 , here
, here rv is empty  
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#include <libFN.h>
| Public Member Functions | |
| vec | eval (const vec &cond) | 
| inherited | |
| constfn (const vec &val0) | |
| Default constructor. | |
| virtual void | condition (const vec &val) | 
| function substitutes given value into an appropriate position | |
| int | dimension () const | 
| access function | |
| Protected Attributes | |
| int | dimy | 
| Length of the output vector. | |
 , here
, here rv is empty  1.5.8
 1.5.8