SAS IML传递对宏中定义的变量的引用 [英] SAS IML pass reference to variable defined in macro

问题描述

在SAS/IML中，我尝试将对宏中定义的变量的引用传递给用户定义的模块.模块更改变量值. 由于该函数的调用在do循环中，因此我不能使用& -sign .但是， symget 的使用不起作用.这是我的代码.

In SAS/IML I try to pass to a user defined module a reference to a variable that is defined in macro. The module changes the variable value. Since call of the function is in the do-loop I cannot use &-sign. However use of symget does not work. Here is my code.

proc iml;
    start funcReference(argOut);

        print "funcReference " argOut;
        argOut = 5;

    finish funcReference;
    store module=funcReference;
quit;

proc IML;
    mydata1 = {1 2 3};
    call symput ('macVar', 'mydata1');

    load module=funcReference;
    run funcReference(symget('macVar'));

    print mydata1;
quit;

输出显示变量 mydata1 尚未更改:

The output shows that variable mydata1 have not changed:

argOut 
funcReference mydata1 

mydata1 
1 2 3 

有什么想法吗?

已解决

非常感谢！

推荐答案

您正在发送临时标量矩阵(SYMGET调用的结果).如文章哦，那些讨厌的临时变量！"

You are sending in a temporary scalar matrix (the result of the SYMGET call). That temporary variable is being updated and promptly vanishes, as explained in the article "Oh, those pesky temporary variables!"

应该使用VALUE和VALSET函数代替宏变量(即文本字符串)，如文章您需要发送一个实矩阵以正确更新值，如下所示:

Instead of macro variables (which are text strings), you should use the VALUE and VALSET functions, as described in the article "Indirect assignment: How to create and use matrices named x1, x2,..., xn" You need to send in a real matrix in order for the values to be updated correctly, as follows:

proc IML;
load module=funcReference;
mydata1 = {1 2 3};
call symput('macVar', 'mydata1');

matrixName = symget('macVar');  /* matrix named &mydata1 */
z = value(matrixName);          /* z contains data */
run funcReference(z);           /* update values in z */
call valset(matrixName, z);     /* update data in &mydata1 */

print mydata1;

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