Question

我的数据框String serverURL = "http://192.168.0.150/main_light/switch"; URL url = new URL(serverURL); HttpURLConnection connection = null; try { connection = (HttpURLConnection) url.openConnection(); connection.setRequestMethod("GET"); BufferedReader in = new BufferedReader( new InputStreamReader(con.getInputStream())); //Do something with this InputStream // handle the response int status = connection.getResponseCode(); // If response is not success if (status != 200) { throw new IOException("Post failed with error code " + status); } } catch (Exception e) { Log.e(TAG,e.toString()); } finally { if(connection != null) connection.disconnect(); }中有一列Season，其格式为NBAS

我希望将此值更改为日期时间值，以便此子集可用：

"1989-90"

编辑3：编辑上方以显示更多上下文

现在它正在给我错误信息：

summary(lm(X3PA ~ W.L., data = subset(NBAS, NBAS$Season > '1989-90')))

谢谢！

EDIT1：根据NicE的建议，我只是删除了连字符并使用以下格式将格式更改为数字：

Error in lm.fit(x, y, offset = offset, singular.ok = singular.ok, ...) : 
  0 (non-NA) cases
In addition: Warning message:
In Ops.factor(NBAS$Season, "1989-90") : ‘>’ not meaningful for factors

然后我能够正确使用该子集。

Answer 1

您可以尝试删除连字符并将其视为数字：

NBAS$Season <- as.numeric(gsub("-","",Season))

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