Question

我有第一个表“结果”，大小为5313行，第二个表“Lpp_sans_rss”，大小为3889行。我想通过在第一个表的最后一列中的第二个表中仅添加第二列“lpp_libelle”来创建表之间的合并。我的问题是：当我在这两个表之间进行合并时，我得到“124556”行。我希望通过添加每个“lpp_code”的“libell”来保持第一个表的大小相同

表1的例子：

/**
 * Invoke a remote procedure over WS on the specified session, with the given arguments.
 * @param session The target session on which to send the RPC message
 * @param target The name of the procedure to call
 * @param arguments The arguments to be sent in the message
 * @return
 */
public CompletableFuture<Map<String,Object>> invoke(WebSocketSession session, String target, Map<String, Object> arguments){
    Invocation invocationMessage = new Invocation(target, arguments);
    invocationMessage.setId(getNextId());

    // completeable future for the result. It does nothing, will be completed when reply is received which happen in a different thread, see completeInvocation
    CompletableFuture<Map<String, Object>> invocationFuture = new CompletableFuture<>();

    CompletableFuture<Void> senderFuture = sender.sendMessage(session, invocationMessage);

    // handle problem in the sending of the message
    senderFuture.exceptionally(e -> {
        // is this correct ??
        invocationFuture.completeExceptionally(e);
        return null;
    });

    // store the pending invocation in the registry
    registry.addPendingInvocation(new PendingInvocation(invocationMessage, session, invocationFuture));

    // return the future so the caller can have access to the result once it is ready
    return invocationFuture;
}

表2的例子：

code_acte;lpp_code;count;expected_count;p-value;ROR;drug_margin;event_margin;FDR
 NGQK001 ;985675;3;0.00894810101411811;9.99200722162641e-16;689.196078431372;105;6;2.11945533050936e-16
 DASA006 ;985536;3;0.0159787518109252;9.99200722162641e-16;288.012295081967;9;125;2.11778383576921e-16

Answer 1

首先，查找table1中的每个lppcode

查看table2中lpp_libelle对于该lppcode的内容

将该值放在table1的第10列的table1中

for (i in length(table1[,2])){
 table1[i,10]=as.character(table2[which(table2[,1]==table1[i,2]),2])
}

编辑：Ferdi的回答更优雅。

Answer 2

以下问题中描述的左外连接（或简称左连接）应该可以解决您的问题。

merge(x = results, y = Lpp_sans_rss, by = "ENTERHEREYOURCRITERIA", all.x = TRUE)

How to join (merge) data frames (inner, outer, left, right)?

在R中的两个表之间合并

2 个答案: