new =的原因。 在您的示例中是因为SAS无法将逗号识别为十进制分隔符。请参阅日志中的注释。

The reason new = . in your example is because SAS does not recognize the comma as a decimal separator. See the note in the log.

注意：函数INPUT的无效参数在第4行第11列。
old = 1， 61个新=。 错误 = 1 N = 1
注意：在以下位置无法执行数学运算。操作的结果已设置为
个缺失值。

NOTE: Invalid argument to function INPUT at line 4 column 11. old=1,61 new=. ERROR=1 N=1 NOTE: Mathematical operations could not be performed at the following places. The results of the operations have been set to missing values.

文档包含各种SAS格式的列表。根据文档，您似乎可以使用 COMMAX 信息。

The documentation contains a list of various SAS informats. Based on the documentation it looks like you can use the COMMAX informat.

COMMAXw.d-写入数值，其句点每三位分隔一个逗号，逗号分隔十进制小数。

COMMAXw.d - Writes numeric values with a period that separates every three digits and a comma that separates the decimal fraction.

修改后的代码如下：

data temp;
    old = '1,61';
    new = input(old,commax5.);
run;

proc print;

结果为：

Obs    old      new

 1     1,61    1.61

如果您希望将 new 变量保留为相同格式，则只需添加语句 format new commax5。; 转到数据步骤。

If you want to keep the new variable in the same format you can just add the statement format new commax5.; to the data step.

感谢汤姆指出SAS在 INPUT（）中使用了信息格式功能。

Thanks to Tom for pointing out that SAS uses informats in the INPUT() function.