{ # 如果在assay中的基因长度为0,则报错 if (length(x = value[['TRUE']]) == 0) { stop( "None of the features provided are in this Assay object", call. = FALSE ) # 如果在assay中的基因长度大于0,则警告: 不在assay中的基因为... } else { warning( "Not all features provided are ...