0,b\n12,c\n-0,d\n",
    "column": "n"
  }
}
```

### HTTP (no key)

```sh
curl -X POST https://computefirst.net/v1/tools/csv-abs-integer-column/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"csv":"n,label\n-5,a\n0,b\n12,c\n-0,d\n","column":"n"}'
```

The machine-readable contract is at [/v1/tools/csv-abs-integer-column/versions/1.0.0](/v1/tools/csv-abs-integer-column/versions/1.0.0).

### CLI

```sh
node cli.mjs run csv-abs-integer-column 1.0.0 --input input.json --base-url https://computefirst.net
```

Get the client at [/clients/cli/](/clients/cli/).

## Related tools

- [CSV clamp integer column](/tools/csv-clamp-integer-column): Clamp every data cell in a named CSV column to optional canonical integer min and max bounds.
- [CSV filter equals](/tools/csv-filter-equals): Keep CSV data rows whose named column equals an exact string.
- [CSV scale integer column](/tools/csv-scale-integer-column): Multiply every data cell in a named CSV column by a canonical integer factor.
- [CSV sum integers](/tools/csv-sum-integers): Sum a CSV column of strict signed base-10 integer strings using BigInt.
- [CSV distinct values](/tools/csv-distinct-values): List distinct exact values of one CSV column in first-seen order.
- [CSV min max integers](/tools/csv-min-max-integers): Minimum and maximum of a CSV column of strict signed base-10 integer strings.