# Compute, fixes, variables

This section documents accessing or modifying data stored by computes,
fixes, or variables in LAMMPS using the following functions:

-   `lammps_extract_compute`{.interpreted-text role="cpp:func"}
-   `lammps_extract_fix`{.interpreted-text role="cpp:func"}
-   `lammps_extract_variable_datatype`{.interpreted-text
    role="cpp:func"}
-   `lammps_extract_variable`{.interpreted-text role="cpp:func"}
-   `lammps_set_variable`{.interpreted-text role="cpp:func"}

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::: {.doxygenfunction project="progguide"}
lammps_extract_compute
:::

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::: {.doxygenfunction project="progguide"}
lammps_extract_fix
:::

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::: {.doxygenfunction project="progguide"}
lammps_extract_variable_datatype
:::

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::: {.doxygenfunction project="progguide"}
lammps_extract_variable
:::

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::: {.doxygenfunction project="progguide"}
lammps_set_variable
:::

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::: doxygenenum
\_LMP_DATATYPE_CONST
:::

::: doxygenenum
\_LMP_STYLE_CONST
:::

::: doxygenenum
\_LMP_TYPE_CONST
:::

::: doxygenenum
\_LMP_VAR_CONST
:::