'>groupnames</span>(<span class='no'>x</span>) <span class='kw'>&lt;-</span> <span class='no'>value</span>

<span class='co'># S4 method for ZGroupCurvesDataFrame</span>
<span class='fu'>groupnames</span>(<span class='no'>x</span>)

<span class='co'># S4 method for Zresults</span>
<span class='fu'>groupnames</span>(<span class='no'>x</span>)

<span class='co'># S4 method for Zvariant</span>
<span class='fu'>groupnames</span>(<span class='no'>x</span>)

<span class='co'># S4 method for Zvariant,character</sp