[REBOL] Interleaving strings -How?
From: webdev:accglobal at: 21-Sep-2000 23:30
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Dear "Fellow Rebol Rousers",
After having read the docs I have not quite figured out how to accomplish the interleaving
of strings.
The short and the long of what I want to do is take latitude and longitude coordinate
pairs and interleave them with each other.
The rational behind this is to place objects that are physically close to each other
in the real world close together in computer memory, which we all know is linear and
not spherical like the earth. The coordinates are in decimal degrees for the sake of
easy manipulation.
The max longitude is 180 degrees while the max latitude is 90.
Ignore the issue of positive/negative values as indications of north/south east/west
locations.
The first segment of the numbers would be interleaved on the basis of the non decimal
portion of their values (1st three positions assuming required zero padding).
The balance of the values would be interleaved on each subsequent pair.
As an example:
latitude value : 043.6732452849
longitude value: 142.8321724625
interleaved value: 043142 6783 3221 4572 2846 4925
(spaces are only for readability/illustration)
The non decimal portion must be padded with a zero for all latitude values (they never
exceed 90).
For longitude the non decimal portion must be padded with zero if the value is <100.
I understand that I must convert the numbers to rebol strings to access the necessary
functionality required to step through the "number" and pluck out the required portion.
My problem:
At bare minimum I need to understand the command syntax for stepping and clipping the
string at specific points as well as the method for specifying the length of the clipped
portion.
Any inspiration would be most appreciated.
Thanks in advance,
[webdev--accglobal--net]
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<DIV><FONT face=Arial size=2>Dear "Fellow Rebol Rousers",</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>After having read the docs I have not quite figured
out how to accomplish the interleaving of strings.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>The short and the long of what I want to do is take
latitude and longitude coordinate pairs and interleave them with each
other.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>The rational behind this is to place objects that
are physically close to each other in the real world close together in computer
memory, which we all know is linear and not spherical like the earth.
</FONT><FONT face=Arial size=2>The coordinates are in decimal degrees for the
sake of easy manipulation.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>The max longitude is 180 degrees while the max
latitude is 90.<BR>Ignore the issue of positive/negative values as indications
of north/south east/west locations.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>The first segment of the numbers would be
interleaved on the basis of the non decimal portion of their values (1st three
positions assuming required zero padding).<BR>The balance of the values would be
interleaved on each subsequent pair.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>As an example:</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>latitude value :
043.6732452849<BR>longitude value: 142.8321724625</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>interleaved value: 043142 6783 3221 4572 2846
4925<BR>(spaces are only for readability/illustration)</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>The non decimal portion must be padded with a zero
for all latitude values (they never exceed 90).<BR>For longitude the non decimal
portion must be padded with zero if the value is <100.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>I understand that I must convert the numbers to
rebol strings to access the necessary functionality required to step through the
number
and pluck out the required portion.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>My problem:</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>At bare minimum I need to understand the command
syntax for stepping and clipping the string at specific points as well as the
method for specifying the length of the clipped portion.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2><BR>Any inspiration would be most
appreciated.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Thanks in advance,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2><A
href="mailto:
[webdev--accglobal--net]">
[webdev--accglobal--net]</A></FONT></DIV
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