Re: A89: get a number
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Re: A89: get a number
How can I get the numbers from the data mathematicaly?
I created the equation
y*elementsize*ywith+x*elementsize.
lea map(pc),a1
addi.w #1,d6 ;d6=x
cmp.w #8,d6 ;end of data on line 0
beq next
bra putmap
next:
move.w #1,d6 ;restart
addi.w #1,d7 ;d7=y, start next line
cmp.w #3,d7 ;end of data
beq exit
putmap:
mulu #16,d7 ;this multiplies the element size and
;ywith to y
mulu #2,d6 ;this is the element size times x
add.w d7,d6 ;finishes equation y*2*8+x*2
move.w d6(a1),d0 ;I also tried putting the value in
;d6 to a variable and using move.w var1(a1),d0.
This doesn't work and I don't know why. Could
somebody help me?
--- Olle Hedman <oh@hem.passagen.se> wrote:
>
> take the address of the first element, add with
>
> y*elementsize*ywith+x*elementsize
>
> and you get the address of the element you want.
>
> in your example elementsize is 2 (a word) and ywith
> is 8
> remember to count the first row as row 0
>
> y*2*8+x*2
>
> //Olle
>
> Ben Rodgers wrote:
> >
> > I have a quick question. How would I get a value
> from
> > something like this
> >
> > map:
> > ; |
> > ; V
> > dc.w 1,2,3,4,5,6,4,2
> > dc.w 3,2,4,2,4,1,2,3 <i want that number
> > dc.w 2,4,2,4,1,2,3,2
> >
> >
> > where I want to get the fourth number in the
> second
> > row. Thanks.
> > ===
> > Visit my website, Some Assembly Required, at
> > http://meltingpot.fortunecity.com/gilford/908
> >
> >
>
_________________________________________________________
> > Do You Yahoo!?
> > Get your free @yahoo.com address at
> http://mail.yahoo.com
>
>
===
Visit my website, Some Assembly Required, at
http://meltingpot.fortunecity.com/gilford/908
_________________________________________________________
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