Dieter Kaiser wrote:
> Am Donnerstag, den 11.06.2009, 19:17 -0400 schrieb Raymond Toy:
>
>> Dieter Kaiser wrote:
>>
>>> Am Donnerstag, den 11.06.2009, 18:36 -0400 schrieb Raymond Toy:
>>>
>>>
>>>> Dieter Kaiser wrote:
>>>>
>>>>
>>>>> I would like to suggest to improve the Maxima user function apropos.
>>>>> This is the last result of some work to get a working function apropos:
>>>>>
>>>>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>>>>>
>>>>> ;;; Utility function to filter a list LST with a function FN
>>>>> ;;; e.g. (filter #'(lambda(x) (if (oddp x) x)) '(1 2 3 4 5 6 7)) --> (1
>>>>> 3 5 7)
>>>>>
>>>>>
>>>>>
>>>> I think this is called remove-if-not. :-)
>>>>
>
> Hello Ray,
>
> at first I have thought that the function filter is identical to
> remove-if-not. But that is not true.
>
Yes, you are correct. I missed the fact that the function can give new
results.
Ray