Title

    [D] recast -- Change storage type of variable


Syntax

        recast type varlist [, force]

    where type is byte, int, long, float, double, str1, str2, ..., str2045, or strL.


Description

    recast changes the storage type of the variables identified in varlist to type.


Options

    force makes recast unsafe by causing the variables to be given the new storage type even if that will cause
        a loss of precision, introduction of missing values, or, for a string variables, the truncation of
        strings.

        force should be used with caution.  force is for those instances where you have a variable saved as a
        double but would now be satisfied to have the variable stored as a float, even though that would lead
        to a slight rounding of its values.


Examples

    Setup
        . sysuse auto

    Describe the variable mpg
        . describe mpg

    Change the storage type of mpg from int to byte
        . recast byte mpg

    Describe the variable mpg
        . describe mpg

    Describe the variable headroom
        . describe headroom

    Try to change the storage type of headroom from float to int
        . recast int headroom

    Describe the variable headroom
        . describe headroom

    Describe the variable make
        . describe make

    Try to change the storage type of make from str18 to str16
        . recast str16 make

    Change the storage type of make from str18 to str20
        . recast str20 make

    Describe the variable make
        . describe make

太感谢了！！手册直接上，已经解决。

请问我将str150 用recast压缩至str100,有100个值改变了，怎么才能知道是哪些值改变了呢(样本很大),谢谢指教