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39 lines
1.2 KiB
Markdown
Vendored
39 lines
1.2 KiB
Markdown
Vendored
---
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title: eval
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description: This page provides information about the 'eval' function for creating
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custom data columns using mathematical expressions supported by pandas.eval(). It
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exemplifies case sensitivity and the use of queries on loaded datasets.
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keywords:
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- eval function
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- custom data column
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- pandas.eval
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- mathematical expressions
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- datasets
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- case sensitive
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- query
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- DGS2
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- DGS5
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---
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import HeadTitle from '@site/src/components/General/HeadTitle.tsx';
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<HeadTitle title="economy /eval - Reference | OpenBB Terminal Docs" />
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Create custom data column from loaded datasets. Can be mathematical expressions supported by pandas.eval() function. Example. If I have loaded `fred DGS2,DGS5` and I want to create a new column that is the difference between these two, I can create a new column by doing `eval spread = DGS2 - DGS5`. Notice that the command is case sensitive, i.e., `DGS2` is not the same as `dgs2`.
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### Usage
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```python
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eval [-q QUERY [QUERY ...]]
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```
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---
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## Parameters
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| Name | Description | Default | Optional | Choices |
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| ---- | ----------- | ------- | -------- | ------- |
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| query | Query to evaluate on loaded datasets | None | False | None |
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---
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