[SciPy-user] vectorize bug/feature

Travis Oliphant oliphant at ee.byu.edu
Sat Nov 12 21:20:27 CST 2005

Yaroslav Bulatov wrote:

>Suppose my function f returns 0,  .1, .2 for values 0,1,2.
>When I do ff=vectorize(f); ff([1,2,3]), I get [0,0,0] which is
>counter-intuitive. Apparently it sees that f(0) is a long, so it makes
>the array of longs, and .1,.2 turn into 0.
If you don't declare the output type (using the otypes keyword to 
vectorize), then the code simply uses the first argument to try and 
discern the output type.   You should pass in a fixed output type and 
bypass the guess.


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