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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

  • "slow on the uptake" is correct English ;->

    I knew what you meant by "transcribe" - just not exactly how you'd done the transcription. I hope it wasn't a for loop, because that's not a good way of dealing with a list. It would have been OK if you'd done newList=foreach(mapcar item oldList item) or better still newList=copy(oldList) - but even then, I don't see how it would have fixed the problem!

    Regards,

    Andrew.

Reply

  • "slow on the uptake" is correct English ;->

    I knew what you meant by "transcribe" - just not exactly how you'd done the transcription. I hope it wasn't a for loop, because that's not a good way of dealing with a list. It would have been OK if you'd done newList=foreach(mapcar item oldList item) or better still newList=copy(oldList) - but even then, I don't see how it would have fixed the problem!

    Regards,

    Andrew.

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