Question

我有以下代码。我试图测试一个段落（descr）的关键字列表（key_words）。当我执行此代码时，日志会读入数组的所有变量，但只会测试do循环中20,000行中的2行（do i = 1到100和on）。有关如何解决此问题的任何建议？

data JE.KeywordMatchTemp1;
  set JE.JEMasterTemp end=eof;
  if _n_ = 1 then do i = 1 by 1 until (eof);
    set JE.KeyWords;
    array keywords[100] $30 _temporary_;
    keywords[i] = Key_Words;
  end;
  match = 0;
  do i = 1 to 100;
    if index(descr, keywords[i]) then match = 1;
  end;
  drop i;
run;

Answer 1

您的问题是您的end=eof位置错误。

这是计算每个SASHELP.CLASS受访者年龄值“等级”的简单示例。

查看我放置end=eof的位置。那是因为您需要使用它来控制阵列填充操作。否则，你的循环do i = 1 to eof;实际上并没有真正做到你应该说的那样：它实际上并没有终止于eof，因为它永远不会是真的（因为它在< em>第一次 set声明）。相反，它会终止，因为您会超出数据集的末尾，这是您不想要的。

这就是end=eof正在做的事情：当数组填充数据集完成时，它阻止你尝试拉一行，这会终止整个数据步骤。只要您在完成2次迭代后看到数据步骤终止，您就可以确信问题可能是什么 - 这是一个非常常见的问题。

data class_ranks;
  set sashelp.class;   *This dataset you are okay iterating over until the end of the dataset and then quitting the data step, like a normal data step.;
  array ages[19] _temporary_; 
  if _n_=1 then do;
    do _i = 1 by 1 until (eof);   *iterate until the end of the *second* set statement;
      set sashelp.class end=eof;  *see here? This eof is telling this loop when to stop.  It is okay that it is not created until after the loop is.;
      ages[_i] = age;
    end;
    call sortn(of ages[*]);   *ordering the ages loaded by number so they are in proper order for doing the trivial rank task;
  end;
  age_rank = whichn(age,of ages[*]);  *determine where in the list the age falls.  For a real version of this task you would have to check whether this ever happens, and if not you would have to have logic to find the nearest point or whatnot.;
run;

SAS Do Loop在处理中省略了行

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