> For the complete documentation index, see [llms.txt](https://docs.geopard.tech/geopard-tutorials/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.geopard.tech/geopard-tutorials/nl/api-documentatie/overzicht-van-geopard-api-verzoeken/74.-mutatie-equation-verifieren.md).

# 74. Mutatie: "Equation" verifiëren

Mutatie om de Equation-code te verifiëren. De Equation-engine is gebouwd bovenop `python` taal met ondersteuning voor gebruikelijke wiskundige bewerkingen. 

De lijst met ondersteunde bewerkingen:

1. Python basismodule: abs, all, any, bin, bool, bytearray, bytes, chr, complex, dict, dir, divmod, enumerate, filter, float, format, frozenset, hash, hex, id, int, isinstance, len, list, map, max, min, oct, ord, pow, range, repr, reversed, round, set, slice, sorted, str, sum, tuple, type, zip.
2. Python math-module: acos, acosh, asin, asinh, atan, atan2, atanh, ceil, copysign, cos, cosh, degrees, e, exp, fabs, factorial, floor, fmod, frexp, fsum, hypot, isinf, isnan, ldexp, log, log10, log1p, modf, pi, pow, radians, sin, sinh, sqrt, tan, tanh, trunc.
3. Python voorwaarden: if, elif, else.
4. Python lussen: for, while.

{% hint style="danger" %}
`equationAsText` moet worden omgeven door """\<equation>""" en de code moet in python-stijl zijn.&#x20;

Houd alleen de noodzakelijke inspringing en spatiëring aan.
{% endhint %}

{% code overflow="wrap" lineNumbers="true" %}

```graphql
mutation VerifyEquation {
  verifyEquation(input: {
    dataVariables: [{
      variabele: "yield_vol"
      sampleValue: 1.1 
    }, {
      variabele: "prod"
      sampleValue: 2.2
    }]
    equationAsText: """calculated = yield_vol/prod + 3.5 
if calculated >= 30:
    result = 35
elif calculated >= 20 and calculated < 30:
    result = 25
else:
    result = 15
    """
    equationResultVariable: "result"
  }) {
    executed
    result
    errorMessage
  }
}
```

{% endcode %}


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