olumns</a> </li><li> <a href="tech.v3.dataset.html#var-replace-missing">replace-missing</a> </li><li> <a href="tech.v3.dataset.html#var-replace-missing-value">replace-missing-value</a> </li><li> <a href="tech.v3.dataset.html#var-reverse-rows">reverse-rows</a> </li><li> <a href="tech.v3.dataset.html#var-row-at">row-at</a> </li><li> <a href="tech.v3.dataset.html#var-row-count">row-count</a> </li><li> <a href="tech.v3.dataset.html#var-row-map">row-map</a> </li><li> <a href="tech.v3.dataset.html#var-row-mapcat"