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can't reorganizing a list

bloodwayn

 hi,

what could be the reason that the functions "reverse" and "sortcar" do not work?!

my list normally consist of other list elements which include parameters you can see in the two following codelines. 

pos = list(field_count xButtomLeft yButtomLeft xUpperRight yUpperRight)
l_pos = cons(pos l_pos)

the field_count is an integer starting at 0. the other values are coordinates of a rectangle.
these function is called multiple times. so at the end l_pos can looks like:

l_pos = ((4 7657.6 4641.6 8657.6 5527.0) (3 7657.6 3641.6 8657.6 4641.6) (2 7657.6 2641.6 8657.6 3641.6) (1 7657.6 1641.6 8657.6 2641.6))

now i need the list in inverse form. i try it with

a) reverse(l_pos) ... nothing has change

b) sortcar( l_pos ' lessp) ... the result is l_pos = ((4 7657.6 4641.6 8657.6 5527.0))

but if i transcribe the list into another like l_bla and apply the functions on the new list....it works.
i have no idea why it happens

regards,
philip

 

Parents

  • hi andrew,

    very thanks and ... i was slow on the uptake(is this right in english^^). sure...l_pos = reverse(l_pos) .... i don't know why i missed out the "l_pos="  =)

    so thanks for that really good description and it answered my question.

    transcribe i thought was the englisch meaning to write data from one poin to another?! ... like from one list to another list.
    and i realize this with a simple for loop

    regards,
    philip

Reply

  • hi andrew,

    very thanks and ... i was slow on the uptake(is this right in english^^). sure...l_pos = reverse(l_pos) .... i don't know why i missed out the "l_pos="  =)

    so thanks for that really good description and it answered my question.

    transcribe i thought was the englisch meaning to write data from one poin to another?! ... like from one list to another list.
    and i realize this with a simple for loop

    regards,
    philip

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